MC74AC139 Datasheet | onsemi

MC74AC139, MC74ACT139 Dual 1-of-4 Decoder/Demultiplexer The MC74AC139/74ACT139 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 MC74AC139/74ACT139 can be used as a function generator providing four minterms of two variables. Features - Multifunctional Capability - Two pletely Independent 1- of- 4 Decoders - Active LOW Mutually Exclusive Outputs - Outputs Source/Sink 24 m A - ′ACT139 Has TTL patible Inputs - These are Pb- Free Devices VCC Eb A0b A1b O0b O1b O2b O3b 16 15 14 13 12 11 10 9 12345678 Ea A0a A1a O0a O1a O2a O3a GND Figure 1. Pinout: 16- Lead Packages Conductors (Top View) PIN ASSIGNMENT PIN FUNCTION A0, A1 E Address Inputs Enable Inputs O0- O3 Outputs TRUTH TABLE Inputs E A0 A1 O0 LLL LHL LLH LHH H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Outputs O1 O2 HH HH LH HL HH O3 H H H H...