2

PI74FCT543T/544T

(25

Ω

Ω

Ω

Ω

Ω Series) PI74FCT2543T

LATCHED TRANSCEIVERS

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PS2020A 03/11/96

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

PI74FCT543/544/2543T Product Pin Configuration

Latch

Output

Inputs

Status

Buffers

CEAB

LEAB

OEAB

A-to-B

H

—

—

Storing

High-Z

—

H

—

Storing

—

—

—

H

—

High Z

L

L

L

Transparent

Current A Inputs

L

H

L

Storing

Previous* A Inputs

PI74FCT543/2543T Truth Table (Non-Inverting)

(1,2)

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

1.

*Before LEAB LOW-to-HIGH Transition

H = HIGH Voltage Level

L = LOW Voltage Level

— = 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.

24-PIN

P24

Q24

R24

S24