MM74HC139 Overview
The MM74HC139 decoder utilizes advanced silicon-gate CMOS technology, and is well suited to memory address decoding or data routing applications. It possesses the high noise immunity and low power consumption usually associated with CMOS circuitry, yet has speeds parable to low power Schottky TTL logic. The MM74HC139 contain two independent one-of-four decoders each with a single active low enable input (G1, or G2).