6.42

IDT71V321/71V421S/L

High Speed 3.3V 2K x 8 Dual-Port Static RAM with Interrupts

Industrial and Commercial Temperature Ranges

2

IDT71V321/421J

52-Pin PLCC

INDEX

I/O

A

A

A

A

A

A

A

A

A

I/O

I/O

I/O

1L

2L

3L

4L

5L

6L

7L

8L

9L

0L

1L

3L

2L

A

A

A

A

A

A

A

A

A

A

NC

I/O

0R

1R

2R

3R

4R

5R

6R

7R

8R

9R

7R

1

2

3

4

5

6

747

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

3026 drw 02

,

Description

The IDT71V321/IDT71V421 are high-speed 2K x 8 Dual-Port

Static RAMs with internal interrupt logic for interprocessor communica-

tions. The IDT71V321 is designed to be used as a stand-alone 8-bit

Dual-Port RAM or as a "MASTER" Dual-Port RAM together with the

IDT71V421 "SLAVE" Dual-Port in 16-or-more-bit memory system ap-

plications results in full speed, error-free operation without the need for

additional discrete logic.

The device provides 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 IDT's CMOS high-performance technology, these

devices typically operate on only 325mW of power. Low-power (L)

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

Port typically consuming 200µW from a 2V battery.

The IDT71V321/IDT71V421 devices are packaged in a 52-pin

PLCC, a 64-pin TQFP (thin quad flatpack), and a 64-pin STQFP

(super thin quad flatpack).

INDEX

IDT71V321/421PF or TF

&

64-Pin STQFP

64-Pin TQFP

8

9

10

11

12

13

14

15

16

1

2

3

4

5

6

7

46

45

44

43

42

41

40

39

38

37

36

35

34

47

48

33

N/C

N/C

N/C

N/C

N/C

3026 drw 03

NOTES:

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

3. J52-1 package body is approximately .75 in x .75 in x .17 in.

PP64-1 package body is approximately 10mm x 10mm x 1.4mm.

PN64-1 package body is approximately 14mm x 14mm x 1.4mm.

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

5. This text does not indicate orientation of the actual part-marking.