AK632256AW-72_09 Datasheet, PDF (1/2 Pages) ACCUTEK MICROCIRCUIT CORPORATION – Static Random Access Memory

ACCUTEK
MICROCIRCUIT CORPORATION
DESCRIPTION
AK632256AW-72
262,144 x 32 Bit CMOS/BiCMOS
72 Pin Format
Static Random Access Memory
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
Front View
72-Pin SIM
· 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, 0⁰C to 70⁰C
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.
PIN NOMENCLATURE
PIN ASSIGNMENT
FUNCTIONAL DIAGRAM
A0 - A17
CE1 - CE4
DQ1 - DQ32
OE
PD0 - PD3
Vcc
Vss
WE
NC
Address Inputs
Chip Enable
Data In/Data Out
Output Enable
Presence Detect
5v Supply
Ground
Write Enable
No Connect
MODULE OPTIONS
Leadless SIM: AK632256AW-72
PIN # SYMBOL PIN # SYMBOL PIN # SYMBOL PIN # SYMBOL
1
NC 19 A1 37 CE4 55 A5
2
NC 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 CE2 53 A4 71 NC
18 A7 36 CE1 54 A11 72 NC
PD0 = Vss
PD1 = Vss
PD2 = Open
PD3 = Open