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54ACT399 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. 54ACT399
Description  Quad 2-Port Register
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

54ACT399 Datasheet(HTML) 1 Page - National Semiconductor (TI)

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54ACT399
Quad 2-Port Register
General Description
The ’AC/ACT399 is the logical equivalent of a quad 2-input
multiplexer feeding into four edge-triggered flip-flops. A com-
mon Select input determines which of the two 4-bit words is
accepted. The selected data enters the flip-flop on the rising
edge of the clock.
Features
n ICC reduced by 50%
n Select inputs from two data sources
n Fully positive edge-triggered operation
n Outputs source/sink 24 mA
n ACT399 has TTL-compatible inputs
Logic Symbols
Connection Diagrams
Pin Names
Description
S
Common Select Input
CP
Clock Pulse Input
I
0a–I 0d
Data Inputs from Source 0
I
1a–I1d
Data Inputs from Source 1
Q
a–Qd
Register True Outputs
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
FACT® is a registered trademark of Fairchild Semiconductor Corporation.
DS100356-1
IEEE/IEC
DS100356-5
Pin Assignment
for DIP and Flatpak
DS100356-3
Pin Assignment
for LCC
DS100356-2
August 1998
© 1998 National Semiconductor Corporation
DS100356
www.national.com


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