The MC74HCT138A is identical in pinout to the LS138. The HCT138A may be used as a level converter for interfacing TTL or
NMOS outputs to High Speed CMOS inputs. The HCT138A 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.

FEATUREs
• 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 A
• In Compliance with the Requirements Defined by JEDEC Standard
No. 7A
• Chip Complexity: 122 FETs or 30.5 Equivalent Gates
• Pb−Free Packages are Available*