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
ORDERING INFORMATION
PART NUMBER CODING INTERPRETATION
Position 12345678
1 Product
AK = Accutek Memory
2 Type
4 = Dynamic RAM
5 = CMOS Dynamic RAM
6 = Static RAM
3 Organization/Word Width
1 = by 1 16 = by 16
4 = by 4 32 = by 32
8 = by 8 36 = by 36
9 = by 9
4 Size/Bits Depth
64 = 64K 4096 = 4 MEG
256 = 256K 8192 = 8 MEG
1024 = 1 MEG 16384 = 16 MEG
5 Package Type
G = Single In-Line Package (SIP)
S = Single In-Line Module (SIM)
D = Dual In-Line Package (DIP)
W = .050 inch Pitch Edge Connect
Z = Zig-Zag In-Line Package (ZIP)
6 Special Designation
P = Page Mode
N = Nibble Mode
K = Static Column Mode
W = Write Per Bit Mode
V = Video Ram
7 Separator
- = Commercial 00Cto+70
0C
M = Military Equivalent Screened
(-550C to +1250C)
I = Industrial Temperature Tested
(-450Cto+85
0C)
X = Burned In
8 Speed (first two significant digits)
DRAMS SRAMS
50 = 50 nS 8 = 8 nS
60 = 60 nS 10 = 10 nS
70 = 70 nS 12 = 12 nS
80 = 80 nS 15 = 15 nS
ACCUTEK MICROCIRCUIT CORPORATION
BUSINESS CENTER at NEWBURYPORT
2 NEW PASTURE ROAD, SUITE 1
NEWBURYPORT, MA 01950-4054
VOICE: 978-465-6200 FAX: 978-462-3396
Email: sales@accutekmicro.com
Internet: www.accutekmicro.com
Accutek reserves the right to make changes in specifications at any
time and without notice. Accutek does not assume any responsibility
for the use of any circuitry described; no circuit patent licenses are
implied. Preliminary data sheets contain minimum and maximum
limits based upon design objectives, which are subject to change
upon full characterization over the specific operating conditions.
MECHANICAL DIMENSIONS
Inches
The numbers and coding on this page do not include all variations
available but are show as examples of the most widely used variations.
Contact Accutek if other information is required.
EXAMPLES:
AK68512D-70
512K x 8, 70 nSEC SRAM Module, DIP Configuration
