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AK632256AW-72 Datasheet(PDF) 1 Page - ACCUTEK MICROCIRCUIT CORPORATION

Part # AK632256AW-72
Description  Static Random Access Memory
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Manufacturer  ACCUTEK [ACCUTEK MICROCIRCUIT CORPORATION]
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AK632256AW-72 Datasheet(HTML) 1 Page - ACCUTEK MICROCIRCUIT CORPORATION

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DESCRIPTION
The Accutek AK632256AW-72 SRAM Module consists of fast high
performance SRAMs mounted on a low profile, 72 pin SIM Board.
The module utilizes four 28 pin 256K x 4 SRAMs in 300 mil SOJ
packages and four decoupling capacitors mounted on each 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 12 nSEC to
45 nSEC in CMOS or BiCMOS technology.
The Accutek module is designed to have a maximum seated height
of 0.600 inch to provide for the lowest height off the board. By off-
set-mounting the back surface SRAMs the module can be mounted
in either angled or straight-up SIM sockets. The module conforms
to JEDEC standard sizes and pin-out configurations. Using four
pins for module memory density identification, PD0 to PD3, mini-
mizes interchangeability and design considerations when changing
from one module size to another in customer applications.
FEATURES
· 262,144 x 32 bit organization
· JEDEC Standardized 72 pin SIM or ZIP pinout
· Common I/O, single OE functions with four separate chip se-
lects (CE)
· Low height, 0.605 inch maximum
· Upward compatible with 512K x 32 (AK632512) and 1 Meg x 32
(AK6321024)
· Downward compatible with 32K x 32 (AK63232), 64K x 32
(AK63264) and 128K x 32 AK632128
· Presence Detect PD0 to PD3 for identifying module density
· Fast access times range from 12 nSEC BiCMOS to 45 nSEC
CMOS
· TTL-compatible inputs and outputs
· Single 5 volt power supply - AK632256AW-72
· Single 3.3 volt power supply - AK632256AW-72/3.3
· Operating temperature range in free air, 0
0Cto700C
ELECTRICAL SPECIFICATIONS
Timing diagrams and basic electrical characteristics are those of
the standard 256K x 4 SRAMs used to construct these modules.
Accutek’s module design allows the flexibility of selecting indus-
try-compatible 256K x 4 SRAMs from several semiconductor manu-
facturers.
ACCUTEK
MICROCIRCUIT CORPORATION
AK632256AW-72
262,144 x 32 Bit CMOS/BiCMOS
72 Pin Format
Static Random Access Memory
Front View
72-Pin SIM
PIN NOMENCLATURE
A0 -A17
Address Inputs
CE1 -CE4
Chip Enable
DQ1 -DQ32
Data In/Data Out
OE
Output Enable
PD0 -PD3
Presence Detect
Vcc
5v Supply
Vss
Ground
WE
Write Enable
NC
No Connect
MODULE OPTIONS
Leadless SIM: AK632256AW-72
PIN ASSIGNMENT
PIN #
SYMBOL
PIN #
SYMBOL
PIN #
SYMBOL
PIN #
SYMBOL
1NC
19
A1
37
CE455
A5
2NC
20
A8
38
CE3
56
A12
3
PD2/NC
21
A2
39
A17
57
Vcc
4
PD3/NC
22
A9
40
A16
58
A13
5
Vss
23
DQ13
41
OE
59
A6
6
PD0
24
DQ5
42
Vss
60
DQ21
7
PD1
25
DQ14
43
DQ25
61
DQ29
8
DQ1
26
DQ6
44
DQ17
62
DQ22
9
DQ9
27
DQ15
45
DQ26
63
DQ38
10
DQ2
28
DQ7
46
DQ18
64
DQ23
11
DQ10
29
DQ16
47
DQ27
65
DQ31
12
DQ3
30
DQ8
48
DQ19
66
DQ24
13
DQ11
31
Vss
49
DQ28
67
DQ32
14
DQ4
32
WE
50
DQ20
68
Vss
15
DQ12
33
A15
51
A3
69
A18/NC
16
Vcc
34
A14
52
A10
70
A19/NC
17
A0
35
CE253
A4
71
NC
18
A7
36
CE1
54
A11
72
NC
PD0 = Vss
PD2 = Open
PD1 = Vss
PD3 = Open
FUNCTIONAL DIAGRAM


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