October 1993

Revised January 1999

© 1999 Fairchild Semiconductor Corporation

DS011646.prf

www.fairchildsemi.com

74ABT16543

16-Bit Registered Transceiver with 3-STATE Outputs

General Description

The ABT16543 16-bit transceiver contains two sets of D-

type latches for temporary storage of data flowing in either

direction. Separate Latch Enable and Output Enable inputs

are provided for each register to permit independent con-

trol of inputting and outputting in either direction of data

flow. Each byte has separate control inputs, which can be

shorted together for full 16-bit operation.

Features

s Back-to-back registers for storage

s Bidirectional data path

s A and B outputs have current sourcing capability of 32

mA and current sinking capability of 64 mA

s Separate control logic for each byte

s 16-bit version of the ABT543

s Separate controls for data flow in each direction

s Guaranteed latchup protection

s High impedance glitch free bus loading during entire

power up and power down cycle

s Nondestructive hot insertion capability

Ordering Code:

Devices also available on Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Connection Diagram

Pin Assignment for SSOP and TSSOP

Pin Descriptions

Order Number

Package Number

Package Description

74ABT16543CSSC

MS56A

56-Lead Shrink Small Outline Package (SSOP), JEDEC MO-118, 0.300” Wide

74ABT16543CMTD

MTD56

56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide

Pin Names

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