The CD74AC139 and CD74ACT139 are dual 2-to-4-line decoders/demultiplexers that utilize the Harris Advanced CMOS Logic technology. These devices contain two independent binary to one-of-four decoders, each with a single active LOW enable input (1E or 2E). Data on the select inputs (1A0 and 1A1 or 2A0 and 2A1) cause one of the four normally HIGH outputs to go LOW.