View mc74hct138a datasheet:

MOTOROLA SEMICONDUCTOR TECHNICAL DATA MC74HCT138A 1-of-8 Decoder/Demultiplexer with LSTTL Compatible Inputs High–Performance Silicon–Gate CMOS N SUFFIX PLASTIC PACKAGE 16 The MC74HCT138A is identical in pinout to the LS138. The HCT138A CASE 648–08 1 may be used as a level converter for interfacing TTL or NMOS outputs to High Speed CMOS inputs. D SUFFIX The HCT138A decodes a three–bit Address to one–of–eight active–lot SOIC PACKAGE 16 outputs. This device features three Chip Select inputs, two active–low and CASE 751B–05 1 one active–high to facilitate the demultiplexing, cascading, and chip–select- ing functions. The demultiplexing function is accomplished by using the DT SUFFIX Address inputs to select the desired device output; one of the Chip Selects is 16 TSSOP