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Text: # Dual 2 -to -4 -lin e Decoders/D em ultiplexers The HD 74HC139 contains two independent two-to-four-line decoders each with a single active low enable input 1G, or PIN ARRANGEMENT 2G . Data on the select inputs (1A, and 1B or 2A, and 2B) cause one of the four normally high outputs to go low.