2

PS2062A 01/15/97

PI74LPT543

3.3V 8-BIT LATCHED TRANSCEIVER

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Pin Name

Description

OEAB

A-to-B Output Enable Input (Active LOW)

OEBA

B-to-A Output Enable Input (Active LOW)

CEAB

A-to-B Enable Input (Active LOW)

CEBA

B-to-A Enable Input (Active LOW)

LEAB

A-to-B Latch Enable Input (Active LOW)

LEBA

B-to-A Latch Enable Input (Active LOW)

A-to-B Data Inputs or B-to-A 3-State Outputs

B-to-A Data Inputs or A-to-B 3-State Outputs

GND

Ground

Power

Product Pin Description

LEBA

OEBA

CEAB

GND

CEBA

LEAB

OEAB

24-PIN

L24

Q24

R24

S24

Product Pin Configuration

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

Latch

Output

Inputs

Status

Buffers

CEAB

LEAB

OEAB

A-to-B

H

X

X

Storing

High-Z

X

H

X

Storing

X

X

X

H

X

High Z

L

L

L

Transparent

Current A Inputs

L

H

L

Storing

Previous* A Inputs

For A-to-B (Symmetric with B-to-A)

Notes:

1.

*Before LEAB LOW-to-HIGH Transition

H = HIGH Voltage Level

L = LOW Voltage Level

X = Don't Care or Irrevelant

2.

A-to-B data flow shown; B-to-A flow control is the same,

except using CEBA, LEBA, and OEBA.