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.
1
ACCUTEK
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
32
33
64
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, PD
0
and PD
1
, 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)
·
Downward compatible with 32K x 32 (AK63232), 64K x 32
(AK63264) and 128K x 32 (AK632128)
·
Presence Detect PD
0
and PD
1
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, 0
0
C to 70
0
C
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
A
0
- A
17
CE
1
- CE
4
DQ
1
- DQ
32
OE
PD
0
- PD
1
Vcc
Vss
WE
Address Inputs
Chip Enable
Data In/Data Out
Output Enable
Presence Detect
Power Supply
Ground
Write Enable
PIN ASSIGNMENT
PIN #
SYMBOL
PIN #
SYMBOL
PIN #
SYMBOL
PIN #
SYMBOL
FUNCTIONAL DIAGRAM
CE
4
CE
3
A
17
A
16
OE
Vss
DQ
25
DQ
17
DQ
26
DQ
18
DQ
27
DQ
19
DQ
28
DQ
20
A
3
A
10
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
A
4
A
11
A
5
A
12
Vcc
A
13
A
6
DQ
21
DQ
29
DQ
22
DQ
30
DQ
23
DQ
31
DQ
24
DQ
32
Vss
1
2
3
4
5
6
7
8
9
10
11
Vss
PD
0
PD
1
DQ
1
DQ
9
DQ
2
DQ
10
DQ
3
DQ
11
DQ
4
DQ
12
Vcc
A
0
A
7
A
1
A
8
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
A
2
A
9
DQ
13
DQ
5
DQ
14
DQ
6
DQ
15
DQ
7
DQ
16
DQ
8
Vss
WE
A
15
A
14
CE
2
CE
1
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
MODULE OPTIONS
Leadless SIM: AK632256W
Leaded SIP: AK632256G
Leaded ZIP: AK632256Z
12
13
14
15
16
PD
0
= Vss
PD
1
= Vss
ORDERING INFORMATION
PART NUMBER CODING INTERPRETATION
Position
1
1
2
3
4
5
6
7
8
MECHANICAL DIMENSIONS
Inches
Top View ZIP
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 0
0
C to +70
0
C
M = Military Equivalent Screened
(-55
0
C to +125
0
C)
I = Industrial Temperature Tested
(-45
0
C to +85
0
C)
X = Burned In
8 Speed (first two significant digits)
DRAMS
SRAMS
60 = 60 nS
12 = 12 nS
70 = 70 nS
20 = 20 nS
80 = 80 nS
25 = 25 nS
10 = 100 nS 35 = 35 nS
The numbers and coding on this page do not include all varia-
tions available but are shown as examples of the most widely
used variations. Contact Accutek if other information is required.
Module also available using 300 mil SRAMs
Height of SIM Version = 0.600”
Height of ZIP Version = 0.500”
1
2
3
4
5
6
59
60
61
62
64
63
0.680
MAX
.100 x .100
ANGLE NOTCH
0.125
0.155
0.540
MAX
C
L
0.125
0.135
CC
LL
1
.425
.375
+
1
C
L
0.135
0.165
CC
LL
0.050
TYP
0.050
TYP
3.590
3.610
64
3.855
3.845
+
0.100
TYP
C C
L L
EXAMPLES:
AK632256W-12
256K x 32, 12 nSEC SRAM Module, SIM Configuration
AK632256Z-15
256K x 32, 15 nSEC SRAM Module, ZIP Configuration
0.350
MAX
MICROCIRCUIT CORPORATION
ACCUTEK
5 NEW PASTURE ROAD
NEWBURYPORT, MA 01950-4040
PHONE: 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 im-
plied. 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.
0.350
MAX
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