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PDF SYS32256ZK-15 Data sheet ( Hoja de datos )

Número de pieza SYS32256ZK-15
Descripción 256K x 32 SRAM MODULE
Fabricantes MOSAIC 
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256K x 32 SRAM MODULE
SYS32256ZK/LK - 12/15/17
Issue 1.1 : January 1999
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.
Features
Access Times of 12/15/17 ns.
64 Pin ZIP & SIMM pinouts.
5 Volt Supply ± 10%.
Power Dissipation :
Operating (32bit mode)
Standby (CMOS) -L
9.0 W (maximum).
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.
Block Diagram
A0-A17
OE
WE
CS1
CS2
CS3
CS4
256Kx4
SRAM
D0-D3
256Kx4
SRAM D8-D11
256Kx4
SRAM D16-D19
256Kx4
SRAM D24-D27
256Kx4
SRAM D4-D7
256Kx4
SRAM
D12-D15
256Kx4
SRAM D20-D23
256Kx4
SRAM
D28-D31
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
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
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
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
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
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
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

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