AK632256Z datasheet(1/2 Pages) ACCUTEK

Part #	AK632256Z

Description	262,144 x 32 Bit CMOS/BiCMOS Static Random Access Memory

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Manufacturer	ACCUTEK [ACCUTEK MICROCIRCUIT CORPORATION]

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DESCRIPTION

The Accutek AK632256 SRAM Module consists of eight fast high

performance SRAMs mounted on a low profile, 64 pin SIM or ZIP

Board. The module utilizes four 28 pin 256K x 4 SRAMs in SOJ

packages and four decoupling capacitors mounted on each side of

a printed circuit board.

The SRAMs used have common I/O functions and single output en-

able functions. Also, four separate chip select (CE) connections are

used to independently enable the four bytes. The modules can be

supplied in a variety of access time values from 12 nSEC to

45 nSEC in CMOS or BiCMOS technology.

The Accutek module is designed to have a maximum seated height

of 0.680 inch SIM or 0.540 inch ZIP to provide for the lowest height

off the board. By offset-mounting the back surface SRAMs on the

SIM version, the module can be mounted in either angled or

straight-up SIM sockets. Each conforms to JEDEC standard sizes

and pin-out configurations. Using two pins for module memory den-

sity identification, PD0 and PD1, minimizes interchangeability and

design considerations when changing from one module size to an-

other in customer applications.

FEATURES

· 262,144 x 32 bit organization

· JEDEC Standardized 64 pin SIM or ZIP format

· Common I/O, single OE functions with four separate chip

selects (CE)

· Low height, 0.680 inch SIM or 0.540 inch ZIP maximum

· Upward compatible with 512K x 32 (AK532512) and

1 Meg x 32 (AK6321024)

· Downward compatible with 32K x 32 (AK63232), 64K x 32

(AK63264) and 128K x 32 (AK632128)

· Presence Detect PD0 and PD1 for identifying module density

· Fast access times range from 12 nSEC BiCMOS to 45 nSEC

CMOS

· TTL-compatible inputs and outputs

· Single 5 volt power supply - AK632256W, AK632256Z

· Single 3.3 volt power supply - AK632256W/3.3,

AK632256Z/3.3

· Operating temperature range in free air, 0

0Cto700C

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 indus-

try-compatible 256K x 4 SRAMs from several semiconductor manu-

facturers.

Accutek

Microcircuit

Corporation

AK632256W / AK632256Z

262,144 x 32 Bit CMOS/BiCMOS

Static Random Access Memory

64-Pin ZIP

64-Pin SIM

Front View

1

32

33

64

PIN NOMENCLATURE

A0 -A17

Address Inputs

CE1 -CE4

Chip Enable

DQ1 -DQ32

Data In/Data Out

OE

Output Enable

PD0 -PD1

Presence Detect

Vcc

Power Supply

Vss

Ground

WE

Write Enable

MODULE OPTIONS

Leadless SIM: AK632256W

Leaded SIP: AK632256G

Leaded ZIP: AK632256Z

PIN ASSIGNMENT

PIN #

SYMBOL

PIN #

SYMBOL

PIN #

SYMBOL

PIN #

SYMBOL

1

Vss

17

A2

33

CE4

49

A4

2PD0

18

A9

34

CE3

50

A11

3PD1

19

DQ13

35

A17

51

A5

4DQ1

20

DQ5

36

A16

52

A12

5DQ9

21

DQ14

37

OE

53

Vcc

6DQ2

22

DQ6

38

Vss

54

A13

7DQ10

23

DQ15

39

DQ25

55

A6

8DQ3

24

DQ7

40

DQ17

56

DQ21

9DQ11

25

DQ16

41

DQ26

57

DQ29

10

DQ4

26

DQ8

42

DQ18

58

DQ22

11

DQ12

27

Vss

43

DQ27

59

DQ30

12

Vcc

28

WE

44

DQ19

60

DQ23

13

A0

29

A15

45

DQ28

61

DQ31

14

A7

30

A14

46

DQ20

62

DQ24

15

A1

31

CE2

47

A3

63

DQ32

16

A8

32

CE1

48

A10

64

Vss

PD0 = Vss

PD1 = Vss

FUNCTIONAL DIAGRAM

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AK632256Z Datasheet(PDF) 1 Page - ACCUTEK MICROCIRCUIT CORPORATION

AK632256Z Datasheet(HTML) 1 Page - ACCUTEK MICROCIRCUIT CORPORATION

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