Datasheet A278308L, A278308 Datasheet (AMIC)

A278308

Preliminary 256K X 8 OTP CMOS EPROM

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

PRELIMINARY (December, 1998, Version 2.0) AMIC Technology, Inc.

A278308

Preliminary 256K X 8 OTP CMOS EPROM

Features

n 262,144 X 8 bit organization
n Programming voltage: 12.75V
n Access time: 70 ns (max.)
n Current: Operating: 30mA (max.) at 5MHz

Standby: 100µA (max.)

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

Pin Configurations

n DIP n PLCC

VPP

A16
A15

A12

I/O
I/O
I/O

GND

1
2
3
4

A7

5

A6

6

A5

7

A4

8

A3

9

A2

10

A1

11

A0

12

0

13

1

14 19

2

16

A278308

VCC

32

31

PGM

30

A17

29

A14
A13

28
27

A8
A9

26

A11

25
24

OE
A10

23
22

CE
I/O

21
20

1815
17

7

I/O

6

I/O

5

I/O

4

I/O

3

n All inputs and outputs are directly TTL-compatible
n Available in 32-pin DIP and 32-pin PLCC packages

operation and any input signals are TTL levels. The
A278308 is available in industry standard 32 pin dual-in­line and 32 pin PLCC packages.

A12

A15

A16

VPP

VCC

A17

PGM

1

2

3

4
A7
A6

A5
A4
A3
A2

A1
A0

I/O

5
6

7
8
9
10

11
12

0

13

141615

I/O1

I/O2

A278308L

GND

32

31

30

29
28
27
26
25
24
23
22
21

17

18

19

20

I/O4

I/O3

I/O6

I/O5

A14
A13
A8
A9
A11

OE
A10

CE
I/O

7

PRELIMINARY (December, 1998, Version 2.0) 1 AMIC Technology, Inc.

Pin Configurations

CE

OE

PGM

CEOEPGM

A278308

Pin Name Function

A0-A17 Address Inputs

I/O7-I/O0 Data Inputs / Outputs

Chip Enable

Output Enable

Program Strobe

VPP Program Power Supply

VCC Power Supply

GND Ground

Operating Modes and Truth Table

Mode

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 X X X 12.75V 6.25V Data In

Program Verify VIL VIL VIH X X X 12.75V VCC Data Out

Program Inhibit VIH X X X X X 12.75V 6.25V Hi-Z

Manufacturer Code

Device Code

Continuation Code

(3)

(3)

(3)

VIL VIL VIH VIL VIL VID VCC VCC 37H

VIL VIL VIH VIH VIL VID VCC VCC 61H

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)

A0 A1 A9 VPP VCC I/O7-I/O0

PRELIMINARY (December, 1998, Version 2.0) 2 AMIC Technology, Inc.

Functional Description

A278308

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 .

Absolute Maximum Ratings*

Ambient Operating Temperature (TA) . . . . -10°C to +85°C

Storage Temperature Plastic Package (T

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -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)

) . . . . . . . . . .

STG

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.

*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.

PRELIMINARY (December, 1998, Version 2.0) 3 AMIC Technology, Inc.

Read Mode DC Electrical Characteristics (Ta = 0°C to 70°C, VCC = 5V ± 10%, VPP = VCC)

Symbol Parameter Min. Max. Unit Conditions

A278308

VOH Output High Voltage 2.4 V

VOL Output Low Voltage 0.4 V IOL = 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

ILO Output Leakage Current -1 +1

ICC VCC Read Operating Current 30 mA

ISB VCC Standby Current (TTL) 1 mA

ISB1 VCC Standby Current (CMOS) 100

IPP VPP Current During Read 10

µA

µA

µA

µA

IOH = -400µA

VCC = max.
Vin = 0V to VCC

VCC = max.
Vout = 0V to VCC

VCC = max.

CE = VIL, OE = VIL

Iout = 0mA, at 5MHz

VCC = max. CE = VIH

VCC = max.

CE = VCC - 0.2V

CE = OE = VIL,

VPP = VCC

IID A9 Auto Select Current 100

µA

A9 = VID, VCC = max.

Capacitance (TA = 25°C, f = 1.0MHz)

Symbol Parameter Min. Max. Unit Conditions

CIN Input Capacitance 8 pF VIN = 0V

COut Output Capacitance 8 pF VOut = 0V

* These parameters are sampled and not 100% tested.

PRELIMINARY (December, 1998, Version 2.0) 4 AMIC Technology, Inc.

Read Mode AC Characteristics (Ta = 0°C to 70°C, VCC = 5V ± 10%, VPP = VCC)

A278308

Symbol Parameter

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

tHZ Output High Z Delay 30 ns

Read Mode Switching Waveforms

ADDRESS

Output Hold after Address, CE or OE , whichever Occurred First

t

CYC

Address Valid

70ns

Min. Max.

0 ns

Unit

CE

OE

OUTPUT

t

CE

t

HZ

t

OE

t

t

AA

Valid

OH

High-Z

Output

PRELIMINARY (December, 1998, Version 2.0) 5 AMIC 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

2.0V 2.0V

0.4V

INPUT OUTPUT

AC Testing Load Circuit

TEST

POINTS

1.3V

1N914

A278308

0.8V0.8V

3.3K

DEVICE

UNDER

TEST

CL = 30pF or 100pF

CL = 30pF for 55 ns
CL = 100pF for 70/120 ns
CL includes JIG capacitance

Ω

OUT

PRELIMINARY (December, 1998, Version 2.0) 6 AMIC Technology, Inc.

A278308

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 V

VOL Output Low Voltage 0.4 V IOL = 2.1mA

VIH Input High Voltage 2.0 VCC + 0.5 V

IOH = -400µA

VIL Input Low Voltage -0.5 0.8 V

ILI Input Leakage Current -1 +1

ICC VCC Current During Program 50 mA

IPP VPP Current During Program 50 mA

VID A9 Auto Select Voltage 11.5 12.5 V A9 = 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.

µA

VCC = max. Vin = 0V to VCC

CE = VIL

PRELIMINARY (December, 1998, Version 2.0) 7 AMIC Technology, Inc.

A278308

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 2

tDS Input Valid to Program Low 2

tVPS VPP High to Program Low 2

tVCS VCC High to Program Low 2

tCES

tPW Program Pulse Width 95 105

tDH Program High to Input transition 2

tOES

tOE

tOHZ

tAH

CE Low to Program Low

Input Transition to OE Low

OE Low to Output Valid

OE High to Output Hi-Z

OE High to Address Transition

2

2

100 ns

130 ns

0 ns

µs

µs

µs

µs

µs

µs

µs

µs

PRELIMINARY (December, 1998, Version 2.0) 8 AMIC Technology, Inc.

Programming and Verify Mode AC Waveforms

A278308

ADDRESS

DATA

VPP

VCC

CE

V

IH

V

IL

VCC

VCC

V

IH

VPP1

VCC1

V

IL

PROGRAM

PROGRAM VERIFY

VALID

t

AS

DATA IN DATA OUT

t

DS

t

VPS

t

VCS

t

DH

t

OE

t

OHZ

t

AH

t

V

PW

IL

t

OES

V

IL

t

CES

V

IH

PGM

V

IH

OE

PRELIMINARY (December, 1998, Version 2.0) 9 AMIC Technology, Inc.

Programming Flowchart

INTERACTIVE

SECTION

A278308

START

ADDRESS=FIRST LOCATION

VCC=6.25V

VPP=12.75V

X = 0

PROGRAM ONE 100µs PULSE

INCREMENT X

VERIFY

SECTION

INCREMENT ADDRESS

FAIL

NO

X = 25?

NO

VERIFY BYTE

PASS

LAST ADDRESS

YES

VCC=VPP=5.0V

VERIFY ALL

BYTES ?

PASS

DEVICE PASSED

FAIL

YES

VERIFY BYTE

DEVICE FAILED

FAIL

PASS

PRELIMINARY (December, 1998, Version 2.0) 10 AMIC Technology, Inc.

Ordering Information

A278308

Part No. Access Time (ns)

A278308-70 70 30 100 32Pin DIP

A278308L-70 70 30 100 32Pin PLCC

Operating Current

Max. (mA) at 5MHz

Standby Current

Max. (µA)

Package

PRELIMINARY (December, 1998, Version 2.0) 11 AMIC Technology, Inc.

A278308

Package Information

P-DIP 32L Outline Dimensions unit: inches/mm

D

32

E

17

1

AL

A2

B

B

1

Symbol

Dimensions in inches Dimensions in mm

16

A1

Base Plane

Seating Plane

e

θ

E

1

C

E

A

Min Nom Max Min Nom Max

A - - 0.210 - - 5.334
A1 0.015 - - 0.381 - ­A2 0.149 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 -

D 1.645 1.650 1.655 41.783 41.91 42.037

E 0.537 0.542 0.547 13.64 13.767 13.894
E1 0.590 0.600 0.610 14.986 15.240 15.494

EA 0.630 0.650 0.670 16.002 16.510 17.018

e - 0.100 - - 2.540 -

L 0.120 0.130 0.140 3.048 3.302 3.556

θ 0°

-

15° 0°

-

15°

Notes:

1. The maximum value of dimension D includes end flash.

2. Dimension E does not include resin fins.

PRELIMINARY (December, 1998, Version 2.0) 12 AMIC Technology, Inc.

A278308

Package Information

PLCC 32L Outline Dimension unit: inches/mm

H

D

D

13

5

e

14

20

21

A

b

b

1

G

D

A1 A2

y

D

4

1

E

HE

32

30

29

θ

Dimensions in inches Dimensions in mm

Symbol

Min Nom Max Min Nom Max

A - - 0.134 - - 3.40
A1 0.0185 - - 0.47 - ­A2 0.105 0.110 0.115 2.67 2.80 2.93

b1 0.026 0.028 0.032 0.66 0.71 0.81

b 0.016 0.018 0.021 0.41 0.46 0.54

C 0.008 0.010 0.014 0.20 0.254 0.35

D 0.547 0.550 0.553 13.89 13.97 14.05

E 0.447 0.450 0.453 11.35 11.43 11.51

e 0.044 0.050 0.056 1.12 1.27 1.42

GD 0.490 0.510 0.530 12.45 12.95 13.46
GE 0.390 0.410 0.430 9.91 10.41 10.92
HD 0.585 0.590 0.595 14.86 14.99 15.11
HE 0.485 0.490 0.495 12.32 12.45 12.57

L 0.075 0.090 0.095 1.91 2.29 2.41

y - - 0.003 - - 0.075

θ 0° - 10° 0° - 10°

c

L

G

E

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.

PRELIMINARY (December, 1998, Version 2.0) 13 AMIC Technology, Inc.