SMCP-672061FV-15SB - Atmel Corporation

Rev. 4144F–AERO–06/02

Features

•First-in First-out Dual Port Memory

•16384 bits x 9 Organization

•Fast Flag and Access Times: 15, 30 ns

•Wide Temperature Range: -55°C to +125°C

•Programmable Half Full Flag

•Fully Expandable by Word Width or Depth

•Asynchronous Read/Write Operations

•Empty, Full and Half Flags in Single Device Mode

•Retransmit Capability

•Bi-directional Applications

•Battery Back-up Operation: 2V Data Retention

•TTL Compatible

•Single 5V + 10% Power Supply

•QML Q and V with SMD 5962-93177

Description

The M672061F implements a first-in first-out algorithm, featuring asynchronous

read/write operations. The FULL and EMPTY flags prevent data overflow and under-

flow. The Expansion logic allows unlimited expansion in word size and depth with no

timing penalties. Twin address pointers automatically generate internal read and write

addresses, and no external address information are required for the Atmel FIFOs.

Address pointers are automatically incremented with the write pin and read pin. The 9

bits wide data are used in data communications applications where a parity bit for

error checking is necessary. The Retransmit pin resets the Read pointer to zero with-

out affecting the write pointer. This is very useful for retransmitting data when an error

is detected in the system.

Using an array of eight transistors (8T) memory cell, the M672061F combines an

extremely low standby supply current (typ = 0.1 µA) with a fast access time at 15 ns

over the full temperature range. All versions offer battery backup data retention capa-

bility with a typical power consumption at less than 2 µW.

For military/space applications that demand superior levels of performance and reli-

ability the M672061F is processed according to the methods of the latest revision of

the MIL PRF 38535 (Q and V) or ESA SCC 9000.

Rad. Tolerant

High Speed

16 Kb x 9

Parallel FIFO with

Programmable

Flag

M672061F

2M672061F 4144F–AERO–06/02

Block Diagram

Pin Configuration

DIL ceramic 28-pin 300 mils

FP 28-pin 400 mils

M672061F

4144F–AERO–06/02

Pin Description

Data In (I0-I

8)Data inputs for 9-bit data

Reset (RS) Reset occurs whenever the Reset (RS) input is taken to a low state. Reset returns both

internal read and write pointers to the first location. A reset is required after power-up

before a write operation can be enabled. Both the Read Enable (R) and Write Enable

(W) inputs must be in the high state during the period shown in Figure 2 (i.e. tRSS before

the rising edge of RS) and should not change until tRSR after the rising edge of RS.

Otherwise, pulse write (or read) low during the reset operation loads the Programmable

Half Full Flag register from the data Inputs I0 - I8 (or data outputs Q0 - Q8) (shown in fig-

ure 2). In these two cases the Full Flag and the Programmable Half Full Flag are

resetedtohighandtheEmptyFlagtolow.

Figure 1. Reset (no write to Programmable Half Full Flag register)

Notes: 1. EF,FFand HF may change status during reset, but flags will be valid at tRSC.

2. W and R = VIH around the rising edge of RS.

Pin Name Description

I0 - 8 Inputs

Q0 - 8 Outputs

W Write Enable

R Read Enable

RS Reset

EF Empty Flag

FF Full Flag

XO/HF Expansion Out/Half-Full Flag

XI Expansion IN

FL/RT First Load/Retransmit

VCC Power Supply

GND Ground

4M672061F 4144F–AERO–06/02

Figure 2. Reset (write (read) to Programmable Half Full Flag register)

Write Enable (W)A write cycle is initiated on the falling edge of this input if the Full Flag (FF)isnotset.

Data set-up and hold times must be maintained in the rise time of the leading edge of

the Write Enable (W). Data is stored sequentially in the Ram array, regardless of any

current read operation.

Once half the memory is filled, and during the falling edge of the next write operation,

the Half-Full Flag (HF) will be set to low and remain in this state until the difference

between the write and read pointers is less than or equal to half of the total available

memory in the device. The Half-Full Flag (HF) is then reset by the rising edge of the

read operation.

To prevent data overflow, the Full Flag (FF) will go low, inhibiting further write opera-

tions. On completion of a valid read operation, the Full Flag (FF) will go high after TRFF,

allowing a valid write to begin. When the FIFO stack is full, the internal write pointer is

blocked from W, so that external changes to W will have no effect on the full FIFO stack.

Read Enable (R)A read cycle is initiated on the falling edge of the Read Enable (R) provided that the

Empty Flag (EF) is not set. The data is accessed on a first in/first out basis, not including

any current write operations. After Read Enable (R) goes high, the Data Outputs

(Q0 - Q8) will return to a high impedance state until the next Read operation. When all

the data in the FIFO stack has been read, the Empty Flag (EF) will go low, allowing the

“final” read cycle, but inhibiting further read operations while the data outputs remain in

a high impedance state. Once a valid write operation has been completed, the Empty

Flag (EF) will go high after tWEF and a valid read may then be initiated. When the FIFO

stack is empty, the internal read pointer is blocked from R, so that external changes to R

will have no effect on the empty FIFO stack.

First Load/Retransmit

(FL/RT) This is a dual-purpose input. In the Depth Expansion Mode, this pin is connected to

ground to indicate that it is the first loaded (see Operating Modes). In the Single Device

Mode, this pin acts as the retransmit input. The Single Device Mode is initiated by con-

necting the Expansion In (XI) to ground.

The M672061F can be set to retransmit data when the Retransmit Enable Control (RT)

input is pulsed low. A retransmit operation will set the internal read point to the first loca-

tion and will not affect the write pointer. Read Enable (R) and Write Enable (W)mustbe

in the high state during retransmit. The retransmit feature is intended for use when a

number of writes are equal to or less than the depth of the FIFO has occured since the

last RS cycle. The retransmit feature is not compatible with the Depth Expansion Mode

and will affect the Half-Full Flag (HF), in accordance with the relative locations of the

read and write pointers.

M672061F

4144F–AERO–06/02

ExpansionIn(XI)This input is a dual-purpose pin. Expansion In (XI) is connected to GND to indicate an

operation in the single device mode. Expansion In (XI) is connected to Expansion Out

(XO) of the previous device in the Depth Expansion or Daisy Chain modes.

Full Flag (FF)TheFullFlag(FF) will go low, inhibiting further write operations when the write pointer is

one location less than the read pointer, indicating that the device is full. If the read

pointer is not moved after Reset (RS), the Full Flag (FF) will go low after 16384 writes.

Empty Flag (EF)The Empty Flag (EF) will go low, inhibiting further read operations when the read pointer

is equal to the write pointer, indicating that the device is empty.

Expansion Out/Half-full

Flag (XO/HF) This is a dual-purpose output. In the single device mode, when Expansion In (XI) is con-

nected to ground, this output acts as an indication of a half-full memory.

The M672061F offers a variable offset for the Half Full condition. The offset is loaded

into a register during a reset cycle. When RS is low, the Programmable Half Full Flag

(PHF) can be loaded from the DATA inputs I0-I

8by pulsing W low or from the DATA

outputs Q0-Q

8by pulsing R low. The offset options are listed in table 1. If PHF is not

loaded during the reset cycle, the default offset will be the half of the total memory of the

device.

The Programmable Half-Full Flag (PHF) will be set to low and will remain set until the

difference between the write and read pointers is less than or equal to the Programma-

ble offset (if the Half Full Flag register has been loaded during the reset cycle) or the half

of the total memory (if the Half Full register has not been loaded during the reset cycle).

After half the memory is filled and on the falling edge of the next write operation, the

Half-Full Flag (HF) will be set to low and will remain set until the difference between the

write and read pointers is less than or equal to half of the total memory of the device.

The Half-Full Flag (HF) is then reset by the rising edge of the read operation.

In the Depth Expansion Mode, Expansion In (XI) is connected to Expansion Out (XO)of

the previous device. This output acts as a signal to the next device in the Daisy Chain by

providing a pulse to the next device when the previous device reaches the last memory

location.

Data Output (Q0-Q

8)DATA output for 9-bit wide data. This data is in a high impedance condition whenever

Read (R) is in a high state.

6M672061F 4144F–AERO–06/02

Functional Description

Single Device Mode A single M672061F may be used when the application requirements are for 16384

words or less. The M672061F isin a Single Device Configuration when the ExpansionIn (XI)

control input is grounded (see Figure 3). In this mode the Half-Full Flag (HF),whichisanactive

low output, is shared with Expansion Out (XO).

Figure 3. Block Diagram of Single 16384 ×9

Width Expansion Mode Word width may be increased simply by connecting the corresponding input control sig-

nals of multiple devices. Status flags (EF,FFand HF) can be detected from any device.

Figure 4 demonstrates an 18-bit word width by using two M672061F. Any word width can be

attained by adding additional M672061F.

Figure 4. Block Diagram of 16384 bits x 18 FIFO Memory Used in Width Expansion Mode

Note: Flag detection is accomplished by monitoring the FF,EFand the HF signals on either (any) device used in the width expansion

configuration. Do not connect any output control signals together.

(HALF-FULL FLAG)

WRITE (W)(R) READ

DATAIN

(I) DATAOUT

(Q)

FULL FLAG

RESET

(FF)

(RS)

EMPTY FLAG

RETRANSMIT

(EF)

(RT)

EXPANSIONIN(XI)

M672061F

4144F–AERO–06/02

Note: 1. Pointer will increment if flag is high.

Note: 1. XI is connected to XO of previous device.

See Figure 5.

Table 1. Programmable Half Full Flag Offset

I8I7I6I5I4I3I2I1I0Offset

000000000 0

000000001 32

000000010 64

...

100000000 8192 (Half Full)

Default Offset

...

111111110 16384-64

111111111 16384-32

Table 2. Reset and Retransmit Single Device Configuration/Width Expansion Mode

Mode

Inputs Internal Status Outputs

RS RT XI Read Pointer Write Pointer EF FF HF

Reset 0 X 0 Location Zero Location Zero 0 1 1

Retransmit 1 0 0 Location Zero Unchanged X X X

Read/Write 1 1 0 Increment(1) Increment(1) XXX

Table 3. Reset and First Load Truth Table

Depth Expansion/Compound Expansion Mode

Mode

Inputs Internal Status Outputs

RS FL XI Read Pointer Write Pointer EF FF

Reset First Device 0 0 (1) Location Zero Location Zero 0 1

Reset All Other Devices 0 1 (1) Location Zero Location Zero 0 1

Read/Write 1 X (1) XX XX

8M672061F 4144F–AERO–06/02

Depth Expansion (Daisy

Chain) Mode The M672061F can be easily adapted for applications which require more than 16384

words. Figure 5 demonstrates Depth Expansion using three M672061F. Any depth can

be achieved by adding additional 672061F.

The M672061F operates in the Depth Expansion configuration if the following conditions

are met:

1. The first device must be designated by connecting the First Load (FL) control

input to ground.

2. All other devices must have FL in the high state.

3. The Expansion Out (XO) pin of each device must be connected to the Expansion In

(XI) pin of the next device. See Figure 5.

4. External logic is needed to generate a composite Full Flag (FF) and Empty Flag

(EF). This requires that all EF’s and all FFsbe ORed (i.e. all mustbe setto generate the

correct composite FF or EF). See Figure 5.

5. The Retransmit (RT) function and Half-Full Flag (HF) are not available in the Depth

Expansion Mode.

Compound Expansion

Module It is quite simple to apply the two expansion techniques described above together to cre-

ate large FIFO arrays (see Figure 6).

Bidirectional Mode Applications which require data buffering between two systems (each system being

capable of Read and Write operations) can be created by coupling M672061F as shown

in Figure 7 Care must be taken to ensure that the appropriate flag is monitored by each

system (i.e. FF is monitored on the device on which W is in use; EF is monitored on the device

on which R is in use). Both Depth Expansion and Width Expansion may be used in this mode.

Data Flow – Through

Modes Two types of flow-through modes are permitted: a read flow-through and a write flow-

through mode. In the read flow-through mode (Figure 18) the FIFO stack allows a single

word to be read after one word has been written to an empty FIFO stack. The data is

enabled on the bus at (tWEF + tA) ns after the leading edge of W which is known as the

first write edge and remains on the bus until theR line is raised from low to high, after which the

bus will go into a three-state mode after tRHZ ns. The EF line will show a pulse indicating tem-

porary resetand then will be set. In the interval in which R is low, more words may be written to

the FIFO stack (the subsequent writes after the first write edge will reset the Empty Flag) ; how-

ever, the same word (written on the first write edge) presented to the output bus as the read

pointer will not be incremented if R is low. On toggling R, the remaining words written to the

FIFO will appear on the output bus in accordance with the read cycle timings.

In the write flow-through mode (Figure 19), the FIFO stack allows a single word of data

to be written immediately after a single word of data has been read from a full FIFO

stack. The R line causes the FF to be reset, but the W line, being low, causes it to be set again

in anticipation of a new data word. The new word is loaded into the FIFO stack on the leading

edge of W.TheWline must be toggled when FF is not set in order to write new data into the

FIFO stack and to increment the write pointer.

M672061F

4144F–AERO–06/02

Figure 5. Block Diagram of 49152 x 9 FIFO Memory (Depth Expansion)

Figure 6. Compound FIFO Expansion

Notes: 1. For depth expansion block see section on Depth Expansion and Figure 4.

2. For Flag detection see section on Width Expansion and Figure 3

Figure 7. Bidirectional FIFO Mode

10 M672061F 4144F–AERO–06/02

Electrical Characteristics

Absolute Maximum Ratings

DC Parameters

Notes: 1. Icc measurements are made with outputs open.

2. R =W=RS=FL/RT=VIH.

3. All input = Vcc

Notes: 1. 0.4 ≤Vin ≤Vcc.

2. R = VIH, 0.4 ≤VOUT ≤VCC.

3. VIH max = Vcc + 0.3V. VIL min = -0.3V or -1V pulse width 50 ns. For XI input, VIH= 2.8V

4. Vcc min, IOL = 8 mA, IOH = -2 mA

5. Guaranteed but not tested.

Supply voltage (VCC - GND):............................. -0.5V to 7.0V

Input or Output voltage applied: ...(GND -0.3V) to (Vcc +0.3V)

Storage temperature:.................................... -65 °Cto+150°C

*NOTICE: Stresses beyond those listed under "Absolute Maxi-

mum Ratings” may cause permanent damage to the

device. This is a stress rating only and functional oper-

ation of the device at these or any other conditions

beyond those indicated in the operational sections of

this specification is not implied. Exposure to absolute

maximum rating conditions for extended periods may

affect device reliability.

Table 4. DC Test Conditions

TA = -55°C to +125°C; Vss = 0V; Vcc = 4.5V to 5.5V

Parameter Description M672061F-30 M672061F-15 Unit Value

ICCOP (1) Operating supply current 110 120 mA Max

ICCSB(2) Standby supply current 5 5 mA Max

ICCPD(3) Power down current 400 400 µAMax

Parameter Description M672061f Unit Value

ILI(1) Input leakage current ±1µAMax

ILO(2) Output leakage current ±1µAMax

VIL(3) Input low voltage 0.8 V Max

VIH(3) Input high voltage 2.2 V Min

VOL(4) Output low voltage 0.4 V Max

VOH(4) Output high voltage 2.4 V Min

CIN

(5) Input capacitance 8 pF Max

COUT

(5) Output capacitance 8 pF Max

M672061F

4144F–AERO–06/02

AC Parameters

AC Test Conditions Input pulse levels: Gnd to 3.0V

Input rise/Fall times: 5 ns

Input timing reference levels: 1.5V

Output reference levels: 1.5V

Output load: See Figure 8

Figure 8. Output Load

Note: 1. Includes jig and scope capacitance.

(1)

Table 5. AC Test Conditions

Symbol (1) Symbol (2) Parameter (3) (4) M672061F- 30 M672061F- 15 Unit

Min Max Min Max

Read Cycle

TRLRL tRC Read cycle time 40 - 25 - ns

TRLQV tA Access time - 30 - 15 ns

TRHRL tRR Read recovery time 10 - 10 - ns

TRLRH tRPW Read pulse width(5) 30 - 15 - ns

TRLQX tRLZ Read low to data low Z(6) 5-0-ns

TWHQX tWLZ WritelowtodatalowZ(6) (7) 5-3-ns

TRHQX tDV Data valid from read high 5 - 5 - ns

TRHQZ tRHZ Read high to data high Z (6) - 20 - 15 ns

Write Cycle

TWLWL tWC Write cycle time 40 - 25 - ns

TWLWH tWPW Write pulse width(5) 30 - 15 - ns

TWHWL tWR Write recovery time 10 - 10 - ns

TDVWH tDS Data set-up time 18 - 9 - ns

TWHDX tDH Data hold time 0 - 0 - ns

Reset Cycle

TRSLWL tRSC Reset cycle time 40 - 25 - ns

TRSLRSH tRS Reset pulse width (5) 30 - 15 - ns

TWHRSH tRSS Reset set-up time 30 - 20 - ns

12 M672061F 4144F–AERO–06/02

TRSHWL tRSR Reset recovery time 10 – 10 – ns

Retransmit Cycle

TRTLWL tRTC Retransmit cycle time 40 – 25 – ns

TRTLRTH tRT Retransmit pulse width(5) 30–15–ns

TWHRTH tRTS Retransmit set-up time(6) 30–15–ns

TRTHWL tRTR Retransmit recovery time 10 – 10 – ns

Flags

TRSLEFL tEFL Reset to EF low – 30 – 25 ns

TRSLFFH tHFH, tFFH Reset to HF/FF high – 30 – 25 ns

TRLEFL tREF Read low to EF low – 30 – 15 ns

TRHFFH tRFF Read high to FF high – 30 – 25 ns

TEFHRH tRPE Read width after EF high 30 – 15 – ns

TWHEFH tWEF Write high to EF high – 30 – 15 ns

TWLFFL tWFF Write low to FF low – 30 – 20 ns

TWLHFL tWHF Write low to HF low – 30 – 30 ns

TRHHFH tRHF Read high to HF high – 30 – 30 ns

TFFHWH tWPF Write width after FF high 30 – 15 – ns

Expansion

TWLXOL tXOL Read/Write to XO low – 30 – 15 ns

TWHXOH tXOH Read/Write to XO high – 30 – 15 ns

TXILXIH tXI XI pulse width 30 – 15 – ns

TXIHXIL tXIR XI recovery time 10 – 10 – ns

TXILRL tXIS XI set-up time 10 – 10 – ns

1. STD symbol.

2. ALT symbol.

3. Timings referenced as in ac test conditions.

4. All parameters tested only.

5. Pulse widths less than minimum value are not allowed.

6. Values guaranteed by design, not currently tested.

7. Only applies to read data flow-through mode.

Table 5. AC Test Conditions (Continued)

Symbol (1) Symbol (2) Parameter (3) (4) M672061F- 30 M672061F- 15 Unit

Min Max Min Max

M672061F

4144F–AERO–06/02

Figure 9. Asynchronous Write and Read Operation

Figure 10. Full Flag from Last Write to First Read

Figure 11. Empty Flag from Last Read to First Write

14 M672061F 4144F–AERO–06/02

Figure 12. Retransmit

Note: 1. EF,FFand PHF may change status during Retransmit, but flags will be valid at tRTC

Figure 13. Empty Flag Timing

Figure 14. Full Flag Timing

tWEF

tRPE

M672061F

4144F–AERO–06/02

Figure 15. Programmable Half-Full Flag Timing

Figure 16. Expansion Out

Figure 17. Expansion In

16 M672061F 4144F–AERO–06/02

Figure 18. Read Data Flow - Through Mode

Figure 19. Write Data Flow - Through Mode

M672061F

4144F–AERO–06/02

Ordering Information

Note: 1. Contact Atmel for availability.

Reference Number Temperature Range Speed Package Quality Flow

MMCP-672061FV-15-E(1) 25°C 15 ns SB28.3 Engineering Samples

MMCP-672061FV-15 -55 to +125°C 15 ns SB28.3 Mil.

MMCP-672061FV-30 -55 to +125°C 30 ns SB28.3 Mil.

SMCP-672061FV-15SB -55 to +125°C 15 ns SB28.3 SCC B

SMCP-672061FV-30SB -55 to +125°C 30 ns SB28.3 SCC B

5962-9317706QTC -55 to +125°C 15 ns SB28.3 QML Q

5962-9317705QTC -55 to +125°C 30 ns SB28.3 QML Q

5962-9317706VTC -55 to +125°C 15 ns SB28.3 QML V

5962-9317705VTC -55 to +125°C 30 ns SB28.3 QML V

MMDP-672061FV-15-E 25°C 15 ns FP28.4 Engineering Samples

MMDP-672061FV-15 -55 to +125°C15ns FP28.4 Mil.

MMDP-672061FV-30 -55 to +125°C30ns FP28.4 Mil.

SMDP-672061FV-15SB -55 to +125°C15ns FP28.4 SCCB

SMDP-672061FV-30SB -55 to +125°C30ns FP28.4 SCCB

5962-9317706QNC -55 to +125°C15ns FP28.4 QMLQ

5962-9317705QNC -55 to +125°C30ns FP28.4 QMLQ

5962-9317706VNC -55 to +125°C15ns FP28.4 QMLV

5962-9317705VNC -55 to +125°C30ns FP28.4 QMLV

MM0-672061FV-15-E 25°C 15 ns Die Engineering Samples

5962-9317706Q9A -55 to +125°C15ns Die QMLQ

5962-9317706V9A -55 to +125°C15ns Die QMLV

18 M672061F 4144F–AERO–06/02

Package Drawings

28-lead Side Braze (300 mils)

M672061F

4144F–AERO–06/02

Package Drawings

28-lead Flat Pack (400 mils)

Printedonrecycledpaper.

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4144F–AERO–06/02 /xM