1816250000.0 - WEIDMULLER - Datasheet.Live

IS42/45SM/RM/VM16800H

www.issi.com - DRAM@issi.com

Rev. A | November 2015

2M x 16Bits x 4Banks Mobile Synchronous DRAM

Description

These IS42/45SM/RM/VM16800H are mobile 134,217,728 bits CMOS Synchronous DRAM organized as 4 banks of 2,097,152 words x 16

bits. These products are offering fully synchronous operation and are referenced to a positive edge of the clock. All inputs and outputs

are synchronized with the rising edge of the clock input. The data paths are internally pipelined to achieve high bandwidth. All input

and output voltage levels are compatible with LVCMOS.

 JEDEC standard 3.3V, 2.5V, 1.8V power supply

• Auto refresh and self refresh

• All pins are compatible with LVCMOS interface

• 4K refresh cycle / 64ms

• Programmable Burst Length and Burst Type

• 1, 2, 4, 8 or Full Page for Sequential Burst

• 4 or 8 for Interleave Burst

• Programmable CAS Latency : 2,3 clocks

•All inputs and outputs referenced to the positive edge of the

system clock

• Data mask function by DQM

• Internal 4 banks operation

• Burst Read Single Write operation

• Special Function Support

• PASR(Partial Array Self Refresh)

• Auto TCSR(Temperature Compensated Self Refresh)

• Programmable Driver Strength Control

• Full Strength or 1/2, 1/4, of Full Strength

• Deep Power Down Mode

• Automatic precharge, includes CONCURRENT Auto Precharge

Mode and controlled Precharge

Features

products at any time without notice. ISSI assumes no liability arising out of the application or use of any information, products or services

described herein. Customers are advised to obtain the latest version of this device specification before relying on any published information

and before placing orders for products.

Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or

malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or

effectiveness. Products are not authorized for use in such applications unless Integrated Silicon Solution, Inc. receives written assurance to

its satisfaction, that:

a.) the risk of injury or damage has been minimized;

b.) the user assume all such risks; and

c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Figure1: 54Ball FBGA Ball Assignment

[Top View]

1 2 3 4 5 6 7 8 9

VSS DQ15 VSSQ

DQ14 DQ13 VDDQ

DQ12 DQ11 VSSQ

DQ10 DQ9 VDDQ

UDQM CLK CKE

NC A11 A9

A8 A7 A6

VSS A5 A4

VDDQ DQ0 VDD

VSSQ DQ2 DQ1

VDDQ DQ4 DQ3

VSSQ DQ6 DQ5

/CAS /RAS /WE

BA0 BA1 /CS

A0 A1 A10

A3 A2 VDD

DQ8 NC VSS VDD LDQM DQ7

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Table2: Pin Descriptions

Pin Pin Name Descriptions

CLK System Clock The system clock input. All other inputs are registered to the

SDRAM on the rising edge CLK.

CKE Clock Enable

Controls internal clock signal and when deactivated, the SDRAM

will be one of the states among power down, suspend or self

refresh.

/CS Chip Select Enable or disable all inputs except CLK, CKE and DQM.

BA0~BA1 Bank Address Selects bank to be activated during RAS activity.

Selects bank to be read/written during CAS activity.

A0~A11 Address

Row Address : RA0~RA11

Column Address : CA0~CA8

Auto Precharge : A10

/RAS, /CAS, /WE

Row Address Strobe,

Column Address Strobe,

Write Enable

RAS, CAS and WE define the operation.

Refer function truth table for details.

LDQM,UDQM Data Input/Output Mask Controls output buffers in read mode and masks input data in

write mode.

DQ0~DQ15 Data Input/Output Data input/output pin.

VDD/VSS Power Supply/Ground Power supply for internal circuits and input buffers.

VDDQ/VSSQ Data Output Power/Ground Power supply for output buffers.

NC No Connection No connection.

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

BANK D

ROW DECODER

BANK C

ROW DECODER

TCSR

PASR

Figure2: Functional Block Diagram

CONTROL LOGIC

COMMAND DECODER

COLUMN

ADDRESS

BUFFER &

BURST

COUNTER

CLOCK

GENERATOR

CLK

CKE

ROW

ADDRESS

BUFFER &

REFRESH

COUNTER

/CS

/RAS

/CAS

/WE

MODE

BANK B

ROW DECODER

BANK A

ROW DECODER

SENSE AMPLIFIER

COLUMN DECODER

& LATCH CIRCUIT

DQM

ADDRESS

DATA CONTROL CIRCUIT

LATCH CIRCUIT

INPUT & OUTPUT

BUFFER

EXTENDED

MODE

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Automatic Sequence

Manual Input

Figure3: Simplified State Diagram

CKE 

CKE

IDLE

ROW

ACTIVE

SELF

REFRESH

CBR

REFRESH

POWER

DOWN

ACTIVE

POWER

DOWN

READ WRITE

READ A WRITE A

PRE-

CHARGE

READ

SUSPEND

READ A

SUSPEND

WRITE

SUSPEND

WRITE A

SUSPEND

POWER

MODE

SET

PRECHARGE

CKE 

CKE

CKE 

CKE

CKE 

CKE

READ

WRITE

CKE 

CKE

READ

WRITE

PRE

ACT

REF

MRS

EXTENDED

MODE

SET

DEEP

POWER

DOWN

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Burst Type

Accesses within a given burst may be programmed to be either sequential or interleaved; this is referred to as the burst type and is

selected via bit M3. The ordering of accesses within a burst is determined by the burst length, the burst type and the starting column

address, as shown in Table 3.

Table 3: Burst Definition

M9 Write Burst Mode

0 Burst Read and Burst Write

1 Burst Read and Single Write

M3 Burst Type

0 Sequential

1 Interleave

M6 M5 M4 CAS Latency

0 0 0 Reserved

0 0 1 Reserved

0 1 0 2

0 1 1 3

1 0 0 Reserved

1 0 1 Reserved

1 1 0 Reserved

1 1 1 Reserved

M2 M1 M0 Burst Length

M3 = 0 M3 = 1

0 0 0 1 1

0 0 1 2 2

0 1 0 4 4

0 1 1 8 8

1 0 0 Reserved Reserved

1 0 1 Reserved Reserved

1 1 0 Reserved Reserved

1 1 1 Full Page Reserved

Burst

Length

Starting Column

Address

Order of Access Within a Burst

Sequential Interleaved

A2 A1 A0

2 0 0-1 0-1

1 1-0 1-0

0 0 0-1-2-3 0-1-2-3

0 1 1-2-3-0 1-0-3-2

1 0 2-3-0-1 2-3-0-1

1 1 3-0-1-2 3-2-1-0

0 0 0 0-1-2-3-4-5-6-7 0-1-2-3-4-5-6-7

0 0 1 1-2-3-4-5-6-7-0 1-0-3-2-5-4-7-6

0 1 0 2-3-4-5-6-7-0-1 2-3-0-1-6-7-4-5

0 1 1 3-4-5-6-7-0-1-2 3-2-1-0-7-6-5-4

1 0 0 4-5-6-7-0-1-2-3 4-5-6-7-0-1-2-3

1 0 1 5-6-7-0-1-2-3-4 5-4-7-6-1-0-3-2

1 1 0 6-7-0-1-2-3-4-5 6-7-4-5-2-3-0-1

1 1 1 7-0-1-2-3-4-5-6 7-6-5-4-3-2-1-0

Full

Page

n=A0-8

(Location 0-511)

Cn, Cn+1. Cn+2,

Cn+3, Cn+4…

…Cn-1, Cn...

Not Supported

Note :

1. For full-page accesses: y = 512

2. For a burst length of two, A1-A8 select the block-

of-two burst; A0 selects the starting column within the

block.

3. For a burst length of four, A2-A8 select the block-

of-four burst; A0-A1 select the starting column within

the block.

4. For a burst length of eight, A3-A8 select the

block-of-eight burst; A0-A2 select the starting column

within the block.

5. For a full-page burst, the full row is selected and A0-A8

select the starting column.

6. Whenever a boundary of the block is reached within a

given sequence above, the following access wraps

within the block.

7. For a burst length of one, A0-A8 select the unique

column to be accessed, and mode register bit M3 is

ignored.

0 CAS Latency BT Burst Length

Address Bus

0 1 2 3 4 5 6 10 9 8 7 11

A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11

Mode Register (Mx)

0 0

Figure4: Mode Register Definition

Note: M13(BA1) and M12 (BA0) must be set to “0” to select Mode Register (vs. the Extended Mode Register)

BA0

BA1

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Figure5: Extended Mode Register

0 PASR

Address Bus

Extended Mode Register (Ex)

0 1 2 3 4 5 6 10 9 8 7 11

A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11

E2 E1 E0 Self Refresh Coverage

0 0 0 All Banks

0 0 1 Two Banks (BA1=0)

0 1 0 One Bank (BA1=BA0=0)

0 1 1 Reserved

1 0 0 Reserved

1 0 1 Half of One Bank (BA1=BA0=0, Row Address MSB=0)

1 1 0 Quarter of One Bank (BA1=BA0=0, Row Address 2 MSB=0)

1 1 1 Reserved

Note: E13(BA1) must be set to “1” and E12(BA0) must be set to “0” to select Extended Mode Register (vs. the base Mode

E6 E5 Driver Strength

0 0 Full Strength

0 1 1/2 Strength

1 0 1/4 Strength

1 1 Reserved

0 0 0 0 DS

BA0

BA1

1 0

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

In general, this 128Mb SDRAM (2M x 16Bits x 4banks) is a multi-bank DRAM that operates at 3.3V/2.5V/1.8V and includes a

synchronous interface (all signals are registered on the positive edge of the clock signal, CLK). Each of the 33,554,432-bit banks is

organized as 4,096 rows by 512 columns by 16-bits

Read and write accesses to the SDRAM are burst oriented; accesses start at a selected location and continue for a programmed

number of locations in a programmed sequence. Accesses begin with the registration of an ACTIVE command, which is then followed

by a READ or WRITE command. The address bits registered coincident with the ACTIVE command are used to select the bank and

row to be accessed (BA0-BA1 select the bank, A0-A11 select the row). The address bits (BA0-BA1 select the bank, A0-A8 select the

column) registered coincident with the READ or WRITE command are used to select the starting column location for the burst access.

Prior to normal operation, the SDRAM must be initialized. The following sections provide detailed information covering device

initialization, register definition, command descriptions and device operation.

Power up and Initialization

SDRAMs must be powered up and initialized in a predefined manner. Operational procedures other than those specified may result in

undefined operation. Once power is applied to VDD and VDDQ(simultaneously) and the clock is stable(stable clock is defined as a

signal cycling within timing constraints specified for the clock pin), the SDRAM requires a 100µs delay prior to issuing any command

other than a COMMAND INHIBIT or NOP. CKE must be held high during the entire initialization period until the PRECHARGE command

has been issued. Starting at some point during this 100µs period and continuing at least through the end of this period, COMMAND

INHIBIT or NOP commands should be applied.

Once the 100µs delay has been satisfied with at least one COMMAND INHIBIT or NOP command having been applied, a PRECHARGE

command should be applied. All banks must then be precharged, thereby placing the device in the all banks idle state.

Once in the idle state, two AUTO REFRESH cycles must be performed. After the AUTO REFRESH cycles are complete, the SDRAM is

ready for mode register programming. Because the mode register will power up in an unknown state, it should be loaded prior to

applying any operational command. And a extended mode register set command will be issued to program specific mode of self

refresh operation(PASR). The following these cycles, the Mobile SDRAM is ready for normal operation.

Mode Register

The mode register is used to define the specific mode of operation of the SDRAM. This definition includes the selection of a burst

length, a burst type, a CAS latency, an operating mode and a write burst mode. The mode register is programmed via the LOAD

MODE REGISTER command and will retain the stored information until it is programmed again or the device loses power.

Mode register bits M0-M2 specify the burst length, M3 specifies the type of burst (sequential or interleaved), M4-M6 specify the CAS

latency, M7 and M8 specify the operating mode, M9 specifies the write burst mode, and M10-M11 should be set to zero. M12 and M13

should be set to zero to prevent extended mode register.

The mode register must be loaded when all banks are idle, and the controller must wait the specified time before initiating the

subsequent operation. Violating either of these requirements will result in unspecified operation.

Functional Description

Extended Mode Register

The Extended Mode Register controls the functions beyond those controlled by the Mode Register. These additional functions are

special features of the mobile DRAM device. They include Partial Array Self Refresh (PASR) and Driver Strength (DS).

The Extended Mode Register is programmed via the Mode Register Set command and retains the stored information until it is

programmed again or the device loses power.

The Extended Mode Register must be programmed with E7 through E11 set to “0”. Also, E12(BA0) must be set to “0”, and E13(BA1)

must be set to “1”. The Extended Mode Register must be loaded when all banks are idle and no bursts are in progress, and the

controller must wait the specified time before initiating any subsequent operation. Violating either of these requirements results in

unspecified operation.

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Burst Length

Read and write accesses to the SDRAM are burst oriented, with the burst length being programmable, as shown in Figure 1. The burst

length determines the maximum number of column locations that can be accessed for a given READ or WRITE command. Burst

lengths of 1, 2, 4 or 8 locations are available for both the sequential and the interleaved burst types, and a full-page burst is available

for the sequential type. The full-page burst is used in conjunction with the BURST TERMINATE command to generate arbitrary burst

lengths.

Reserved states should not be used, as unknown operation or incompatibility with future versions may result. When a READ or WRITE

command is issued, a block of columns equal to the burst length is effectively selected. All accesses for that burst take place within

this block, meaning that the burst will wrap within the block if a boundary is reached. The block is uniquely selected by A1-A8 when

the burst length is set to two; by A2-A8 when the burst length is set to four; and by A3-A8 when the burst length is set to eight. The

remaining (least significant) address bit(s) is (are) used to select the starting location within the block. Full-page bursts wrap within

the page if the boundary is reached.

Bank(Row) Active

The Bank Active command is used to activate a row in a specified bank of the device. This command is initiated by activating CS, RAS and

deasserting CAS, WE at the positive edge of the clock. The value on the BA0-BA1 selects the bank, and the value on the A0-A11 selects

the row.

This row remains active for column access until a precharge command is issued to that bank. Read and write operations can only be

initiated on this activated bank after the minimum tRCD time is passed from the activate command.

Read

The READ command is used to initiate the burst read of data. This command is initiated by activating CS, CAS, and deasserting WE, RAS at

the positive edge of the clock. BA0-BA1 input select the bank, A0-A8 address inputs select the starting column location. The value on input

A10 determines whether or not Auto Precharge is used. If Auto Precharge is selected the row being accessed will be precharged at the

end of the READ burst; if Auto Precharge is not selected, the row will remain active for subsequent accesses. The length of burst and the

CAS latency will be determined by the values programmed during the MRS command.

Write

The WRITE command is used to initiate the burst write of data. This command is initiated by activating CS, CAS, WE and deasserting RAS

at the positive edge of the clock. BA0-BA1 input select the bank, A0-A8 address inputs select the starting column location. The value on

input A10 determines whether or not Auto Precharge is used. If Auto Precharge is selected the row being accessed will be precharged at

the end of the WRITE burst; if Auto Precharge is not selected, the row will remain active for subsequent accesses.

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

CAS Latency

The CAS latency is the delay, in clock cycles, between the registration of a READ command and the availability of the first piece of

output data. The latency can be set to two or three clocks. If a READ command is registered at clock edge n, and the latency is

clocks, the data will be available by clock edge

n +

m. The DQs will start driving as a result of the clock edge one cycle earlier

(n + m

1), and provided that the relevant access times are met, the data will be valid by clock edge

n +

m. For example, assuming that the

clock cycle time is such that all relevant access times are met, if a READ command is registered at T0 and the latency is programmed to

two clocks, the DQs will start driving after T1 and the data will be valid by T2, as shown in Figure 6. Reserved states should not be used

as unknown operation or incompatibility with future versions may result.

Operating Mode

The normal operating mode is selected by setting M7 and M8 to zero; the other combinations of values for M7 and M8 are reserved

for future use and/or test modes. The programmed burst length applies to both READ and WRITE bursts. Test modes and reserved

states should not be used because unknown operation or incompatibility with future versions may result.

Write Burst Mode

When M9 = 0, the burst length programmed via M0-M2 applies to both READ and WRITE bursts; when M9 = 1, the programmed

burst length applies to READ bursts, but write accesses are single-location (nonburst) accesses.

CLK

COMMAND

NOP NOP

Dout

T0 T1 T2

tLZ tOH

tAC

CAS Latency=2

READ

CLK

COMMAND

NOP NOP

Dout

T0 T1 T2

tLZ tOH

tAC

CAS Latency=3

NOP

READ

DON’T CARE

UNDEFINED

Figure6: CAS Latency

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Table4: Command Truth Table

Function CKEn-1 CKEn /CS /RAS /CAS /WE DQM ADDR A10 Note

Device Deselect (NOP) H X H X X X X X

No Operation (NOP) H X L H H H X X

Mode Register Set H X L L L L X OP CODE 4

Extended Mode Register Set H X L L L L X OP CODE 4

Active (select bank and

activate row) H X L L H H X Bank/Row

Read H X L H L H L/H Bank/Col L 5

Read with Autoprecharge H X L H L H L/H Bank/Col H 5

Write H X L H L L L/H Bank/Col L 5

Write with Autoprecharge H X L H L L L/H Bank/Col H 5

Precharge All Banks H X L L H L X X H

Precharge Selected Bank H X L L H L X Bank L

Burst Stop H H L H H L X X

Auto Refresh H H L L L H X X 3

Self Refresh Entry H L L L L H X X 3

Self Refresh Exit L H

H X X X

X X 2

L H H H

Precharge Power Down Entry H L

H X X X

X X

L H H H

Precharge Down Exit L H

H X X X

X X

L H H H

Clock Suspend Entry H L

H X X X

X X

L V V V

Clock Suspend Exit L H X X X

Deep Power Down Entry H L L H H L X X 6

Deep Power Down Exit L H X X X

Note :

1. CKEn is the logic state of CKE at clock edge n; CKEn-1 was the state of CKE at the previous clock edge.

H: High Level, L: Low Level, X: Don't Care, V: Valid

2. Exiting Self Refresh occurs by asynchronously bringing CKE from low to high and will put the device in the all banks idle state once

tXSR is met. Command Inhibit or NOP commands should be issued on any clock edges occuring during the tXSR period. A minimum

of two NOP commands must be provided during tXSR period.

3. During refresh operation, internal refresh counter controls row addressing; all inputs and I/Os are “Don’t Care” except for CKE.

4. A0-A11 define OP CODE written to the mode register, and BA must be issued 0 in the mode register set, and 1 in the extended

mode register set.

5. DQM “L” means the data Write/Ouput Enable and “H” means the Write inhibit/Output High-Z. Write DQM Latency is 0 CLK and Read

DQM Latency is 2 CLK.

6. Standard SDRAM parts assign this command sequence as Burst Terminate. For Bat Ram parts, the Burst Terminate command is

assigned to the Deep Power Down function.

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Table5: Function Truth Table

Current

State

Command

Action Note

/CS /RAS /CAS /WE BA A0-A11 Description

Idle

L L L L OP CODE Mode Register Set Set the Mode Register 14

L L L H X X Auto or Self Refresh Start Auto or Self

Refresh 5

L L H L BA X Precharge No Operation

L L H H BA Row Add. Bank Activate Activate the Specified

Bank and Row

L H L L BA Col Add./ A10 Write/WriteAP ILLEGAL 4

L H L H BA Col Add./ A10 Read/ReadAP ILLEGAL 4

L H H H X X No Operation No Operation or Power

Down 3

H X X X X X Device Deselect No Operation or Power

Down 3

L H H L X X Burst Stop No Operation or Power

Down 3

Row

Active

L L L L OP CODE Mode Register Set ILLEGAL 13,14

L L L H X X Auto or Self Refresh ILLEGAL 13

L L H L BA X Precharge Precharge 7

L L H H BA Row Add. Bank Activate ILLEGAL 4

L H L L BA Col Add./A10 Write/Write AP Start Write : Optional

AP(A10=H) 6

L H L H BA Col Add./A10 Read/Read AP Start Read : Optional

AP(A10=H) 6

L H H H X X No Operation No Operation

H X X X X X Device Deselect No Operation

L H H L X X Burst Stop No Operation

Read

L L L L OP CODE Mode Register Set ILLEGAL 13,14

L L L H X X Auto or Self Refresh ILLEGAL 13

L L H L BA X Precharge Termination Burst :

Start the Precharge

L L H H BA Row Add. Bank Activate ILLEGAL 4

L H L L BA Col Add./A10 Write/WriteAP Termination Burst :

Start Write(AP) 8,9

L H L H BA Col Add./A10 Read/Read AP Terimination Burst :

Start Read(AP) 8

L H H H X X No Operation Continue the Burst

H X X X X X Device Deselect Continue the Burst

L H H L X X Burst Stop Burst Stop, Row Active

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Table5: Function Truth Table

Current

State

Command

Action Note

/CS /RAS /CAS /WE BA A0-A11 Description

Write

L L L L OP CODE Mode Register Set ILLEGAL 13,14

L L L H X X Auto or Self Refresh ILLEGAL 13

L L H L BA X Precharge Termination Burst :

Start the Precharge 10

L L H H BA Row Add. Bank Activate ILLEGAL 4

L H L L BA Col Add./A10 Write/WriteAP Termination Burst :

Start Write(AP) 8

L H L H BA Col Add./A10 Read/ReadAP Terimination Burst :

Start READ(AP) 8,9

L H H H X X No Operation Continue the Burst

H X X X X X Device Deselect Continue the Burst

L H H L X X Burst Stop Burst Stop, Row Active

Read

with

Auto

Precharge

L L L L OP CODE Mode Register Set ILLEGAL 13,14

L L L H X X Auto or Self Refresh ILLEGAL 13

L L H L BA X Precharge ILLEGAL 4,12

L L H H BA Row Add. Bank Activate ILLEGAL 4,12

L H L L BA Col Add./A10 Write/WriteAP ILLEGAL 12

L H L H BA Col Add./A10 Read/ReadAP ILLEGAL 12

L H H H X X No Operation Continue the Burst

H X X X X X Device Deselect Continue the Burst

L H H L X X Burst Stop ILLEGAL 13

Write

with

Auto

Precharge

L L L L OP CODE Mode Register Set ILLEGAL 13,14

L L L H X X Auto or Self Refresh ILLEGAL 13

L L H L BA X Precharge ILLEGAL 4,12

L L H H BA Row Add. Bank Activate ILLEGAL 4,12

L H L L BA Col Add./A10 Write/WriteAP ILLEGAL 12

L H L H BA Col Add./A10 Read/ReadAP ILLEGAL 12

L H H H X X No Operation Continue the Burst

H X X X X X Device Deselect Continue the Burst

L H H L X X Burst Stop ILLEGAL 13

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Table5: Function Truth Table

Current

State

Command

Action Note

/CS /RAS /CAS /WE BA A0-A11 Description

Precharging

L L L L OP CODE Mode Register Set ILLEGAL 13,14

L L L H X X Auto or Self Refresh ILLEGAL 13

L L H L BA X Precharge No Operation : Bank(s)

Idle after tRP

L L H H BA Row Add. Bank Activate ILLEGAL 4,12

L H L L BA Col Add./ A10 Write/WriteAP ILLEGAL 4,12

L H L H BA Col Add./ A10 Read/ReadAP ILLEGAL 4,12

L H H H X X No Operation No Operation : Bank(s)

Idle after tRP

H X X X X X Device Deselect No Operation : Bank(s)

Idle after tRP

L H H L X X Burst Stop No Operation : Bank(s)

Idle after tRP

Row

Activating

L L L L OP CODE Mode Register Set ILLEGAL 13,14

L L L H X X Auto or Self Refresh ILLEGAL 13

L L H L BA X Precharge ILLEGAL 4,12

L L H H BA Row Add. Bank Activate ILLEGAL 4,11,12

L H L L BA Col Add./A10 Write/Write AP ILLEGAL 4,12

L H L H BA Col Add./A10 Read/Read AP ILLEGAL 4,12

L H H H X X No Operation No Operation : Row

Active after tRCD

H X X X X X Device Deselect No Operation : Row

Active after tRCD

L H H L X X Burst Stop No Operation : Row

Active after tRCD

Write

Recovering

L L L L OP CODE Mode Register Set ILLEGAL 13,14

L L L H X X Auto or Self Refresh ILLEGAL 13

L L H L BA X Precharge ILLEGAL 4,13

L L H H BA Row Add. Bank Activate ILLEGAL 4,12

L H L L BA Col Add./A10 Write/WriteAP Start Write : Optional

AP(A10=H)

L H L H BA Col Add./A10 Read/Read AP Start Write : Optional

AP(A10=H) 9

L H H H X X No Operation No Operation : Row

Active after tDPL

H X X X X X Device Deselect No Operation : Row

Active after tDPL

L H H L X X Burst Stop No Operation : Row

Active after tDPL

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Table5: Function Truth Table

Current

State

Command

Action Note

/CS /RAS /CAS /WE BA A0-A11 Description

Write

Recovering

with

Auto

Precharge

L L L L OP CODE Mode Register Set ILLEGAL 13,14

L L L H X X Auto or Self Refresh ILLEGAL 13

L L H L BA X Precharge ILLEGAL 4,13

L L H H BA Row Add. Bank Activate ILLEGAL 4,12

L H L L BA Col Add./ A10 Write/WriteAP ILLEGAL 4,12

L H L H BA Col Add./ A10 Read/ReadAP ILLEGAL 4,9,12

L H H H X X No Operation No Operation :

Precharge after tDPL

H X X X X X Device Deselect No Operation :

Precharge after tDPL

L H H L X X Burst Stop No Operation :

Precharge after tDPL

Refreshing

L L L L OP CODE Mode Register Set ILLEGAL 13,14

L L L H X X Auto or Self Refresh ILLEGAL 13

L L H L BA X Precharge ILLEGAL 13

L L H H BA Row Add. Bank Activate ILLEGAL 13

L H L L BA Col Add./A10 Write/Write AP ILLEGAL 13

L H L H BA Col Add./A10 Read/Read AP ILLEGAL 13

L H H H X X No Operation No Operation : Idle

after tRC

H X X X X X Device Deselect No Operation : Idle

after tRC

L H H L X X Burst Stop No Operation : Idle

after tRC

Mode

Accessing

L L L L OP CODE Mode Register Set ILLEGAL 13,14

L L L H X X Auto or Self Refresh ILLEGAL 13

L L H L BA X Precharge ILLEGAL 13

L L H H BA Row Add. Bank Activate ILLEGAL 13

L H L L BA Col Add./A10 Write/WriteAP ILLEGAL 13

L H L H BA Col Add./A10 Read/Read AP ILLEGAL 13

L H H H X X No Operation No Operation : Idle

after 2 Clock Cycle

H X X X X X Device Deselect No Operation : Idle

after 2 Clock Cycle

L H H L X X Burst Stop ILLEGAL 13

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Note :

1. H: Logic High, L: Logic Low, X: Don't care, BA: Bank Address, AP: Auto Precharge.

2. All entries assume that CKE was active during the preceding clock cycle.

3. If both banks are idle and CKE is inactive, then in power down cycle

4. Illegal to bank in specified states. Function may be legal in the bank indicated by Bank Address,

depending on the state of that bank.

5. If both banks are idle and CKE is inactive, then Self Refresh mode.

6. Illegal if tRCD is not satisfied.

7. Illegal if tRAS is not satisfied.

8. Must satisfy burst interrupt condition.

9. Must satisfy bus contention, bus turn around, and/or write recovery requirements.

10. Must mask preceding data which don't satisfy tDPL.

11. Illegal if tRRD is not satisfied

12. Illegal for single bank, but legal for other banks in multi-bank devices.

13. Illegal for all banks.

14. Mode Register Set and Extended Mode Register Set is same command truth table except BA.

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Table6: CKE Truth Table

Current

State

CKE Command

Action Note

Cycle

Current

Cycle /CS /RAS /CAS /WE BA A0-A11

Self

Refresh

H X X X X X X X INVALID 2

L H H X X X X X Exit Self Refresh with Device

Deselect 3

L H L H H H X X Exit Self Refresh with No

Operation 3

L H L H H L X X ILLEGAL 3

L H L H L X X X ILLEGAL 3

L H L L X X X X ILLEGAL 3

L L X X X X X X Maintain Self Refresh

Power

Down

H X X X X X X X INVALID 2

L H

H X X X X X Power Down Mode Exit, All

Banks Idle 3

L H H H X X

L H L

L X X X X ILLEGAL

X L X X X

X X L X X

L L X X X X X X Maintain Power Down Mode

Deep

Power

Down

H X X X X X X X INVALID 2

L H X X X X X X Deep Power Down Mode Exit 6

L L X X X X X X Maintain Deep Power Down

Mode

All

Banks

Idle

H H H X X X Refer to the Idle State

section of the Current State

Truth Table

H H L H X X 4

H H L L H X 4

H H L L L H X X Auto Refresh

H H L L L L OP CODE Mode Register Set 5

H L H X X X Refer to the Idle State

section of the Current State

Truth Table

H L L H X X 4

H L L L H X 4

H L L L L H X X Entry Self Refresh 5

H L L L L L OP CODE Mode Register Set

L X X X X X X X Power Down 5

Any

State

other

than

listed

above

H H X X X X X X Refer to Operations of the

Current State Truth Table

H L X X X X X X Begin Clock Suspend next

cycle

L H X X X X X X Exit Clock Suspend next

cycle

L L X X X X X X Maintain Clock Suspend

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Note :

1. H: Logic High, L: Logic Low, X: Don't care

2. For the given current state CKE must be low in the previous cycle.

3. When CKE has a low to high transition, the clock and other inputs are re-enabled asynchronously. When exiting power down mode,

a NOP (or Device Deselect) command is required on the first positive edge of clock after CKE goes high.

4. The address inputs depend on the command that is issued.

5. The Precharge Power Down mode, the Self Refresh mode, and the Mode Register Set can only be entered from the all banks idle state.

6. When CKE has a low to high transition, the clock and other inputs are re-enabled asynchronously.

When exiting deep power down mode, a NOP (or Device Deselect) command is required on the first positive edge of clock after CKE goes

high and is maintained for a minimum 100usec.

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Table7A: 3.3V Absolute Maximum Rating

Parameter Symbol Rating Unit

Ambient Temperature (Industrial)

-40 ~ 85

C Ambient Temperature (Automotive, A1) -40 ~ 85

Ambient Temperature (Automotive, A2) -40 ~ 105

Storage Temperature TSTG -55 ~ 150 C

Voltage on Any Pin relative to VSS VIN, VOUT -1.0 ~ 4.6 V

Voltage on VDD relative to VSS VDD, VDDQ -1.0 ~ 4.6 V

Short Circuit Output Current IOS 50 mA

Power Dissipation PD 1 W

Note :

Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress

rating only, and functional operation of the device at these or any other conditions above those indicated in the operational sections of

this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.

Table8A: 3.3V Capacitance (TA=25 C, f=1MHz, VDD= 3.3V)

Parameter Pin Symbol Min Max Unit

Input Capacitance

CLK CI1 2 4 pF

A0~A11, BA0~BA1, CKE, /CS, /RAS,

/CAS, /WE, LDQM, UDQM CI2 2 4 pF

Data Input/Output Capacitance DQ0~DQ15 CIO 3 5 pF

Table9A: 3.3V DC Operating Condition (Voltage referenced to VSS=0V, TA= -40 ~ 105 C)

Note :

1. VDDQ must not exceed the level of VDD

2. VIH(max) = 5.3V AC. The overshoot voltage duration is  3ns.

3. VIL(min) = -2.0V AC. The overshoot voltage duration is  3ns.

4. Any input 0V  VIN  VDDQ.

Input leakage currents include Hi-Z output leakage for all bi-directional buffers with tri-state outputs.

5. DOUT is disabled, 0V  VOUT  VDDQ.

Parameter Symbol Min Typ Max Unit Note

Power Supply Voltage

VDD 2.7 3.3 3.6 V

VDDQ 2.7 3.3 3.6 V 1

Input High Voltage VIH 2.2 - VDDQ+0.3 V 2

Input Low Voltage VIL -0.3 0 0.5 V 3

Output High Voltage VOH 2.4 - - V IOH= -0.1mA

Output Low Voltage VOL - - 0.4 V IOL= +0.1mA

Input Leakage Current ILI -1 - 1 uA 4

Output Leakage Current ILO -1.5 1.5 uA 5

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Table10A: 3.3V AC Operating Condition (TA= -40 ~ 105 C, VDD = 2.7V-3.6V, VSS=0V)

Parameter Symbol Typ Unit

AC Input High/Low Level Voltage VIH / VIL 2.4 / 0.4 V

Input Timing Measurement Reference Level Voltage VTRIP 0.5 x VDDQ V

Input Rise / Fall Time tR / tF 1 / 1 ns

Output Timing Measurement Reference Level Voltage VOUTREF 0.5 x VDDQ V

Output Load Capacitance for Access Time Measurement CL 30 pF

Output

870

1200

VDDQ

30pF

Output

30pF

50

VTT=0.5 x VDDQ

Z0=50

DC Output Load Circuit AC Output Load Circuit

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Table11A: 3.3V DC Characteristic (DC operating conditions unless otherwise noted)

Note :

1. Measured with outputs open.

2. Refresh period is 64ms.

3. Typical value at room temperature.

4. Self Refresh mode and Deep Power Down are not supported for A2 grade with TA > 85°C

Parameter Sym Test Condition

Speed

Unit Note

-6 -75

Operating Current IDD1 Burst Length=1, One Bank Active,

tRC  tRC(min) IOL = 0 mA 50 45 mA 1

Precharge Standby Current

in Power Down Mode

IDD2P CKE  VIL(max), tCK = 10ns 0.3

IDD2PS CKE & CLK  VIL(max), tCK =  0.3

Precharge Standby Current

in Non Power Down Mode

IDD2N

CKE  VIH(min), /CS  VIH(min), tCK = 10ns

Input signals are changed one time during 2

clks.

IDD2NS

CKE  VIH(min), CLK  VIL(max), tCK = 

Input signals are stable. 4

Active Standby Current

in Power Down Mode

IDD3P CKE  VIL(max), tCK = 10ns 1

IDD3PS CKE & CLK  VIL(max), tCK =  1

Active Standby Current

in Non Power Down Mode

IDD3N

CKE  VIH(min), /CS  VIH(min), tCK = 10ns

Input signals are changed one time during 2

clks.

IDD3NS CKE  VIH(min), CLK  VIL(max), tCK = 

Input signals are stable. 15

Burst Mode Operating Current IDD4 tCK>tCK(min), IOL = 0 mA, Page Burst

All Banks Activated, tCCD = 1 clk 60 55 mA 1

Auto Refresh Current (4K Cycle) IDD5 tRC  tRFC(min), All Banks Active 70 mA 2

Self

Refresh

Current

PASR TCSR

IDD6 CKE  0.2V uA

4 banks

85C 300

45C 230

2 Bank

85C 250

45C 200

1 Bank

85C 220

45C 180

Deep Power Down Mode Current IDD7 20 uA 3

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Table7B: 2.5V Absolute Maximum Rating

Parameter Symbol Rating Unit

Ambient Temperature (Industrial)

-40 ~ 85

C Ambient Temperature (Automotive, A1) -40 ~ 85

Ambient Temperature (Automotive, A2) -40 ~ 105

Storage Temperature TSTG -55 ~ 150 C

Voltage on Any Pin relative to VSS VIN, VOUT -1.0 ~ 3.6 V

Voltage on VDD relative to VSS VDD, VDDQ -1.0 ~ 3.6 V

Short Circuit Output Current IOS 50 mA

Power Dissipation PD 1 W

Note :

Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress

rating only, and functional operation of the device at these or any other conditions above those indicated in the operational sections of

this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.

Table8B: 2.5V Capacitance (TA=25 C, f=1MHz, VDD=2.5V)

Parameter Pin Symbol Min Max Unit

Input Capacitance

CLK CI1 2 4 pF

A0~A11, BA0~BA1, CKE, /CS, /RAS,

/CAS, /WE, LDQM, UDQM CI2 2 4 pF

Data Input/Output Capacitance DQ0~DQ15 CIO 3 5 pF

Table9B: 2.5V DC Operating Condition (Voltage referenced to VSS=0V, TA= -40 ~ 105 C)

Parameter Symbol Min Typ Max Unit Note

Power Supply Voltage

VDD 2.3 2.5 3.0 V

VDDQ 2.3 2.5 3.0 V 1

Input High Voltage VIH 0.8 x VDDQ - VDDQ+0.3 V 2

Input Low Voltage VIL -0.3 0 0.3 V 3

Output High Voltage VOH 0.9 x VDDQ - - V IOH= -0.1mA

Output Low Voltage VOL - - 0.2 V IOL= +0.1mA

Input Leakage Current ILI -1 - 1 uA 4

Output Leakage Current ILO -1.5 1.5 uA 5

Note :

1. VDDQ must not exceed the level of VDD

2. VIH(max) = VDDQ+1.5V AC. The overshoot voltage duration is  3ns.

3. VIL(min) = -1.0V AC. The overshoot voltage duration is  3ns.

4. Any input 0V  VIN  VDDQ.

Input leakage currents include Hi-Z output leakage for all bi-directional buffers with tri-state outputs.

5. DOUT is disabled, 0V  VOUT  VDDQ.

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Table10B: 2.5V AC Operating Condition (TA= -40 ~ 105 C, VDD = 2.3V – 3.0V, VSS=0V)

Parameter Symbol Typ Unit

AC Input High/Low Level Voltage VIH / VIL 0.9 x VDDQ / 0.2 V

Input Timing Measurement Reference Level Voltage VTRIP 0.5 x VDDQ V

Input Rise / Fall Time tR / tF 1 / 1 ns

Output Timing Measurement Reference Level Voltage VOUTREF 0.5 x VDDQ V

Output Load Capacitance for Access Time Measurement CL 30 pF

Output

500

VDDQ

30pF

Output

30pF

50

VTT=0.5 x VDDQ

Z0=50

DC Output Load Circuit AC Output Load Circuit

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Table11B: 2.5V DC Characteristic (DC operating conditions unless otherwise noted)

Note :

1. Measured with outputs open.

2. Refresh period is 64ms.

3. Typical value at room temperature.

4. Self Refresh mode and Deep Power Down are not supported for A2 grade with TA > 85°C

Parameter Sym Test Condition

Speed

Unit Note

-6 -75

Operating Current IDD1 Burst Length=1, One Bank Active,

tRC  tRC(min) IOL = 0 mA 50 45 mA 1

Precharge Standby Current

in Power Down Mode

IDD2P CKE  VIL(max), tCK = 10ns 0.3

IDD2PS CKE & CLK  VIL(max), tCK =  0.3

Precharge Standby Current

in Non Power Down Mode

IDD2N

CKE  VIH(min), /CS  VIH(min), tCK = 10ns

Input signals are changed one time during 2

clks.

IDD2NS

CKE  VIH(min), CLK  VIL(max), tCK = 

Input signals are stable. 4

Active Standby Current

in Power Down Mode

IDD3P CKE  VIL(max), tCK = 10ns 1

IDD3PS CKE & CLK  VIL(max), tCK =  1

Active Standby Current

in Non Power Down Mode

IDD3N

CKE  VIH(min), /CS  VIH(min), tCK = 10ns

Input signals are changed one time during 2

clks.

IDD3NS CKE  VIH(min), CLK  VIL(max), tCK = 

Input signals are stable. 15

Burst Mode Operating Current IDD4 tCK>tCK(min), IOL = 0 mA, Page Burst

All Banks Activated, tCCD = 1 clk 60 55 mA 1

Auto Refresh Current (4K Cycle) IDD5 tRC  tRFC(min), All Banks Active 70 mA 2

Self

Refresh

Current

PASR TCSR

IDD6 CKE  0.2V uA

4 banks

85C 300

45C 230

2 Bank

85C 250

45C 200

1 Bank

85C 220

45C 180

Deep Power Down Mode Current IDD7 20 uA 3

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Table7C: 1.8V Absolute Maximum Rating

Parameter Symbol Rating Unit

Ambient Temperature (Industrial)

-40 ~ 85

C Ambient Temperature (Automotive, A1) -40 ~ 85

Ambient Temperature (Automotive, A2) -40 ~ 105

Storage Temperature TSTG -55 ~ 150 C

Voltage on Any Pin relative to VSS VIN, VOUT -1.0 ~ 2.6 V

Voltage on VDD relative to VSS VDD, VDDQ -1.0 ~ 2.6 V

Short Circuit Output Current IOS 50 mA

Power Dissipation PD 1 W

Note :

Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress

rating only, and functional operation of the device at these or any other conditions above those indicated in the operational sections of

this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.

Table8C: 1.8V Capacitance (TA=25 C, f=1MHz, VDD=1.8V)

Parameter Pin Symbol Min Max Unit

Input Capacitance

CLK CI1 2 4 pF

A0~A11, BA0~BA1, CKE, /CS, /RAS,

/CAS, /WE, LDQM, UDQM CI2 2 4 pF

Data Input/Output Capacitance DQ0~DQ15 CIO 3 5 pF

Table9C: 1.8V DC Operating Condition (Voltage referenced to VSS=0V, TA= -40 ~ 105 C)

Parameter Symbol Min Typ Max Unit Note

Power Supply Voltage

VDD 1.7 1.8 1.95 V

VDDQ 1.7 1.8 1.95 V 1

Input High Voltage VIH 0.8 x VDDQ - VDDQ+0.3 V 2

Input Low Voltage VIL -0.3 0 0.3 V 3

Output High Voltage VOH 0.9 x VDDQ - - V IOH= -0.1mA

Output Low Voltage VOL - - 0.2 V IOL= +0.1mA

Input Leakage Current ILI -1 - 1 uA 4

Output Leakage Current ILO -1.5 1.5 uA 5

Note :

1. VDDQ must not exceed the level of VDD

2. VIH(max) = VDDQ+1.5V AC. The overshoot voltage duration is  3ns.

3. VIL(min) = -1.0V AC. The overshoot voltage duration is  3ns.

4. Any input 0V  VIN  VDDQ.

Input leakage currents include Hi-Z output leakage for all bi-directional buffers with tri-state outputs.

5. DOUT is disabled, 0V  VOUT  VDDQ.

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Table10C: 1.8V AC Operating Condition (TA= -40 ~ 105 C, VDD = 1.7V-1.95V, VSS=0V)

Parameter Symbol Typ Unit

AC Input High/Low Level Voltage VIH / VIL 0.9 x VDDQ / 0.2 V

Input Timing Measurement Reference Level Voltage VTRIP 0.5 x VDDQ V

Input Rise / Fall Time tR / tF 1 / 1 ns

Output Timing Measurement Reference Level Voltage VOUTREF 0.5 x VDDQ V

Output Load Capacitance for Access Time Measurement CL 30 pF

Output

500

VDDQ

30pF

Output

30pF

50

VTT=0.5 x VDDQ

Z0=50

DC Output Load Circuit AC Output Load Circuit

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Table11C: 1.8V DC Characteristic (DC operating conditions unless otherwise noted)

Note :

1. Measured with outputs open.

2. Refresh period is 64ms.

3. Typical value at room temperature

4. Self Refresh mode and Deep Power Down are not supported for A2 grade with TA > 85°C

Parameter Sym Test Condition

Speed

Unit Note

-6 -75

Operating Current IDD1 Burst Length=1, One Bank Active,

tRC  tRC(min) IOL = 0 mA 50 45 mA 1

Precharge Standby Current

in Power Down Mode

IDD2P CKE  VIL(max), tCK = 10ns 0.3

IDD2PS CKE & CLK  VIL(max), tCK =  0.3

Precharge Standby Current

in Non Power Down Mode

IDD2N CKE  VIH(min), /CS  VIH(min), tCK = 10ns

Input signals are changed one time during 2 clks. 10

IDD2NS

CKE  VIH(min), CLK  VIL(max), tCK = 

Input signals are stable. 4

Active Standby Current

in Power Down Mode

IDD3P CKE  VIL(max), tCK = 10ns 1

IDD3PS CKE & CLK  VIL(max), tCK =  1

Active Standby Current

in Non Power Down Mode

IDD3N CKE  VIH(min), /CS  VIH(min), tCK = 10ns

Input signals are changed one time during 2 clks. 20

IDD3NS CKE  VIH(min), CLK  VIL(max), tCK = 

Input signals are stable. 10

Burst Mode Operating Current IDD4 tCK>tCK(min), IOL = 0 mA, Page Burst

All Banks Activated, tCCD = 1 clk 60 55 mA 1

Auto Refresh Current (4K Cycle) IDD5 tRC  tRFC(min), All Banks Active 70 mA 2

Self

Refresh

Current

PASR TCSR

IDD6 CKE  0.2V uA

4 banks

85C 300

45C 230

2 Bank

85C 250

45C 200

1 Bank

85C 220

45C 180

Deep Power Down Mode Current IDD7 10 uA 3

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Table12: AC Characteristic (AC operation conditions unless otherwise noted)

Parameter Sym -6 -75 Unit Note

Min Max Min Max

CLK Cycle Time CL = 3 tCK3 6.0 1000 7.5 1000

CL = 2 tCK2 10 10

Access time from CLK (pos. edge) CL = 3 tAC3 5.5 6 2

CL = 2 tAC2 8 8

CLK High-Level Width tCH 2.5 2.5 3

CLK Low-Level Width tCL 2.5 2.5 3

CKE Setup Time tCKS 1.5 2.0

CKE Hold Time tCKH 1.0 1.0

/CS, /RAS, /CAS, /WE, DQM Setup Time tCMS 1.5 2.0

/CS, /RAS, /CAS, /WE, DQM Hold Time tCMH 1.0 1.0

Address Setup Time tAS 1.5 2.0

Address Hold Time tAH 1.0 1.0

Data-In Setup Time tDS 1.5 2.0

Data-In Hold Time tDH 1.0 1.0

Data-Out High-Impedance Time

from CLK (pos.edge)

CL = 3 tHZ3 5.5 6 4

CL = 2 tHZ2 8 8

Data-Out Low-Impedance Time tLZ 1.0 1.0

Data-Out Hold Time (load) tOH 2.5 2.5

Data-Out Hold Time (no load) tOHN 1.8 1.8

ACTIVE to PRECHARGE command tRAS 42 100K 45 100K

PRECHARGE command period tRP 18 19

ACTIVE bank a to ACTIVE bank a command tRC 60 67.5 5

ACTIVE bank a to ACTIVE bank b command tRRD 12 15

ACTIVE to READ or WRITE delay tRCD 18 19

READ/WRITE command to READ/WRITE

command tCCD 1 1 CLK 6

WRITE command to input data delay tDWD 0 0 6

Data-in to PRECHARGE command tDPL 12 15 ns 7

Data-in to ACTIVE command tDAL 30 37.5 7

DQM to data high-impedance during READs tDQZ 2 2

CLK

DQM to data mask during WRITEs tDQM 0 0 6

LOAD MODE REGISTER command to ACTIVE

or REFRESH command tMRD 2 2 8

Data-out to high-impedance from

PRECHARGE command

CL = 3 tROH3 3 3 6

CL = 2 tROH2 2 2

Last data-in to burst STOP command tBDL 1 1 6

Last data-in to new READ/WRITE command tCDL 1 1 6

CKE to clock disable or power-down entry

mode tCKED 1 1

CLK

CKE to clock enable or power-down exit

setup mode tPED 1 1 9

Refresh period (4,096 rows) tREF 64 64 ms

AUTO REFRESH period tRFC 80 80

Exit SELF REFRESH to ACTIVE command tXSR 80 80 5

Transition time tT 0.5 1.2 0.5 1.2

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Note :

1. The clock frequency must remain constant (stable clock is defined as a signal cycling within timing constraints specified for the

clock pin) during access or precharge states (READ, WRITE, including tDPL, and PRECHARGE commands). CKE may be used to

reduce the data rate.

2. tAC at CL = 3 with no load is 5.5ns and is guaranteed by design. Access time to be measured with input signals of 1V/ns edge

rate, from 0.8V to 0.2V. If tR > 1ns, then (tR/2-0.5)ns should be added to the parameter.

3. AC characteristics assume tT = 1ns. If tR & tF > 1ns, then [(tR+tF)/2-1]ns should be added to the parameter.

4. tHZ defines the time at which the output achieves the open circuit condition; it is not a reference to VOH or VOL. The last valid

data element will meet tOH before going High-Z.

5. Parameter guaranteed by design.

6. Required clocks are specified by JEDEC functionality and are not dependent on any timing parameter.

7. Timing actually specified by tDPL plus tRP; clock(s) specified as a reference only at minimum cycle rate

8. JEDEC and PC100 specify three clocks.

9. Timing actually specified by tCKs; clock(s) specified as a reference only at minimum cycle rate.

10. A new command can be given tRC after self refresh exit.

11. The specification in the table for tREF is applicable for all temperature grades with TA ≤ +85°C. Only A2 automotive temperature

grade supports operation with TA > +85°C, and this value must be further constrained with a maximum tREF of 16ms.

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Special Operation for Low Power Consumption

Temperature Compensated Self Refresh

Temperature Compensated Self Refresh allows the controller to program the Refresh interval during SELF REFRESH mode, according to

the case temperature of the Mobile SDRAM device. This allows great power savings during SELF REFRESH during most operating

temperature ranges. Only during extreme temperatures would the controller have to select a TCSR level that will guarantee data during

SELF REFRESH.

Every cell in the DRAM requires refreshing due to the capacitor losing its charge over time. The refresh rate is dependent on

temperature. At higher temperatures a capacitor loses charge quicker than at lower temperatures, requiring the cells to be refreshed

more often. Historically, during Self Refresh, the refresh rate has been set to accommodate the worst case, or highest temperature

range expected.

Thus, during ambient temperatures, the power consumed during refresh was unnecessarily high, because the refresh rate was set to

accommodate the higher temperatures.

This temperature compensated refresh rate will save power when the DRAM is operating at normal temperatures.

Partial Array Self Refresh

For further power savings during SELF REFRESH, the PASR feature allows the controller to select the amount of memory that will be

refreshed during SELF REFRESH. The refresh options are All Banks, Two Banks (bank a and b), One Bank (bank a), Half of One Bank

(1/2 of bank a), or Quarter of One Bank (1/4 of bank a). WRITE and READ commands can still occur during standard operation, but

only the selected banks will be refreshed during SELF REFRESH. Data in banks that are disabled will be lost.

Deep Power Down

Deep Power Down is an operating mode to achieve maximum power reduction by eliminating the power of the whole memory array of

the devices. Data will not be retained once the device enters Deep Power Down Mode.

This mode is entered by having all banks idle then /CS and /WE held low with /RAS and /CAS held high at the rising edge of the clock,

while CKE is low. This mode is exited by asserting CKE high.

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Figure7: Deep Power Down Mode Entry

Figure8: Deep Power Down Mode Exit

/CS

/RAS

/CAS

/WE

CLK

CKE

100 µ s tRP tRFC

Deep Power Down Exit

All Banks Precharge

Auto Refresh Mode Register Set

Extended Mode Register Set

New Command

Auto Refresh

DON’T CARE

CLK

CKE

Precharge if needed Deep Power Down Entry

tRP

/CS

/RAS

/CAS

/WE

DON’T CARE

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Configuration Frequency

(MHz)

Speed

(ns)

Order Part No. Package

8Mx16 166 6 IS42SM16800H-6BLI 54-ball BGA, Lead-free

133 7.5 IS42SM16800H-75BLI 54-ball BGA, Lead-free

133 7.5 IS42SM16800H-75BI 54-ball BGA

Ordering Information – VDD = 3.3V

Industrial Range: (-40oC to +85oC)

Configuration Frequency

(MHz)

Speed

(ns)

Order Part No. Package

8Mx16 166 6 IS42RM16800H-6BLI 54-ball BGA, Lead-free

133 7.5 IS42RM16800H-75BLI 54-ball BGA, Lead-free

133 7.5 IS42RM16800H-75BI 54-ball BGA

Ordering Information – VDD = 2.5V

Industrial Range: (-40oC to +85oC)

Configuration Frequency

(MHz)

Speed

(ns)

Order Part No. Package

8Mx16 166 6 IS42VM16800H-6BLI 54-ball BGA, Lead-free

133 7.5 IS42VM16800H-75BLI 54-ball BGA, Lead-free

133 7.5 IS42VM16800H-75BI 54-ball BGA

Ordering Information – VDD = 1.8V

Industrial Range: (-40oC to +85oC)

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Configuration Frequency

(MHz)

Speed

(ns)

Order Part No. Package

8Mx16 166 6 IS45SM16800H-6BLA1 54-ball BGA, Lead-free

133 7.5 IS45SM16800H-75BLA1 54-ball BGA, Lead-free

Ordering Information – VDD = 3.3V

Automotive (A1) Range: (-40oC to +85oC)

Configuration Frequency

(MHz)

Speed

(ns)

Order Part No. Package

8Mx16 166 6 IS45RM16800H-6BLA1 54-ball BGA, Lead-free

133 7.5 IS45RM16800H-75BLA1 54-ball BGA, Lead-free

Ordering Information – VDD = 2.5V

Automotive (A1) Range: (-40oC to +85oC)

Configuration Frequency

(MHz)

Speed

(ns)

Order Part No. Package

8Mx16 166 6 IS45VM16800H-6BLA1 54-ball BGA, Lead-free

133 7.5 IS45VM16800H-75BLA1 54-ball BGA, Lead-free

Ordering Information – VDD = 1.8V

Automotive (A1) Range: (-40oC to +85oC)

www.issi.com - DRAM@issi.com

Rev. A | November 2015

IS42/45SM/RM/VM16800H

Package Outline 10/17/2007