Accutek
Microcircuit
Corporation
DESCRIPTION
The Accutek AK632512AW SRAM Module consists of fast high per-
formance SRAMs mounted on a low height, 64 pin SIM Board. The
module utilizes four 36 pin 512K x 8 SRAMs in 400 mil SOJ pack-
ages and four decoupling capacitors mounted two on the front side
and two on the back side of a printed circuit board.
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 15 nSEC to
35 nSEC in CMOS or BiCMOS technology.
The Accutek module is designed to have a maximum seated height
of 0.640 inch SIM to provide for the lowest height off the board. The
module conforms to JEDEC-standard size. The Presence Detect
feature has been disabled on this 64 pin module. The customer
must jumper his board to provide density identification. The avail-
able 72 pin module has the Presence Detect feature operational.
1
AK632512AW - 64 Pin Version
524,288 x 32 Bit CMOS / BiCMOS
Static Random Access Memory
Front View
32
33
64
Back View
64
33
32
1
FEATURES
·
524,288 x 32 bit organization
·
Similar to JEDEC standard 64 pin SIM format except that A
18
replaces PD
1
on Pin #3
·
Common I/O, single OE and WE functions with four separate
chip selects (CE)
·
Fast access times from 15 nSEC
·
Low height, 0.640 inch SIM maximum
·
Power:
720mA Max Active (20 nSEC)
760mA Max Active (15 nSEC)
800mA Max Active (12 nSEC)
200mA Max Standby
·
Presence Detect, PD
0
is open for identifying module density
·
Downward compatible with 256K x 32 (AK632256), 128K x 32
(AK632128), 64K x 32 (AK63264) and 32K x 32 (AK63232), 64
pin SIM or ZIP designs
·
Upward compatible with 1 Meg x 32 (AK6321024)
·
TTL-compatible inputs and outputs
·
Single 5 volt power supply - AK632512AW
·
Single 3.3 volt power supply - AK632512AW/3.3
·
Operating free air temperature 0
0
to 70
0
C
ELECTRICAL SPECIFICATIONS
Timing diagrams and basic electrical characteristics are those of the
standard 512K x 8 SRAMs used to construct these modules.
Accutek’s module design allows the flexibility of selecting indus-
try-compatible 512K x 8 SRAMs from several SRAM manufacturers.
PIN NOMENCLATURE
A
0
- A
18
CE
1
- CE
4
DQ
1
- DQ
32
OE
PD
0
Vcc
Vss
WE
Address Inputs
Chip Enable
Data In/Data Out
Output Enable
Presence Detect
5v Supply
Ground
Write Enable
PIN ASSIGNMENT
PIN #
SYMBOL
PIN #
SYMBOL
PIN #
SYMBOL
PIN #
SYMBOL
FUNCTIONAL DIAGRAM
A0 - A18 +
WE +
OE +
19
A0 - A18
* WE
DQ1 - DQ8
+ DQ1 - DQ8
* OE
CE
1
2
3
4
5
6
7
8
9
10
11
12
Vss
PD0
A18
DQ1
DQ9
DQ2
DQ10
DQ3
DQ11
DQ4
DQ12
Vcc
A0
A7
A1
A8
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
A2
A9
DQ13
DQ5
DQ14
DQ6
DQ15
DQ7
DQ16
DQ8
Vss
WE
A15
A14
CE2
CE1
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
CE4
CE3
A
17
A
16
OE
Vss
DQ25
DQ17
DQ26
DQ18
DQ27
DQ19
DQ28
DQ20
A3
A10
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
A4
A11
A5
A12
Vcc
CE1 +
A0 - A18
A13
* WE
*
A6
D21
DQ29
DQ22
DQ30
DQ23
DQ31
DQ24
DQ32
Vss
CE3 +
CE2 +
A0 - A18
* WE
* OE
DQ1 - DQ8
+ DQ9 - DQ16
CE
*
MODULE OPTIONS
Leadless SIM: AK632512AW
DQ1 - DQ8
* OE
CE
+ DQ17 - DQ24
13
14
15
16
A0 - A168
* WE
DQ1 - DQ8
* OE
CE
CE4 +
+ DQ25 - DQ32
PD
0
= Open
*
*
ACCUTEK [ ACCUTEK MICROCIRCUIT CORPORATION ]
