DESCRIPTION

The Accutek AK681024G is a high density SRAM memory module

organized in 1 Meg X 8 bit words. The assembly consists of four me-

dium speed 128K X 8 SRAMs in thin TSOP packages, plus a CMOS

decoder logic IC and four decoupling capacitor chips, mounted on

the front side and four medium speed 128K x 8 SRAMS in thin

TSOP packages and four decoupling capacitor chips mounted on

the back side of a low-profile printed circuit board. The module con-

figuration is a 36 pin leaded SIP.

The memory operates as a single asynchronous 1 Meg X 8 SRAM

from a 5V supply, and has common I/O, chip enable, output enable

and write enable functions. With the proper choice of SRAMs, it is

available in three separate low-standby-power configurations, with

access times of 55, 70, 85 or 100 nSEC.

The combination of low power, low profile and high density packag-

ing offered by the AK681024G makes it ideal for use in applications

where board space and available power are limited and extremely

low access times are not required. It is especially useful in VMEbus

designs and in places where very close module-to-module spacing

is dictated.

FEATURES

· 1,048,576 x 8 bit organization

· JEDEC Standard 36 pin SIP format

· Common I/O, single OE,CE and WE functions

· Low 0.550 inch maximum seated height and thin profile allow

maximum board density

· Range of access times from 55 to 100 nSEC

· Low, low-low and ultra-low standby power level versions avail-

able

· Single 5 volt power supply - AK681024G

· Single 3.3 volt power supply - AK681024G/3.3

· Operating free air temerature 0

version of -10

· Completely static and asynchronous, no clock or timing strobe

required

·

Low

Low Low

9.0 Watt Max Active

9.0 Watt Max Active

120 µ Watt Max Standby

80 µ Watt Standby

ACCUTEK

MICROCIRCUIT CORPORATION

AK681024G

1,048,579 x 8 Bit CMOS

Static Random Access Memory

1

36

PIN NOMENCLATURE

Data In/Data Out

Address Inputs

CE

Chip Enable

WE

Write Enable

OE

Output Enable

Vcc

5v Supply

Vss

Ground

NC

No Connection

MODULE OPTIONS

Leaded SIP: AK681024G

PIN ASSIGNMENT

PIN #

SYMBOL

PIN #

SYMBOL

PIN #

SYMBOL

PIN #

SYMBOL

1NC

10

19

CE

28

2

Vcc

11

Vss

20

29

3WE

12

21

30

13

22

31

14

23

32

15

24

33

16

25

34

17

26

Vss

35

Vcc

18

27

36

OE

FUNCTIONAL DIAGRAM

128K x 8 SRAM

128K x 8 SRAM

128K x 8 SRAM

128K x 8 SRAM

128K x 8 SRAM

128K x 8 SRAM

128K x 8 SRAM

128K x 8 SRAM

DECODER