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*