6.42

71321SA/LA and 71421SA/LA

High Speed 2K x 8 Dual-Port Static RAM with Interrupts

Industrial and Commercial Temperature Ranges

2

Pin Configurations(1,2,3)

Description

The IDT71321/IDT71421 are high-speed 2K x 8 Dual-Port Static

RAMs with internal interrupt logic for interprocessor communications.

The IDT71321 is designed to be used as a stand-alone 8-bit Dual-

Port Static RAM or as a "MASTER" Dual-Port Static RAM together

with the IDT71421 "SLAVE" Dual-Port in 16-bit-or-more word width

systems. Using the IDT MASTER/SLAVE Dual-Port Static RAM ap-

proach in 16-or-more-bit memory system applications results in full

speed, error-free operation without the need for additional discrete

logic.

Both devices provide two independent ports with separate control,

address, and I/O pins that permit independent, asynchronous access

for reads or writes to any location in memory. An automatic power

down feature, controlled by CE, permits the on chip circuitry of each

port to enter a very low standby power mode.

Fabricated using CMOS high-performance technology, these de-

vices typically operate on only 325mW of power. Low-power (LA)

versions offer battery backup data retention capability, with each Dual-

Port typically consuming 200µW from a 2V battery.

The IDT71321/IDT71421 devices are packaged in 52-pin PLCC,

52-pin STQFP, 64-pin TQFP, and 64-pin STQFP.

NOTES:

1. All VCC pins must be connected to power supply.

2. All GND pins must be connected to ground supply.

3. PLG52 package body is approximately .75 in x .75 in x .17 in.

PNG64 package body is approximately 14mm x 14mm x 1.4mm.

PPG64 package body is approximately 10mm x 10mm x 1.4mm.

4. This package code is used to reference the package diagram.

71321/421

PLG52(4)

4L

I/O

5L

I/O

6L

I/O

7L

I/O

NC

GND

I/O 0R

I/O 1R

I/O 2R

I/O 3R

I/O 4R

I/O 5R

I/O 6R

A0L

OEL

A10L

INTL

BUSYL

R/

WL

CEL

VCC

CER

R/

WR

BUSYR

INTR

A10R

1

2

3

4

5

6

7

47

48

49

50

51

52

9 8

10

11

12

13

14

15

16

17

18

19

20

27

26

25

24

23

22

21

33

32

31

30

29

28

35

34

36 37 38 39 40 41 42 43 44 45 46

2691 drw 02

PLCC

Top View

71321/421

PNG64/PPG64(4)

8 9 10 11 12 13 14 15 16

1 2 3 4 5 6 7

46 45444342 41 40 39 38 3736 3534

47

48

33

2691 drw 03

17

18

19

20

32

31

30

29

28

27

26

25

24

23

22

21

49

50

51

52

63

62

61

60

59

58

57

56

55

54

53

64

N/C

A10R

N/C

N/C

A10L

N/C

GND

N/C

N/C

GND

N/C

R/

WR

CER

VCC

VCC

BUSYL

INTL

I/O3L

I/O4L

I/O5L

I/O6L

I/O7L

I/O0R

I/O1R

I/O2R

I/O3R

I/O4R

I/O5R

R/

WL

CEL

BUSYR

INTR

64-Pin TQFP

64-Pin STQFP

Top View