The MC74HC138ADR2G is a 1-of-8 Decoder/Demultiplexer, identical in pinout to the LS138. The device inputs are compatible with standard CMOS outputs, with pull-up resistors, it is compatible with LSTTL outputs. The HC138A decodes a three-bit address to one-of-eight active-low outputs. This device features three chip select inputs, two active-low and one active-high to facilitate the demultiplexing, cascading and chip-selecting functions. The demultiplexing function is accomplished by using the address inputs to select the desired device output, one of the chip selects is used as a data input while the other chip selects are held in their active states.
10 LSTTL Loads output drive capability
Outputs directly interface to CMOS, NMOS and TTL
1A Low input current
High noise immunity characteristic of CMOS devices
