June 1991

Revised January 1999

© 1999 Fairchild Semiconductor Corporation

DS010937.prf

www.fairchildsemi.com

74ACTQ16646

16-Bit Transceiver/Register with 3-STATE Outputs

General Description

The ACTQ16646 contains sixteen non-inverting bidirec-

tional registered bus transceivers providing multiplexed

transmission of data directly from the input bus or from the

internal storage registers. Each byte has separate control

inputs which can be shorted together for full 16-bit opera-

tion. The DIR inputs determine the direction of data flow

through the device. The CPAB and CPBA inputs load data

into the registers on the LOW-to-HIGH transition. The

ACTQ16646 utilizes Fairchild Quiet Series

™ technology to

guarantee quiet output switching and improved dynamic

threshold performance. FACT Quiet Series

™ features

GTO

™ output control and undershoot corrector for superior

performance.

Features

s Utilizes Fairchild FACT Quiet Series technology

s Guaranteed simultaneous switching noise level and

dynamic threshold performance

s Guaranteed pin-to-pin output skew

s Independent registers for A and B buses

s Multiplexed real-time and stored data transfers

s Separate control logic for each byte

s 16-bit version of the ACTQ646

s Outputs source/sink 24 mA

s Additional specs for Multiple Output Switching

s Output loading specs for both 50 pF and 250 pF loads

Ordering Code:

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

Logic Symbol

Connection Diagram

Pin Assignment for

SSOP and TSSOP

FACT

™, Quiet Series™, FACT Quiet Series™ and GTO™ are trademarks of Fairchild Semiconductor Corporation.

Order Number

Package Number

Package Description

74ACTQ16646SSC

MS56A

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

74ACTQ16646MTD

MTD56

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