MICROCIRCUIT CORPORATION
DESCRIPTION
The Accutek AK616256D SRAM Module consists of four fast high
performance SRAMs mounted on a low profile 48 pin DIP Board.
The module utilizes four 28 pin 256K x 4 SRAMs in SOJ packages
and four decoupling capacitors mounted on a printed circuit board.
The SRAMs used have common I/O functions and single output en-
able functions. Also, four separate chip select (CS) connections are
used to independently enable the four chips. The modules can be
supplied in a variety of access time values from 12nSEC to 45nSEC
in CMOS or BiCMOS technology.
The Accutek module is designed to have a maximum seated height
of 0.230 inch to provide for the lowest height off the board. Each
conforms to JEDEC standard sizes and pin-out configurations.
ACCUTEK
AK616256D
262,144 x 16 Bit CMOS/BiCMOS
Static Random Access Memory
FEATURES
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262,144 x 16 bit organization
JEDEC Standardized 48 Pin DIP
Common I/O with four separate chip selects (CS)
Low height 0.230 inch DIP maximum
Fast access times range from 12 nSEC BiCMOS to 45nSEC
CMOS
TTL-compatible inputs and outputs
Single 5 volt power supply - AK616256D
Single 3.3 volt power supply - AK616256D-3.3
Operating free air temperature 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 industry-
com pat i ble 256K x 4 SRAMs from sev eral semi con duc tor
manufactrurers.
PIN NOMENCLATURE
A
0
- A
17
CS
1
- CS
4
DQ
0
- DQ
15
WE
L
- WE
U
Vcc
Vss
NC
Address Inputs
Chip Select
Data In/Date Out
Write Enable
5v Supply
Ground
No Connect
PIN ASSIGNMENTA16
PIN #
1
2
3
4
5
6
7
8
9
10
11
12
SYMBOL
GND
NC
A
0
A
1
A
2
WE
L
CS
2
D
4
D
5
D
6
D
7
GND
PIN #
13
14
15
16
17
18
19
20
21
22
23
24
SYMBOL
A
9
A
10
A
11
A
12
A
13
WE
U
CS
4
D
12
D
13
D
14
D
15
Vcc
PIN #
25
26
27
28
29
30
31
32
33
34
35
36
SYMBOL
GND
NC
A
17
A
16
A
15
A
14
CS
3
D
11
D
10
D
9
D
8
Vcc
PIN #
37
38
39
40
41
42
43
44
45
46
47
48
SYMBOL
A
8
A
7
A
6
A
5
A
4
A
3
CS
1
D
3
D
2
D
1
D
0
Vcc
MODULE OPTIONS
DIP: AK616256D
EXAMPLES
AK616256D-12
256K x 16, 12 nSEC SRAM Module, DIP
AK616256D-15
256K x 16, 15nSEC SRAM Module, DIP
ACCUTEK [ ACCUTEK MICROCIRCUIT CORPORATION ]
