IC Logic, 3 to 8 Line Inverter Decoder, DIP - 

The M74HC138 is an high speed CMOS 3 TO 8 Line decoder fabricated with silicon gate C²MOS technology. If the device is enabled, 3 binary select inputs (A, B, and C) determine which one of the outputs will go low), If enable input G1 is held low or either G2A or G2B is held, high, the decoding function is inhibited and all the 8 Outputs go high. Three enables inputs are provided to ease cascade connection and application of address decoders for memory systems. All inputs are equipped with protection circuits against discharge and transient excess voltage.