ACCUTEK AK632256AW

AK632256AW-72
262,144 x 32 Bit CMOS/BiCMOS
72 Pin Format
Static Random Access Memory
ACCUTEK
MICROCIRCUIT CORPORATION
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.
Front View
72-Pin SIM
The SRAMs used have common I/O functions and single output enable 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 offset-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, minimizes 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 selects (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
PIN NOMENCLATURE
· 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 industry-compatible 256K x 4 SRAMs from several semiconductor manufacturers.
PIN ASSIGNMENT
FUNCTIONAL DIAGRAM
PIN #
SYMBOL
PIN #
SYMBOL
PIN #
SYMBOL
PIN #
1
NC
19
A1
37
CE4
55
A5
Chip Enable
2
NC
20
A8
38
CE3
56
A12
Data In/Data Out
3
PD2/NC
21
A2
39
A17
57
Vcc
4
PD3/NC
22
A9
40
A16
58
A13
DQ13
41
OE
59
A6
A0 - A17
Address Inputs
CE1 - CE4
DQ1 - DQ32
SYMBOL
OE
Output Enable
5
Vss
23
PD0 - PD3
Presence Detect
6
PD0
24
DQ5
42
Vss
60
DQ21
Vcc
5v Supply
7
PD1
25
DQ14
43
DQ25
61
DQ29
Vss
Ground
8
DQ1
26
DQ6
44
DQ17
62
DQ22
9
DQ9
27
DQ15
45
DQ26
63
DQ38
WE
Write Enable
10
DQ2
28
DQ7
46
DQ18
64
DQ23
NC
No Connect
11
DQ10
29
DQ16
47
DQ27
65
DQ31
12
DQ3
30
DQ8
48
DQ19
66
DQ24
13
DQ11
31
Vss
49
DQ28
67
DQ32
MODULE OPTIONS
Leadless SIM: AK632256AW-72
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
MECHANICAL DIMENSIONS
ORDERING INFORMATION
Inches
PART NUMBER CODING INTERPRETATION
Position
1
2
3
4
5
6
7
8
0.400
0.240
0.260
0.080
0.070
0.475
0.425
0.050
TYP
4.245
4.255
3.995
3.975
0.130
0.120
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 00C to +700C
M = Military Equivalent Screened
(-550C to +1250C)
I = Industrial Temperature Tested
(-450C to +850C)
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
The numbers and coding on this page do not include all variations available but are shown as examples of the most widely
used variations. Contact Accutek if other information is required.
0.605
0.595
1
EXAMPLES:
ACCUTEK
MICROCIRCUIT CORPORATION
0.350
MAX
AK632256AW72-12
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 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.