A278308
Preliminary 256K X 8 OTP CMOS EPROM
PRELIMINARY (December, 1998, Version 2.0) AMIC Technology, Inc.
Document Title
256K X 8 OTP CMOS EPROM
Revision History
Rev. No. History Issue Date Remark
0.0 Initial issue January 20, 1998 Preliminary
1.0 Add 120 ns specification March 05, 1998
1.1 Modify 32-pin TSOP package L symbol dimensions June 22, 1998
2.0 Erase 55/120 ns specifications December 4, 1998
Change program verify mode VCC from 6.25V to VCC
Change 32-pin TSOP(I) package type to 32-pin PLCC
A278308
Preliminary 256K X 8 OTP CMOS EPROM
PRELIMINARY (December, 1998, Version 2.0) 1AMIC Technology, Inc.
Features
n262,144 X 8 bit organization
nProgramming voltage: 12.75V
nAccess time: 70 ns (max.)
nCurrent: Operating: 30mA (max.) at 5MHz
Standby: 100µA (max.)
nAll inputs and outputs are directly TTL-compatible
n Available in 32-pin DIP and 32-pin PLCC packages
General Description
The A278308 chip is a high-performance 2,097,152 bit
one-time programmable read only memory (OTP
EPROM) organized as 256K by 8 bits. The A278308
requires only 5V power supply in normal read mode
operation and any input signals are TTL levels. The
A278308 is available in industry standard 32 pin dual-in-
line and 32 pin PLCC packages.
Pin Configurations
n DIP n PLCC
VPP
A16
A15
A12
A7
A6
A5
A4
A3
A2
I/O
0
I/O
1
I/O
3
I/O
4
I/O
5
A11
A9
A13
VCC
A10
A278308
1
2
3
4
5
6
7
8
9
10
11
12
13
14 19
20
21
22
23
24
25
26
27
28
29
30
31
32
A8
I/O
2
GND
I/O
6
I/O
7
CE
A14
1815
16 17
A1
A0
OE
PGM
A17
A278308L
A7
A9
I/O
7
CE
A6
A5
A4
A3
A2
A1
A0
I/O
0
A8
A13
A14
A12
A15
A16
VPP
VCC
A17
I/O1
I/O2
GND
I/O4
I/O5
I/O6
1
2
3
4
5
6
7
8
9
10
11
12
13
32
31
30
14
16
15
17
18
19
20
21
22
23
24
25
26
27
28
29
A11
OE
A10
I/O3
PGM
A278308
PRELIMINARY (December, 1998, Version 2.0) 2AMIC Technology, Inc.
Pin Configurations
Pin Name Function
A0-A17 Address Inputs
I/O7-I/O0Data Inputs / Outputs
CE
Chip Enable
OE
Output Enable
PGM
Program Strobe
VPP Program Power Supply
VCC Power Supply
GND Ground
Operating Modes and Truth Table
Mode
CE
OE
PGM
A0 A1 A9 VPP VCC I/O7-I/O0
Read VIL VIL X X X X VCC VCC Data Out
Output Disable VIL VIH X X X X VCC VCC Hi-Z
Standby VIH X X X X X VCC VCC Hi-Z
Program VIL VIH VIL Pulse XXX12.75V 6.25V Data In
Program Verify VIL VIL VIH XXX12.75V VCC Data Out
Program Inhibit VIH X X X X X 12.75V 6.25V Hi-Z
Manufacturer Code(3) VIL VIL VIH VIL VIL VID VCC VCC 37H
Device Code(3) VIL VIL VIH VIH VIL VID VCC VCC 61H
Continuation Code(3) VIL VIL VIH VIL VIH VID VCC VCC 7FH
Notes:
1. X = Either VIH or VIL.
2. VID = 12V ± 0.5V.
3. A2 ~ A8 = A10 ~ A17 = VIL (For auto identification)
A278308
PRELIMINARY (December, 1998, Version 2.0) 3AMIC Technology, Inc.
Functional Description
Read Mode
The A278308 has two control functions, both of which
must be logically active in order to obtain data at the
outputs. CE is the power control and should be used for
device selection. OE is the output control and should be
used to data to the output pins, which is independent of
device selection. Assuming that addresses are stable,
address access time (tACC) is equal to the delay from CE
to output (tCE). Data is available at the output after a
delay (tOE) from the falling edge of OE , as long as CE
has been low and the addresses have been stable for at
least tACC - tOE.
Standby Mode
The A278308 has a standby mode which reduces the
active current from 30mA to 100µA. The A278308 is
placed in the standby mode by applying a CMOS high
signal to CE . When in the standby mode, the output are
in a high impedance state, independent of the OE .
Auto Identify Mode
The auto identify mode allows the reading out of a binary
code from a EPROM that will identify its manufacturer
and type. This mode is intended for use by programming
equipment for the purpose of automatically matching the
device to be programmed with its corresponding
programming algorithm.
To activate the mode, the programming equipment must
apply 12.0V ± 0.5V on address line A9 of the A278308.
Three identification code can be read from data output pin
by toggling A0 and A1. The other addresses must be held
at VIL during this mode. Byte 0 (with A0 at VIL, A1 at VIL)
represents the manufacturer code which is 37H. Byte 1
and Byte 2 represent the device code and continuation
code, which is 61H and 7FH respectively. All identifiers for
these codes will possess odd parity, with MSB (IO7)
defined the parity bit.
Absolute Maximum Ratings*
Ambient Operating Temperature (TA) . . . . -10°C to +85°C
Storage Temperature Plastic Package (TSTG) . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55°C to 125°C
Applied Input Voltage (VI):
All Pins Except A9, VPP and VCC . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . -0.6V to VCC + 0.6V
A9, VPP . . . . . . . . . . . . . . . . . . . . . . . . -0.6V to 13.5V
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.6V to 7.0V
Output Voltage (VO) . . . . . . . . . . . . -0.6V to 7.0V (Note 1)
*Comments
Stresses above those listed under "Absolute Maximum
Ratings" may cause permanent damage to this device.
These are stress ratings only. Functional operation of
this device at these or any other conditions above those
indicated in the operational sections of this specification
is not implied or intended. Exposure to the absolute
maximum rating conditions for extended periods may
affect device reliability.
Notes:
1. During voltage transitions, the input may undershoot GND to -2.0V for periods less than 20 ns. Maximum DC voltage on
input and I/O may overshoot to VCC + 2.0V for periods less than 20 ns.
2. When transitions, A9 and VPP may undershoot GND to -2.0V for periods less than 20 ns. Maximum DC input voltage
on A9 and VPP is +13.5V which may overshoot to 14.0V for period less than 20 ns.
A278308
PRELIMINARY (December, 1998, Version 2.0) 4AMIC Technology, Inc.
Read Mode DC Electrical Characteristics (Ta = 0°C to 70°C, VCC = 5V ± 10%, VPP = VCC)
Symbol Parameter Min. Max. Unit Conditions
VOH Output High Voltage 2.4 VIOH = -400µA
VOL Output Low Voltage 0.4 VIOL = 2.1mA
VIH Input High Voltage 2.0 VCC + 0.5 V
VIL Input Low Voltage -0.5 0.8 V
ILI Input Leakage Current -1 +1 µAVCC = max.
Vin = 0V to VCC
ILO Output Leakage Current -1 +1 µAVCC = max.
Vout = 0V to VCC
ICC VCC Read Operating Current 30 mA VCC = max.
CE = VIL, OE = VIL
Iout = 0mA, at 5MHz
ISB VCC Standby Current (TTL) 1mA VCC = max. CE = VIH
ISB1 VCC Standby Current (CMOS) 100 µAVCC = max.
CE = VCC - 0.2V
IPP VPP Current During Read 10 µACE = OE = VIL,
VPP = VCC
IID A9 Auto Select Current 100 µAA9 = VID, VCC = max.
Capacitance (TA = 25°C, f = 1.0MHz)
Symbol Parameter Min. Max. Unit Conditions
CIN Input Capacitance 8pF VIN = 0V
COut Output Capacitance 8pF VOut = 0V
* These parameters are sampled and not 100% tested.
A278308
PRELIMINARY (December, 1998, Version 2.0) 5AMIC Technology, Inc.
Read Mode AC Characteristics (Ta = 0°C to 70°C, VCC = 5V ± 10%, VPP = VCC)
Symbol Parameter 70ns Unit
Min. Max.
tCYC Cycle Time 70 ns
tAA Address Access Time 70 ns
tCE Chip Enable Access Time 70 ns
tOE Output Enable Access Time 40 ns
tOH Output Hold after Address, CE or OE , whichever Occurred First 0ns
tHZ Output High Z Delay 30 ns
Read Mode Switching Waveforms
t
OH
t
HZ
High-Z
t
AA
t
OE
t
CE
Valid
Output
Address Valid
ADDRESS
CE
OE
OUTPUT
t
CYC
A278308
PRELIMINARY (December, 1998, Version 2.0) 6AMIC Technology, Inc.
AC Measurement Conditions
for 70 ns • Input Rise and Fall Times ≤ 10 ns
‚ Input Pulse Voltage: 0.4V to 2.4Volt
ƒ Input and Output Timing Ref. Voltage: 0.8V to 2.0Volt
2.4V
0.4V
2.0V 2.0V
TEST
POINTS
INPUT OUTPUT
0.8V0.8V
AC Testing Load Circuit
C
L
= 30pF or 100pF
OUT
3.3K
Ω
1N914
1.3V
DEVICE
UNDER
TEST
C
L
= 30pF for 55 ns
C
L
= 100pF for 70/120 ns
C
L
includes JIG capacitance
A278308
PRELIMINARY (December, 1998, Version 2.0) 7AMIC Technology, Inc.
Programming and Program Verify
The programming flowchart is shown in Page 10.
The A278308 is shipped with all bits being set to "1".
Programming causes relevant bits to be changed to "0".
The programming mode is started by setting VCC to
+6.25V and VPP to +12.75V, while CE and PGM are at
VIL, and OE is at VIH. Data to be programmed can be
directly input in the 8 bit format through the data bus.
The write programming algorithm reduces programming
time by using 100µs pulse followed by a byte verification
to determine whether the byte has been successfully
programmed. If the data does not pass the verification,
an additional pulse programming is applied for a
maximum of 25 pulses. On completion of 1 byte
programming and, The verified address is incremented.
After the final address is completed, all bytes are verified
again with VCC = 5.0 Volt.
Program Inhibit
This mode is used to program one of multiple A278308
whose OE , PGM, VPP, VCC, address bus and data
bus are connected in parallel. When programming is
performed, other A278308 can be inhibited from being
programmed by setting their CE pins to VIH.
Programming Mode DC Characteristics (Ta = 0°C to 70°C, VCC = 6.25V ± 0.25V, VPP = 12.75V ± 0.25V)
Symbol Parameter Min. Max. Unit Test Conditions
VOH Output High Voltage 2.4 VIOH = -400µA
VOL Output Low Voltage 0.4 VIOL = 2.1mA
VIH Input High Voltage 2.0 VCC + 0.5 V
VIL Input Low Voltage -0.5 0.8 V
ILI Input Leakage Current -1 +1 µAVCC = max. Vin = 0V to VCC
ICC VCC Current During Program 50 mA
IPP VPP Current During Program 50 mA CE = VIL
VID A9 Auto Select Voltage 11.5 12.5 VA9 = VID
VCC1 Programming Supply Voltage 6.0 6.5 V
VPP1 Programming Voltage 12.5 13 V
Note: VCC must be applied simultaneously or before VPP and removed simultaneously or after VPP.
A278308
PRELIMINARY (December, 1998, Version 2.0) 8AMIC Technology, Inc.
Programming Mode AC Characteristics (Ta = 0°C to 70°C, VCC= 6.25V ± 0.25V, VPP = 12.75V ± 0.25V)
Symbol Parameter Min. Max. Unit
tAS Address Valid to Program Low 2µs
tDS Input Valid to Program Low 2µs
tVPS VPP High to Program Low 2µs
tVCS VCC High to Program Low 2µs
tCES CE Low to Program Low 2µs
tPW Program Pulse Width 95 105 µs
tDH Program High to Input transition 2µs
tOES Input Transition to OE Low 2µs
tOE OE Low to Output Valid 100 ns
tOHZ OE High to Output Hi-Z 130 ns
tAH OE High to Address Transition 0ns
A278308
PRELIMINARY (December, 1998, Version 2.0) 9AMIC Technology, Inc.
Programming and Verify Mode AC Waveforms
t
OES
t
PW
t
CES
t
VCS
t
VPS
t
DS
t
AS
PROGRAM PROGRAM VERIFY
VALID
DATA IN DATA OUT
t
DH
t
OE
t
OHZ
t
AH
ADDRESS
DATA
VPP
VCC
CE
PGM
OE
V
IH
V
IL
V
IH
V
IH
VCC
VCC1
VCC
VPP1
V
IL
V
IH
V
IL
V
IL
A278308
PRELIMINARY (December, 1998, Version 2.0) 10 AMIC Technology, Inc.
Programming Flowchart
START
ADDRESS=FIRST LOCATION
VCC=6.25V
VPP=12.75V
X = 0
PROGRAM ONE 100µs PULSE
INCREMENT X
X = 25?
VERIFY BYTE
LAST ADDRESS
VCC=VPP=5.0V
VERIFY ALL
BYTES ?
DEVICE PASSED
DEVICE FAILED
INCREMENT ADDRESS
FAIL
NO
YES
NO
PASS
YES
FAIL
PASS
VERIFY BYTE
PASS
FAIL
VERIFY
SECTION
INTERACTIVE
SECTION
A278308
PRELIMINARY (December, 1998, Version 2.0) 11 AMIC Technology, Inc.
Ordering Information
Part No. Access Time (ns) Operating Current
Max. (mA) at 5MHz Standby Current
Max. (µA)Package
A278308-70 70 30 100 32Pin DIP
A278308L-70 70 30 100 32Pin PLCC
A278308
PRELIMINARY (December, 1998, Version 2.0) 12 AMIC Technology, Inc.
Package Information
P-DIP 32L Outline Dimensions unit: inches/mm
1
32
E
A2
AL
E
1
E
A
D
C
θ
B
1
B
A1
Base Plane
Seating Plane
16
17
e
Dimensions in inches Dimensions in mm
Symbol Min Nom Max Min Nom Max
A- - 0.210 - - 5.334
A10.015 - - 0.381 - -
A20.149 0.154 0.159 3.785 3.912 4.039
B-0.018 - - 0.457 -
B1-0.050 - - 1.270 -
C-0.010 - - 0.254 -
D1.645 1.650 1.655 41.783 41.91 42.037
E0.537 0.542 0.547 13.64 13.767 13.894
E10.590 0.600 0.610 14.986 15.240 15.494
EA0.630 0.650 0.670 16.002 16.510 17.018
e-0.100 - - 2.540 -
L0.120 0.130 0.140 3.048 3.302 3.556
θ0°-15°0°-15°
Notes:
1. The maximum value of dimension D includes end flash.
2. Dimension E does not include resin fins.
A278308
PRELIMINARY (December, 1998, Version 2.0) 13 AMIC Technology, Inc.
Package Information
PLCC 32L Outline Dimension unit: inches/mm
A1A2
A
e
D
y
H
D
D
13
G
D
b
1
b
G
E
c
5
14
20
21 29
30
32
1
4
E
HE
L
θ
Dimensions in inches Dimensions in mm
Symbol Min Nom Max Min Nom Max
A- - 0.134 - - 3.40
A10.0185 - - 0.47 - -
A20.105 0.110 0.115 2.67 2.80 2.93
b10.026 0.028 0.032 0.66 0.71 0.81
b0.016 0.018 0.021 0.41 0.46 0.54
C0.008 0.010 0.014 0.20 0.254 0.35
D0.547 0.550 0.553 13.89 13.97 14.05
E0.447 0.450 0.453 11.35 11.43 11.51
e0.044 0.050 0.056 1.12 1.27 1.42
GD0.490 0.510 0.530 12.45 12.95 13.46
GE0.390 0.410 0.430 9.91 10.41 10.92
HD0.585 0.590 0.595 14.86 14.99 15.11
HE0.485 0.490 0.495 12.32 12.45 12.57
L0.075 0.090 0.095 1.91 2.29 2.41
y- - 0.003 - - 0.075
θ0°-10°0°-10°
Notes:
1. Dimensions D and E do not include resin fins.
2. Dimensions GD & GE are for PC Board surface mount pad pitch
design reference only.
