DESCRIPTION
The Accutek AK632256AW SRAM Module consists of eight fast
high performance SRAMs mounted on a low profile, 64 pin SIM
PCB. The module utilizes four 28 pin 256K x 4 SRAMs in 300 mil
SOJ packages and four decoupling capacitor chips 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 modules conform
to JEDEC standard sizes and pin-out configurations. Using two
pins for module memory density identification, PD0and PD1, 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 64 pin SIM format
·Available with solder or gold leads
·Presence Detect PD0and PD1for identifying module density
·Common I/O, single OE functions with four separate chip
selects (CE)
·Low height, 0.600 inch maximum seated height
·Downward compatible with 128K x 32 (AK632128), 64K x 32
(AK63264) and 32K x 32 (AK63232)
·Upward compatible with 512K x 32 (AK632512) and 1 Meg x 32
(AK6321024)
·Fast access times range from 12 nSEC BiCMOS to 45 nSEC
CMOS
·TTL-compatible inputs and outputs
·Single 5 volt power supply
·Operating temperature range in free air, 00Cto70
0C
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
262,144 x 32 Bit CMOS/BiCMOS
Static Random Access Memory
64-Pin SIM
Top View
132 33 64
PIN NOMENCLATURE
A0-A
17 Address Inputs
CE1-CE
4Chip Enable
DQ1-DQ
32 Data In/Data Out
OE Output Enable
PD0-PD
1Presence Detect
Vcc 5v Supply
Vss Ground
WE Write Enable
MODULE OPTIONS
Leadless SIM, Solder Leads: AK632256AW
Leadless SIM, Gold Leads: AK632256AWG
PIN ASSIGNMENT
PIN # SYMBOL PIN # SYMBOL PIN # SYMBOL PIN # SYMBOL
1 Vss 17 A2 33 CE449 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
FUNCTIONAL DIAGRAM
ORDERING INFORMATION
PART NUMBER CODING INTERPRETATION
Position 12345678
1 Product
AK = Accutek Memory
2 Type
4 = Dynamic RAM
5 = CMOS Dynamic RAM
6 = Static RAM
3 Organization/Word Width
1 = by 1 16 = by 16
4 = by 4 32 = by 32
8 = by 8 36 = by 36
9 = by 9
4 Size/Bits Depth
64 = 64K 4096 = 4 MEG
256 = 256K 8192 = 8 MEG
1024 = 1 MEG 16384 = 16 MEG
5 Package Type
G = Single In-Line Package (SIP)
S = Single In-Line Module (SIM)
D = Dual In-Line Package (DIP)
W = .050 inch Pitch Edge Connect
Z = Zig-Zag In-Line Package (ZIP)
6 Special Designation
P = Page Mode
N = Nibble Mode
K = Static Column Mode
W = Write Per Bit Mode
V = Video Ram
7 Separator
- = Commercial 00Cto+70
0C
M = Military Equivalent Screened
(-550C to +1250C)
I = Industrial Temperature Tested
(-450Cto+85
0C)
X = Burned In
8 Speed (first two significant digits)
DRAMS SRAMS
50 = 50 nS 8 = 8 nS
60 = 60 nS 10 = 10 nS
70 = 70 nS 12 = 12 nS
80 = 80 nS 15 = 15 nS
3.855
3.845
0.135
0.165 0.050
TYP
C
L
1
0.600
MAX
0.350
MAX
0.425
0.375
C
LC
L
C
LC
LC
L
72
ACCUTEK MICROCIRCUIT CORPORATION
BUSINESS CENTER at NEWBURYPORT
2 NEW PASTURE ROAD, SUITE 1
NEWBURYPORT, MA 01950-4054
VOICE: 978-465-6200 FAX: 978-462-3396
Email: sales@accutekmicro.com
Internet: www.accutekmicro.com
Accutek reserves the right to make changes in specifications at any
time and without notice. Accutek does not assume any responsibility
for the use of any circuitry described; no circuit patent licenses are
implied. Preliminary data sheets contain minimum and maximum
limits based upon design objectives, which are subject to change
upon full characterization over the specific operating conditions.
MECHANICAL DIMENSIONS
Inches
The numbers and coding on this page do not include all variations
available but are show as examples of the most widely used variations.
Contact Accutek if other information is required.
EXAMPLES:
AK632256AWG-12
256K x 32, 12 nSEC SRAM Module, SIM Configuration with Gold Leads
AK632256AW-15
256K x 32, 15nSEC SRAM Module, SIM Configuration with Solder Leads
