The LSTTL/MSI 74LS139 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 74LS139 can be used as a function generator providing all four minterms of two variables. The 74LS139 is fabricated with the Schottky barrier diode process for high speed.

Features:
Schottky Process for High Speed
Multifunction Capability
Two Completely Independent 1-of-4 Decoders
Active Low Mutually Exclusive Outputs
Input Clamp Diodes Limit High Speed Termination Effects
ESD > 3500 Volts

SOIC 16 package. Actual brand may vary from picture.
A11145S