FEATURES

· Demultiplexing capability

· Two independent 2-to-4 decoders

· Multifunction capability

· Active LOW mutually exclusive outputs

· Output capability: standard

· ICC category: MSI

GENERAL DESCRIPTION

The 74HC/HCT139 are high-speed Si-gate CMOS devices

and are pin compatible with low power Schottky TTL

(LSTTL). It is specified in compliance with JEDEC

standard no. 7A.

The 74HC/HCT139 are high-speed, dual 2-to-4 line

decoder/multiplexers. This device has two independent

decoders, each accepting two binary weighted inputs

(nA0 and nA1) and providing four mutually exclusive active

LOW outputs (nY0 to nY3). Each decoder has an active

LOW enable input (nE).

When nE is HIGH, every output is forced HIGH. The

enable can be used as the data input for a 1-to-4

demultiplexer application.

The “139” is identical to the HEF4556 of the HE4000B

family.