This document describes the methods and requirements for interfacing with MM74HC high-speed CMOS logic. The MM74HC series logic can be interfaced with other logic families, including 74LS TTL, MM74C, CD4000 CMOS, and 10000 ECL logic. Interfacing with TTL logic is very simple.
This document provides guidance on interfacing MM74HC high-speed CMOS logic with other logic families and control circuitry. It covers interfacing at the same supply voltage, such as connecting to 74LS TTL, CD4000 CMOS, and ECL logic, as well as interfacing to circuitry operating on different voltages which may require level translation.
The high-speed CMOS family can operate from a 2 to 6V supply.
A standard MM74HC output has a fanout capability of driving 10 LSTTL equivalent load.
High-speed CMOS's logic '1' input level is specified at 3.5V when the supply is 5.0V.