View mc74hc138 datasheet:

MOTOROLA SEMICONDUCTOR TECHNICAL DATA MC54/74HC138A 1-of-8 Decoder/Demultiplexer High–Performance Silicon–Gate CMOS The MC54/74HC138A is identical in pinout to the LS138. The device J SUFFIX inputs are compatible with standard CMOS outputs; with pullup resistors, CERAMIC PACKAGE they are compatible with LSTTL outputs. 16 CASE 620–10 The HC138A decodes a three–bit Address to one–of–eight active–low 1 outputs. This device features three Chip Select inputs, two active–low and one active–high to facilitate the demultiplexing, cascading, and chip–select- ing functions. The demultiplexing function is accomplished by using the N SUFFIX Address inputs to select the desired device output; one of the Chip Selects is PLASTIC PACKAGE 16 used as a data input while the other Chip Se