SN54/74HCT CMOS LOGIC FAMILY APPLICATIONS AND RESTRICTIONS

The TI SN54/74HCT family of CMOS devices is a subgroup of the SN74HC series with the HCT circuitry modified to meet the interfacing requirements of TTL outputs to high-speed CMOS inputs. The HCT devices can be driven by the TTL circuits directly without additional components. This document describes the TTL/HC interface, the operating voltages, circuit noise, and power consumption. A Bergeron analysis is provided for the SN74ALS245 driver.

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