WS256K64-XG4WX
256Kx64 SRAM MODULE
FEATURES
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Access Times 20, 25, 35ns
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MIL-STD-883 Compliant Devices Available
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Packaging:
鈥?116 lead, 40mm, Hermetic CQFP (Package 504)
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Organized as 256Kx64, User Configurable as 512Kx32 or
1Mx16.
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Data I/O Compatible with 3.3V devices
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2V Data Retention devices available
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Commercial, Industrial and Military Temperature Range
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5 Volt Power Supply
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Low Power CMOS
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TTL Compatible Inputs and Outputs
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Weight
WS256K64-XG4WX - 20 grams typical
*
This data sheet describes a product that may or may not be under
development and is subject to change or cancellation without notice.
ADVANCED*
FIG. 1
PIN CONFIGURATION FOR WS256K64-XG4WX
BLOCK DIAGRAM
TOP VIEW
I/O
2
I/O
1
I/O
0
V
CC
NC
NC
NC
A
0
A
1
A
2
A
3
A
4
WE
1
CS
1
NC
NC
NC
A
5
A
6
A
7
A
8
A
9
NC
CS
4
WE
4
V
CC
I/O
63
I/O
62
I/O
61
OE
A
0-17
WE
1
CS
1
WE
2
CS
2
WE
3
CS
3
WE
4
CS
4
4
SRAM MODULES
256K x 16
256K x 16
256K x 16
256K x 16
September 1998
I/O
29
I/O
30
I/O
31
V
CC
WE
2
CS
2
NC
NC
NC
A
17
A
16
A
15
NC
NC
OE
CS
3
WE
3
A
14
A
13
A
12
A
11
A
10
NC
NC
NC
V
CC
I/O
32
I/O
33
I/O
34
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
I/O
3
I/O
4
I/O
5
I/O
6
I/O
7
GND
I/O
8
I/O
9
I/O
10
I/O
11
I/O
12
I/O
13
I/O
14
I/O
15
GND
I/O
16
I/O
17
I/O
18
I/O
19
I/O
20
I/O
21
I/O
22
I/O
23
GND
I/O
24
I/O
25
I/O
26
I/O
27
I/O
28
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
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
116
115
114
113
112
111
110
109
108
107
106
105
104
103
102
101
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
80
79
78
77
76
75
74
I/O
60
I/O
59
I/O
58
I/O
57
I/O
56
GND
I/O
55
I/O
54
I/O
53
I/O
52
I/O
51
I/O
50
I/O
49
I/O
48
GND
I/O
47
I/O
46
I/O
45
I/O
44
I/O
43
I/O
42
I/O
41
I/O
40
GND
I/O
39
I/O
38
I/O
37
I/O
36
I/O
35
16
16
16
16
I/O
0-15
I/O
16-31
I/O
32-47
I/O
48-63
PIN DESCRIPTION
I/O
0-63
Data Inputs/Outputs
A
0-17
WE
1-4
CS
1-4
OE
V
CC
GND
Address Inputs
Write Enables
Chip Selects
Output Enable
Power Supply
Ground
1
White Microelectronics 鈥?Phoenix, AZ 鈥?(602) 437-1520
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