54ABT16646 16-Bit Transceivers and Registers with TRI-STATE Outputs
July 1998
54ABT16646
16-Bit Transceivers and Registers with TRI-STATE
廬
Outputs
General Description
The 鈥橝BT16646 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
Package
Number
WA56A
56-Lead Cerpack
Pin Names
A
0
鈥揂
15
B
0
鈥揃
15
CPAB
n
, CPBA
n
SAB
n
, SBA
n
OE
n
DIR
DS100226-1
Package Description
Logic Symbol
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
廬
is a registered trademark of National Semiconductor Corporation.
漏 2004 National Semiconductor Corporation
DS100226
www.national.com
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