The 74F139 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 74F139 can be used as a function generator providing all four minterms of two variables.
Two completely independent 1-of-4 decoders
Active LOW mutually exclusive outputs
16 pin DIP. Actual brand may vary from picture.