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National Semiconductor Electronic Components Datasheet

54ABT16646 Datasheet

16-Bit Transceivers and Registers with TRI-STATE Outputs

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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 se-
lect controls can multiplex stored and real-time (transparent
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 regis-
ter.
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
CPABn, CPBAn
SABn, SBAn
OEn
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.
© 1998 National Semiconductor Corporation DS100226
PrintDate=1998/07/14 PrintTime=11:10:43 43606 ds100226 Rev. No. 1 cmserv Proof
www.national.com
1
1


National Semiconductor Electronic Components Datasheet

54ABT16646 Datasheet

16-Bit Transceivers and Registers with TRI-STATE Outputs

No Preview Available !

Connection Diagram
Pin Assignment for Cerpack
Real Time Transfer
A-Bus to B-Bus
DS100226-3
FIGURE 1.
Real Time Transfer
B-Bus to A-Bus
DS100226-4
FIGURE 2.
DS100226-2
Storage from
Bus to Register
DS100226-5
FIGURE 3.
Transfer from
Register to Bus
DS100226-6
FIGURE 4.
www.national.com
2
PrintDate=1998/07/14 PrintTime=11:10:43 43606 ds100226 Rev. No. 1 cmserv Proof
2


Part Number 54ABT16646
Description 16-Bit Transceivers and Registers with TRI-STATE Outputs
Maker National Semiconductor
Total Page 10 Pages
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