The 74HC139 are high-speed Si-gate CMOS devicesand are pin compatible with low power Schottky TTL(LSTTL). The 74HC139 are high-speed, dual 2-to-4 linedecoder/multiplexers. This device has two independentdecoders, 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 74HC139 is identical to the HEF4556 of the HE4000Bfamily.

Features:
Demultiplexing capability
Two independent 2-to-4 decoders
Multifunction capability
Active LOW mutually exclusive outputs
Output capability: standard
ICC category: MSI

SOIC 16 package. Actual brand may vary from picture.
G350S