54ABT16646 Datasheet, PDF (1/8 Pages) National Semiconductor (TI) – 16-Bit Transceivers and Registers with TRI-STATE Outputs

July 1998
54ABT16646
16-Bit Transceivers and Registers with TRI-STATE^®
Outputs
General Description
The ’ABT16646 consists of bus transceiver circuits with
TRI-STATE, D-type flip-flops, and control circuitry arranged
for multiplexed transmission of data directly from the input
bus or from the internal registers. Data on the A or B bus will
be clocked into the registers as the appropriate clock pin
goes to a high logic level. Control OE and direction pins are
provided to control the transceiver function. In the trans-
ceiver mode, data present at the high impedance port may
be stored in either the A or the B register or in both. The
select controls can multiplex stored and real-time (transpar-
ent mode) data. The direction control determines which bus
will receive data when the enable control OE is Active LOW.
In the isolation mode (control OE HIGH), A data may be
stored in the B register and/or B data may be stored in the A
register.
Features
n Independent registers for A and B buses
n Multiplexed real-time and stored data
n A and B output sink capability of 48 mA, source
capability of 24 mA
n Guaranteed latchup protection
n High impedance glitch free bus loading during entire
power up and power down cycle
n Nondestructive hot insertion capability
n Standard Microcircuit Drawing (SMD) 5962-9450202
Ordering Code
Military
54ABT16646W-QML
Logic Symbol
Package
Number
WA56A
56-Lead Cerpack
Package Description
DS100226-1
Pin Names
A₀– A₁₅
B₀– B₁₅
CPAB_n, CPBA_n
SAB_n, SBA_n
OE_n
DIR
Description
Data Register A Inputs/
TRI-STATE Outputs
Data Register B Inputs/
TRI-STATE Outputs
Clock Pulse Inputs
Select Inputs
Output Enable Input
Direction Control Input
TRI-STATE^® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS100226
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