DESCRIPTION
Accutek
Microcircuit
Corporation
AK632512W / AK632512Z
524,288 x 32 Bit CMOS / BiCMOS
Static Random Access Memory
Front View
72-Pin SIM
The Accutek AK632512 SRAM Module consists of fast high perfor-
mance SRAMs mounted on a low height, 72 pin SIM or ZIP Board.
The module utilizes four 36 pin 512K x 8 SRAMs in 400 mil SOJ
packages and four decoupling capacitors mounted on the front 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 or 0.555 inch ZIP to provide for the lowest height
off the board. Each conforms to JEDEC-standard sizes and pin-out
configurations. Using four pins for module memory density identifi-
cation, PD
0
, PD
1
, PD
2
and PD
3
minimizes interchangeability and
design considerations when changing from one module size to the
other in customer applications.
1
36
37
72
72-Pin ZIP
1
36
37
72
FEATURES
·
524,288 x 32 bit organization
·
JEDEC Standard 72 pin SIM or ZIP format
·
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 or 0.555 inch ZIP maximum
·
Power:
720mA Max Active (20 nSEC)
760mA Max Active (15 nSEC)
800mA Max Active (12 nSEC)
200mA Max Standby
·
TTL-compatible inputs and outputs
·
Presence Detect, PD0, PD1, PD2 and PD3 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)
·
Single 5 volt power supply - AK632512W, AK632512Z
·
Single 3.3 volt power supply - AK632512W/3.3,
AK632512Z/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
- PD
3
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 +
1
2
3
4
5
6
7
8
9
10
11
12
NC
NC
PD2
PD3
Vss
PD0
PD1
DQ1
DQ9
DQ2
DQ10
DQ3
DQ11
DQ4
DQ12
Vcc
A0
A7
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
A1
A8
A2
A9
DQ13
DQ5
DQ14
DQ6
DQ15
DQ7
DQ16
DQ8
Vss
WE
A15
A14
CE2
CE1
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
CE4
CE3
A17
A16
OE
Vss
DQ25
DQ17
DQ26
DQ18
DQ27
DQ19
DQ27
DQ20
A3
A10
A4
A11
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
A5
A12
Vcc
A13
19
A0 - A18
* WE
DQ1 - DQ8
* OE
CE
+ DQ1 - DQ8
CE1 +
A6
DQ21
DQ29
DQ22
DQ30
DQ23
DQ31
DQ24
DQ32
* OE
CE2 +
A0 - A18
* WE
DQ1 - DQ8
+ DQ17 - DQ24
A0 - A18
* WE
DQ1 - DQ8
* OE
CE
+ DQ9 - DQ16
MODULE OPTIONS
Leadless SIM: AK632512W
Leaded SIP: AK632512G
Leaded ZIP: AK632512Z
13
14
15
16
17
18
Vss
A18
NC
A0 - A168
CE
CE3 +
NC
* WE
NC
* OE
*
*
*
DQ1 - DQ8
+ DQ25 - DQ32
CE4 +
*
PD0
PD1
=
=
Open
Open
PD2
PD3
=
=
Vss
Open
CE
ACCUTEK [ ACCUTEK MICROCIRCUIT CORPORATION ]
