74HC42

The 74HC42 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A.

The 74HC42 decoders accept four active HIGH BCD inputs and provide 10 mutually exclusive active LOW outputs. The active LOW outputs facilitate addressing other MSI circuits with active LOW input enables.

The logic design of the "42" ensures that all outputs are HIGH when binary codes greater than nine are applied to the inputs.

The most significant input (A₃) of the 74HC42 produces an useful inhibit function when the "42" is used as a 1-of-8 decoder. The A₃ input can also be used as the data input in an 8-output demultiplexer application.