54AC139 • 54ACT139
Dual 1-of-4 Decoder/Demultiplexer
General Description
The ’AC/’ACT139 is a high-speed, dual 1-of-4 decoder/
demultiplexer. The device has two independent decoders,
each accepting two inputs and providing four
mutually-exclusive active-LOW outputs. Each decoder has
an active-LOW Enable input which can be used as a data in-
put for a 4-output demultiplexer. Each half of the ’AC/
’ACT139 can be used as a function generator providing all
four minterms of two variables.
Features
n I
CC
reduced by 50%
n Multifunction capability
n Two completely independent 1-of-4 decoders
n Active LOW mutually exclusive outputs
n Outputs source/sink 24 mA
n ’ACT139 has TTL-compatible inputs
n Standard Military Drawing (SMD)
— ’AC139: 5962-87623
— ’ACT139: 5962-87553
Logic Symbols
Pin Names Description
A
0
,A
1
Address Inputs
E Enable Inputs
O
0
–O
3
Outputs
FACT
®
is a registered trademark of Fairchild Semiconductor Corporation.
DS100269-8
DS100269-1
IEEE/IEC
DS100269-2
August 1998
54AC139
•
54ACT139
Dual
1-of-4
Decoder/Demultiplexer
© 1998 National Semiconductor Corporation DS100269 www.national.com