GENERAL
These family specifications cover the common electrical ratings and characteristics of the entire HCMOS 74HC/HCT/HCU family, unless otherwise specified in the individual device data sheet.

INTRODUCTION
The 74HC/HCT/HCU high-speed Si-gate CMOS logic family combines the low power advantages of the HE4000B family with the high speed and drive capability of the low power Schottky TTL (LSTTL).

The family will have the same pin-out as the 74 series and provide the same circuit functions.

In these families are included several HE4000B family circuits which do not have TTL counterparts, and some special circuits.
The basic family of buffered devices, designated as XX74HCXXXXX, will operate at CMOS input logic levels for high noise immunity, negligible typical quiescent supply and input current. It is operated from a power supply of 2 to 6 V.