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54ACT399 Quad 2-Port Register

August 1998

54ACT399

Quad 2-Port Register

General Description

The 鈥橝C/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

n

n

n

n

I

CC

reduced by 50%

Select inputs from two data sources

Fully positive edge-triggered operation

Outputs source/sink 24 mA

ACT399 has TTL-compatible inputs

Logic Symbols

Connection Diagrams

Pin Assignment

for DIP and Flatpak

DS100356-1

IEEE/IEC

DS100356-3

Pin Assignment

for LCC

DS100356-5

DS100356-2

Pin Names

S

CP

I

0a

鈥揑

0d

I

1a

鈥揑

1d

Q

a

鈥換

d

Description

Common Select Input

Clock Pulse Input

Data Inputs from Source 0

Data Inputs from Source 1

Register True Outputs

TRI-STATE

廬

is a registered trademark of National Semiconductor Corporation.

FACT

廬

is a registered trademark of Fairchild Semiconductor Corporation.

漏 1998 National Semiconductor Corporation

DS100356

www.national.com

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