Accutek
Microcircuit
Corporation
AK632128W / AK632128Z
131,072 x 32 Bit CMOS/BiCMOS
Static Random Access Memory
DESCRIPTION
Top View
64-Pin SIMM
The Accutek AK632128 SRAM Module consists of fast high perfor-
mance SRAMs mounted on a low height, 64 pin SIM or ZIP PCB.
The module utilizes four 32 pin 128K x 8 SRAMs in 400 mil SOJ
packages and four decoupling capacitors mounted on the front side
of a printed circuit board.
1
32 33
64
The SRAMs used have common I/O functions and single output en-
able functions. Also, four separate chip select (CE) connections are
used to independently enable the four bytes. The modules can be
supplied in a variety of access time values from 7nSEC to 35nSEC
in CMOS or BiCMOS technology.
64-Pin ZIP
The Accutek module is designed to have a maximum seated height
of 0.620 inch SIM or 0.540 inch ZIP to provide for the lowest height
off the board. Each conforms to JEDEC-standard sizes and pin-out
configurations. Using two pins for module denisty identification,
PD0 and PD1, minimizes interchangeability and design consider-
ations when changing from one module size to the other in cus-
tomer applications.
32
33
64
1
· Common I/O, single OE functions with four separate chip se-
lects (CE)
· Presence Detect PD0 and PD1 for identifying module density
· Downward compatible with 32K x 32 (AK63232) and 64K x 32
AK63264)
· Upward compatible with 256K x 32 (AK632256), 512K x 32
(AK632512) and 1 Meg x 32 (AK6321024)
FEATURES
· Operating free air temperature 00 to 700C
· 131,072 x 32 bit organization
· JEDEC Standard 64 pin SIM or ZIP format
· Access times as fast as 7nSEC
ELECTRICAL SPECIFICATIONS
· TTL compatible inputs and outputs
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 at least seven semiconductor
manufacturers.
· Very low profile, 0.620 inch MAX seated height SIM Version
· Very low profile, 0.540 inch MAX seated height ZIP Version
· Single 5 Volt power supply - AK632128W, AK632128Z
· Single 3.3 Volt power supply - AK63128W/3.3, AK632128Z/3.3
PIN NOMENCLATURE
PIN ASSIGNMENT
FUNCTIONAL DIAGRAM
PIN #
1
SYMBOL
Vss
PIN #
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
SYMBOL
A2
PIN #
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
SYMBOL
CE4
PIN #
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
SYMBOL
A4
A0 - A16
CE1 - CE4
DQ1 - DQ32
OE
Address Inputs
A0 - A16
WE
+
+
A0 - A16
WE
17
Chip Enable
Data In/Data Out
Output Enable
Presence Detect
Power Supply
Ground
*
*
2
PD0
PD1
DQ1
DQ9
DQ2
DQ10
DQ3
DQ11
DQ4
DQ12
Vcc
A9
CE3
A11
+
+
+
+
DQ1 - DQ8
DQ1 - DQ8
DQ1 - DQ8
DQ1 - DQ8
DQ1 - DQ8
OE
3
DQ13
DQ5
DQ14
DQ6
DQ15
DQ7
DQ16
DQ8
Vss
NC
A5
+
+
OE
4
A16
A12
CE
CE1
5
OE
Vcc
PD0 - PD1
Vcc
6
Vss
A13
A0 - A16
WE
7
DQ25
DQ17
DQ26
DQ18
DQ27
DQ19
DQ28
DQ20
A3
A6
*
*
DQ9 - DQ16
DQ17 - DQ24
DQ25 - DQ32
8
DQ21
DQ29
DQ22
DQ30
DQ23
DQ31
DQ24
DQ32
Vss
OE
Vss
9
CE
WE
Write Enable
No Connect
10
11
12
13
14
15
16
CE2
CE3
CE4
+
+
+
NC
A0 - A16
WE
WE
*
*
A0
A15
OE
MODULE OPTIONS
A7
A14
CE
A1
CE2
CE1
Leadless SIM: AK632128W
Leaded ZIP: AK632128Z
A8
A10
A0 - A16
WE
*
*
PD0 = Open
PD1 = Open
OE
CE