256K x 32 SRAM MODULE
SYS32256ZK/LK - 12/15/17
11403 West Bernado Court, Suite 100, San Diego, CA 92127.
Tel No: (619) 674 2233, Fax No: (619) 674 2230
Issue 1.1 : January 1999
Features
•
•
•
•
Access Times of 12/15/17 ns.
64 Pin ZIP & SIMM pinouts.
5 Volt Supply ± 10%.
Power Dissipation :
Operating (32bit mode) 9.0 W (maximum).
Standby (CMOS) -L
1.3 W (maximum).
Completely Static Operation.
Equal Access and Cycle Times.
All Inputs and Outputs Directly TTL Compatible.
On-board Supply Decoupling Capacitors.
72 pin SIMM (SYS32256LKX) available.
Description
The SYS32256 is a plastic 8Mbit Static RAM
Module offered in Industry Standard 64 pin ZIP and
64 lead SIMM package, organised as 256K x 32.
The module utilises eight fast 256K x 4 SRAMs
housed in SOJ packages, and uses double sided
surface mount techniques, to achieve a very high
density module.
Four chip selects are used to independently enable
the four bytes. Reading or Writing is executed on
individual or any combination of multiple bytes.
Two pins PD0 & PD1 are used to identify module
memory density where alternative versions of the
JEDEC standard modules can be interchanged.
Block Diagram
A0-A17
OE
WE
256Kx4
SRAM
•
•
•
•
•
Pin Definition
ZIP
PD0
D0
D1
D2
D3
Vcc
A7
A8
A9
D4
D5
D6
D7
WE
A14
CS1
CS3
A16
GND
D16
D17
D18
D19
A10
A11
A12
A13
D20
D21
D22
D23
GND
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
51
53
55
57
59
61
63
GND
PD1
D8
D9
D10
D11
A0
A1
A2
D12
D13
D14
D15
GND
A15
CS2
CS4
A17
OE
D24
D25
D26
D27
A3
A4
A5
VCC
A6
D28
D29
D30
D31
Gnd
PD0
PD1
D0
D8
D1
D9
D2
D10
D3
D11
Vcc
A0
A7
A1
A8
A2
A9
D12
D4
D13
D5
D14
D6
D15
D7
Gnd
WE
A15
A14
CS2
CS1
SIMM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
D0-D3
256Kx4
SRAM
D4-D7
CS1
256Kx4
SRAM
D8-D11
256Kx4
SRAM
D12-D15
CS2
256Kx4
SRAM
D16-D19
256Kx4
SRAM
D20-D23
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
64
CS3
256Kx4
SRAM
D24-D27
256Kx4
SRAM
D28-D31
CS4
Pin Functions
Address Inputs
Data Input/Output
Chip Select
Write Enable
Output Enable
Presence Detect
Power (+5V)
Ground
A0 ~ A17
D0 ~ D31
CS1~4
WE
OE
PD0~1
V
CC
GND
CS4
CS3
A17
A16
OE
Gnd
D24
D16
D25
D17
D26
D18
D27
D19
A3
A10
A4
A11
A5
A12
Vcc
A13
A6
D20
D28
D21
D29
D22
D30
D23
D31
Gnd
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
Package Details
Plastic 64 Pin ZIP
Plastic 64 Pin SIMM
ISSUE 1.1 January 1999
SYS32256ZK/LK - 12/15/17
Package Information
Dimensions in mm
Plastic 64 Pin Zig-Zag-In-line Package (ZIP)
92.71
8.89 Max.
15.49 MAX
Pin 1
2.54 typ.
6.35typ
2.54 typ.
3.80 MIN
Plastic 64 Pin Single In-line Memory Module (SIMM)
97.92
5.59
91.03
10.16
48.90
Ordering Information
SYS32256ZK/LKLI - 012
Speed
12
15
17
Blank
I
Blank
L
ZK
LK
32256
SYS
= 12 ns
= 15 ns
= 17 ns
= Commercial Temp.
= Industrial Temp.
= Standard Part
= Low Power Part
= Plastic 64 Pin ZIP
= Plastic 64 Pin SIMM
= 256K X 32
= Static RAM
Temperature range
Power Consumption
Package
Organisation
Memory Type
Note :
Although this data is believed to be accurate, the information contained herein is not intended to and does not create
any warranty of merchantibility or fitness for a particular purpose.
Our products are subject to a constant process of development. Data may be changed at any time without notice.
Products are not authorised for use as critical components in life support devices without the express written approval
of a company director.
2
15.24
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