Accutek
Microcircuit
Corporation
AK68512D
524,288 x 8 Bit CMOS
Static Random Access Memory
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
ELECTRICAL SPECIFICATIONS
· Fast access time: 85 - 120 nSEC
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.
· 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 power supply - AK68512D
· Single 3.3 volt power supply - AK68512D/3.3
· Operating free air temperature 00 to 700C
PIN NOMENCLATURE
PIN ASSIGNMENT
DQ1 - DQ8
A0 - A18
CE
Data In/Data Out
Adress Inputs
Chip Enable
Write Enable
5v Supply
A18
A16
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ1
DQ2
DQ3
VSS
VCC
A15
30 A17
32
31
1
2
3
4
5
6
7
8
WE
29
28
27
26
25
24
23
22
21
20
19
18
17
WE
A13
A8
A9
A11
OE
A10
CE
DQ8
DQ7
DQ6
DQ5
DQ4
Vcc
Vss
Ground
OE
Output Enable
9
10
11
12
13
14
15
16
TIMING OPTIONS
70 nSEC Access Time
85 nSEC Access Time
100 nSEC Access Time
120 nSEC Access Time
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