54ACT139

www.DataSheet4U.com 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 ...