DESCRIPTION
The Accutek AK68512D high density memory module is a static
random access memory organized in 512K x 8 bit words. The as-
sembly consists of two medium speed 128K x 8 SRAMs in thin
TSOP packages and a CMOS decoder logic IC mounted on the top
side and two medium speed 128K x 8 SRAMs in thin TSOP pack-
ages mounted on the bottom surfaces of a printed circuit board.
The module is supplied in a 600 mil wide,32 pin DIP (Dual In-Line
Package) configuration. This pinout is completely compatible with
forthcoming industry standard monolithic designs. These modules
are intended for use in applications where limited board space dic-
tates compact module designs.
The operation of the AK68512D is identical to standard monolithic 8
bit word wide SRAMs.
The AK68512D offers the features of low power and medium speed
by using CMOS devices and makes high density mounting possible
with no surface mount technology.
FEATURES
·524,288 x 8 bit organization
·Fast access time: 85 - 120 nSEC
·Completely static RAM, no clock or timing strobe required
·Inputs and outputs TTL compatible
·Conventional 600 mil wide SIP package with industry
compatible pinout
·Single +5 Volt (+/- 10%) power supply
·Operating free air temperature 00to 700C
ELECTRICAL SPECIFICATIONS
Timing diagrams and basic electrical characteristics are those of
the standard 128K x 8 SRAMs used to construct these modules.
Accutek’s module design allows the flexibility of selecting indus-
try-compatible 128K x 8 SRAMs from any of a number of semicon-
ductor manufacturers.
Accutek
Microcircuit
Corporation
AK68512D
524,288 x 8 Bit CMOS
Static Random Access Memory
1
1
Top View
Bottom View
PIN NOMENCLATURE
DQ1-DQ
8Data In/Data Out
A0-A
18 Adress Inputs
CE Chip Enable
WE Write Enable
Vcc 5v Supply
Vss Ground
OE Output Enable
TIMING OPTIONS
70 nSEC Access Time
85 nSEC Access Time
100 nSEC Access Time
120 nSEC Access Time
PIN ASSIGNMENT
A
A
A
A
A
A
A
A
A
A
A
A
DQ
DQ
DQ
V
18
16
14
12
7
6
5
4
3
2
1
0
1
2
3
SS
V
A
A
WE
A
A
A
A
OE
A
CE
DQ
DQ
DQ
DQ
DQ
CC
15
17
13
8
9
11
10
8
7
6
5
4
Top View
1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
