© 1999 Fairchild Semiconductor Corporation DS500345 www.fairchildsemi.com
August 1999
Revised October 1999
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74ACT16646
16-Bit Transceiver/Register with 3-STATE Outputs
General Description
The ACT16646 contains sixteen non-inverting bidirectional
registered bus transceivers providing multiplexed transmis-
sion 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 operation. The
DIR inputs determine the direction of data flow through the
device. The CPAB and CPBA inputs load data into the reg-
isters on the LOW-to-HIGH transition.
Features
a73 Independent registers for A and B buses
a73 Multiplexed real-time and stored data transfers
a73 Separate control logic for each byte
a73 16-bit version of the ACT646
a73 Outputs source/sink 24 mA
a73 TTL-compatible inputs

Ordering Code:
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Logic Symbol Connection Diagram
FACT is a trademark of Fairchild Semiconductor Corporation.
Order Number Package Number Package Description
74ACT16646SSC MS56A 56-Lead Shrink Small Outline Package (SSOP), JEDEC MO-118, 0.300” Wide
74ACT16646MTD MTD56 56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide