TRUTH TABLE

WE

OE

MODE

SUPPLY CURRENT

NOTE

H

X

X

X

Deselect

High-Z

X

L

X

X

Deselect

High-Z

L

H

L

X

Write

L

H

H

L

Read

L

H

H

H

Output disable

High-Z

NOTE:

1.

X = H or L

25

24

2

11

15

18

5164A-2

MEMORY

ARRAY

(256 x 256)

13

17

12

16

WE

27

I/O

CIRCUITS

COLUMN DECODERS

GND

OE

22

19

COLUMN ADDRESS

BUFFER

10

21

9

8

28

14

26

DATA CONTROL

23

NOTE: Pin numbers apply to 28-pin DIP, SK-DIP, or SOP.

Figure 3. LH5164A/AH Block Diagram

PIN DESCRIPTION

SIGNAL

PIN NAME

Address inputs

Chip Enable input

WE

Write Enable input

OE

Output Enable input

SIGNAL

PIN NAME

Data inputs and outputs

Power supply

GND

Ground

NC

No connection

LH5164A/AH

CMOS 64K (8K

× 8) Static RAM

2