WS256K64-25G4WM datasheet(1/5 Pages) ETC

Part #	WS256K64-25G4WM

Description	256Kx64 SRAM MODULE

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White Microelectronics • Phoenix, AZ • (602) 437-1520

4

1

256Kx64 SRAM MODULE ADVANCED*

FEATURES

s Access Times 20, 25, 35ns

s MIL-STD-883 Compliant Devices Available

s Packaging:

• 116 lead, 40mm, Hermetic CQFP (Package 504)

s Organized as 256Kx64, User Configurable as 512Kx32 or

1Mx16.

s Data I/O Compatible with 3.3V devices

s 2V Data Retention devices available

s Commercial, Industrial and Military Temperature Range

s 5 Volt Power Supply

s Low Power CMOS

s TTL Compatible Inputs and Outputs

s 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.

FIG. 1 PIN CONFIGURATION FOR WS256K64-XG4WX

BLOCK DIAGRAM

TOP VIEW

PIN DESCRIPTION

I/O0-63 Data Inputs/Outputs

A0-17

Address Inputs

WE1-4

Write Enables

CS1-4

Chip Selects

OE

Output Enable

VCC

Power Supply

GND

Ground

256K x 16

16

I/O 0-15

CS1

256K x 16

16

I/O 16-31

CS2

16

I/O 32-47

CS3

256K x 16

16

I/O 48-63

CS4

A 0-17

OE

WE1

WE2

WE3

WE4

256K x 16

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

I/O3

I/O4

I/O5

I/O6

I/O7

GND

I/O8

I/O9

I/O10

I/O11

I/O12

I/O13

I/O14

I/O15

GND

I/O16

I/O17

I/O18

I/O19

I/O20

I/O21

I/O22

I/O23

GND

I/O24

I/O25

I/O26

I/O27

I/O28

I/O60

I/O59

I/O58

I/O57

I/O56

GND

I/O55

I/O54

I/O53

I/O52

I/O51

I/O50

I/O49

I/O48

GND

I/O47

I/O46

I/O45

I/O44

I/O43

I/O42

I/O41

I/O40

GND

I/O39

I/O38

I/O37

I/O36

I/O35

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

WS256K64-XG4WX

September 1998

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