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PDF AK632256Z Data sheet ( Hoja de datos )
| Número de pieza | AK632256Z | |
| Descripción | 262144 x 32 Bit CMOS - BiCMOS Static Random Access Memory | |
| Fabricantes | ACCUTEK | |
| Logotipo |  |
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ACCUTEK
MICROCIRCUIT CORPORATION
DESCRIPTION
The Accutek AK632256 SRAM Module consists of eight fast high
performance SRAMs mounted on a low profile, 64 pin SIM or ZIP
Board. The module utilizes four 28 pin 256K x 4 SRAMs in 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 0.680 inch SIM or 0.540 inch ZIP to provide for the lowest height
off the board. By offset-mounting the back surface SRAMs on the
SIM version, the module can be mounted in either angled or
straight-up SIM sockets. Each conforms to JEDEC standard sizes
and pin-out configurations. Using two pins for module memory den-
sity identification, PD0 and PD1, minimizes interchangeability and
design considerations when changing from one module size to an-
other in customer applications.
FEATURES
· 262,144 x 32 bit organization
· JEDEC Standardized 64 pin SIM or ZIP format
· Common I/O, single OE functions with four separate chip
selects (CE)
· Low height, 0.680 inch SIM or 0.540 inch ZIP maximum
· Upward compatible with 512K x 32 (AK532512) and
1 Meg x 32 (AK6321024)
AK632256W / AK632256Z
262,144 x 32 Bit CMOS/BiCMOS
Static Random Access Memory
Front View
64-Pin SIM
++
1
32 33
64
64-Pin ZIP
1
32 33
64
· Downward compatible with 32K x 32 (AK63232), 64K x 32
(AK63264) and 128K x 32 (AK632128)
· Presence Detect PD0 and PD1 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 - AK632256W, AK632256Z
· Single 3.3 volt power supply - AK632256W/3.3,
AK632256Z/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 - PD1
Vcc
Vss
WE
Address Inputs
Chip Enable
Data In/Data Out
Output Enable
Presence Detect
Power Supply
Ground
Write Enable
MODULE OPTIONS
Leadless SIM: AK632256W
Leaded SIP: AK632256G
Leaded ZIP: AK632256Z
PIN # SYMBOL PIN # SYMBOL PIN # SYMBOL PIN # SYMBOL
1 Vss 17 A2 33 CE4 49 A4
2 PD0 18 A9 34 CE3 50 A11
3 PD1 19 DQ13 35 A17 51 A5
4 DQ1 20 DQ5 36 A16 52 A12
5 DQ9 21 DQ14 37 OE 53 Vcc
6 DQ2 22 DQ6 38 Vss 54 A13
7 DQ10 23 DQ15 39 DQ25 55
A6
8 DQ3 24 DQ7 40 DQ17 56 DQ21
9 DQ11 25 DQ16 41 DQ26 57 DQ29
10 DQ4 26 DQ8 42 DQ18 58 DQ22
11 DQ12 27 Vss 43 DQ27 59 DQ30
12 Vcc 28 WE 44 DQ19 60 DQ23
13 A0 29 A15 45 DQ28 61 DQ31
14 A7 30 A14 46 DQ20 62 DQ24
15 A1 31 CE2 47 A3 63 DQ32
16 A8 32 CE1 48 A10 64 Vss
PD0 = Vss
PD1 = Vss
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