器件名称: 54ACT139
功能描述: Dual 1-of-4 Decoder/Demultiplexer
文件大小: 172.3KB 共8页
简 介:54AC139 54ACT139 Dual 1-of-4 Decoder/Demultiplexer
August 1998
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 input 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. n n n n n n Multifunction capability Two completely independent 1-of-4 decoders Active LOW mutually exclusive outputs Outputs source/sink 24 mA ’ACT139 has TTL-compatible inputs Standard Military Drawing (SMD) — ’AC139: 5962-87623 — ’ACT139: 5962-87553
Features
n ICC reduced by 50%
Logic Symbols
IEEE/IEC
DS100269-8 DS100269-2
Pin Names A0, A1 E O0–O3
Description Address Inputs Enable Inputs Outputs
DS100269-1
FACT is a registered trademark of Fairchild Semiconductor Corporation.
1998 National Semiconductor Corporation
DS100269
www.national.com
Connection Diagrams
Pin Assignment for DIP and Flatpak can be used as the data input for a 4-output demultiplexer application. Each half of the ’AC/’ACT139 generates all four minterms of two variables. These four minterms are useful in some applications, replacing multiple gate functions as shown in , and thereby reducing the number of packages required in a logic network.
DS1002……
