KK74AC139 Overview
Dual 1-of-4 Decoder/Demultiplexer High-Speed Silicon-Gate CMOS KK74AC139 The KK74AC139 is identical in pinout to the LS/ALS139, HC/HCT139. The device inputs are patible with standard CMOS outputs; with pullup resistors, they are patible with LS/ALS outputs.