The MC74HCT138AN is identical in pinout to the LS138. The MC74HCT138AN may be used as a level converter for interfacing TTL or NMOS outputs to High Speed CMOS inputs. The MC74HCT138AN decodes a three-bit Address to one-of-eight active-lot 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.
Output Drive Capability: 10 LSTTL Loads
TTL/NMOS Compatible Input Levels
Outputs Directly Interface to CMOS, NMOS, and TTL
Operating Voltage Range: 4.5 to 5.5 V
Low Input Current: 1.0 ľA
122 FETs or 30.5 Equivalent Gates
Datasheet Available:Motorola MC74HCT138AN
16 pin DIP. Manufactured by Motorola.