Accutek
Microcircuit
Corporation
AK681024G
1,048,579 x 8 Bit CMOS
Static Random Access Memory
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.
1
36
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.
· 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
FEATURES
· Single 3.3 volt power supply - AK681024G/3.3
· Operating free air temerature 00C to 700C (Industrial range
· 1,048,576 x 8 bit organization
version of -100C to 850C also available)
· JEDEC Standard 36 pin SIP format
· Common I/O, single OE, CE and WE functions
· Completely static and asynchronous, no clock or timing strobe
required
· Low 0.550 inch maximum seated height and thin profile allow
maximum board density
·
Low
90 Watt Max Active
120 µ Watt Max Standby
Low Low
90 Watt Max Active
80 µ Watt Standby
PIN NOMENCLATURE
PIN ASSIGNMENT
FUNCTIONAL DIAGRAM
PIN #
1
SYMBOL
NC
PIN #
10
11
12
13
14
15
16
17
18
SYMBOL
A4
PIN #
19
20
21
22
23
24
25
26
27
SYMBOL
CE
PIN #
28
29
30
31
32
33
34
35
36
SYMBOL
A7
DQ0 - DQ7
A0 - A19
CE
Data In/Data Out
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
Address Inputs
Chip Enable
Write Enable
Output Enable
5v Supply
2
Vcc
WE
DQ2
DQ3
DQ0
A1
Vss
DQ5
A10
A15
A16
A12
A18
A6
A8
3
A9
4
DQ7
DQ4
DQ6
A17
WE
5
A11
OE
6
A5
7
A13
DQ1
Vss
A0
Vcc
8
A2
A14
Vcc
OE
Vss
Ground
9
A3
A19
NC
No Connection
MODULE OPTIONS
Leaded SIP: AK681024G
DECODER