UVEPROM

SMJ27C256

Austin Semiconductor, Inc.

SMJ27C256

Rev. 1.0 9/01

Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.

1

FEATURES

• Organized 32,768 x 8

• Single +5V ±10% power supply

• Pin-compatible with existing 256K ROM’s and

EPROM’s

• All inputs/outputs fully TTL compatible

• Power-saving CMOS technology

• Very high-speed SNAP! Pulse Programming

• 3-state output buffers

• 400-mV DC assured noise immunity with standarad

TTL loads

• Latchup immunity of 250 mA on all input and output

pins

• Low power dissipation (CMOS Input Levels)

PActive - 165mW Worst Case

PStandby - 1.7mW Worst Case (CMOS-input levels)

OPTIONS

MARKING

• Timing

150ns access

-15

170ns access

-17

200ns access

-20

250ns access

-25

300ns access

-30

• Package(s)

Ceramic DIP (600mils)

J

No. 110

• Operating Temperature Ranges

M

PIN ASSIGNMENT

(Top View)

AVAILABLE AS MILITARY

SPECIFICATIONS

• SMD 5962-86063

• MIL-STD-883

32-Pin DIP (J)

(600 MIL)

256K UVEPROM

UV Erasable Programmable

Read-Only Memory

For more products and information

please visit our web site at

www.austinsemiconductor.com

GENERAL DESCRIPTION

The SMJ27C256 series is a set of 262,144 bit, ultraviolet-

light erasable, electrically programmable read-only

memories. These devices are fabricated using power-saving

CMOS technology for high speed and simple interface with

MOS and bipolar circuits. All inputs (including program data

inputs) can be driven by Series 54 TTL circuits without the

use of external pullup resistors. Each output can drive one

Series 54 TTL circuit without external resistors. The data

outputs are 3-state for connecting multiple devices to a

common bus. The SMJ27C256 is pin-compatible with

28-pin 256K ROMs and EPROMs. It is offered in a 600mil

dual-in-line ceramic pagackage (J suffix) rated for operation

from -55°C to 125°C.

Because this EPROM operates from a single 5V supply (in

the read mode), it is ideal for use in microprocessor-based

systems. One other supply (13V) is needed for programming.

All programming signals are TTL level. This device is

programmable by the SNAP! Pulse programming algorithm.

The SNAP! Pulse programming algorithm uses a V

PP

of 13V

and a V

CC

of 6.5V for a nominal programming time of four

seconds. For programming outside the system, existing

EPROM programmers can be used. Locations can be

programmed singly, in blocks, or at random.

Pin Name

Function

A0 - A14

Address Inputs

DA0-DQ7 Inputs (programming)/Outputs

E\

Chip Enable/Power Down

G\

Output Enable

GND

Ground

5V Supply

13V Programming Power Supply

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

V

PP

A12

A7

A6

A5

A4

A3

A2

A1

A0

DQ0

DQ1

DQ2

GND

Vcc

A14

A13

A8

A9

A11

G\

A10

E\

DQ7

DQ6

DQ5

DQ4

DQ3