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PI74FCT2543T

Fast CMOS Latched Transceivers

Pericom Semiconductor 

PI74FCT543T/544T

(25Ω Series) PI74FCT2543T

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PI74FCT543/544/2543T Product Pin Configuration

24-PIN

P24

Q24

R24

S24

Product Pin Description

Pin Name

OEAB

OEBA

CEAB

CEBA

LEAB

LEBA

A0-A7

B0-B7

GND

VCC

Description

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

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

A-to-B Enable Input (Active LOW)

B-to-A Enable Input (Active LOW)

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

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

Ground

Power

PI74FCT543/2543T Truth Table (Non-Inverting)(1,2)

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

Inputs

CEAB LEAB OEAB

Latch

Status

A-to-B

Output

Buffers

B0–B7

H

—

—

Storing

High-Z

—

H

—

Storing

—

—

—

H

L

L

L

L

H

L

—

Transparent

Storing

High Z

Current A Inputs

Previous* A Inputs

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.

2

PS2020A 03/11/96

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