This document describes the features and characteristics of the M54HC7245/7640/7643/7645 and M74HC7245/7640/7643/7645 models. They are high-speed, low-power, octal bus transceivers with high noise immunity. These devices are intended for two-way asynchronous communication between data buses, and the direction of data transmission is determined by the DIR input. The HC7245/640/7643/7645 have the same pin configuration and function as the HC245/640/643 and they have a hysteresis characteristics with each input, so they can be used as a line receiver, etc.
The SGS‑Thomson M54HC7245/7640/7643/7645 series are octal bus transceivers offering both non‑inverting (HC7645) and inverting (HC7640, HC7643) functions. They feature high‑speed operation (typical propagation delay 12 ns at 5 V), low power dissipation and the ability to drive up to 15 LSTTL loads.
The document provides absolute maximum ratings, recommended operating conditions, DC and AC electrical characteristics, as well as detailed mechanical dimensions for plastic, ceramic, S‑type and PLCC packages. Legal disclaimer and company information conclude the handbook.
| Typical propagation delay (tpp) | 12 ns at Vcc = 5 V |
|---|---|
| Maximum power dissipation | 500 mW |
| Absolute maximum supply voltage | -0.5 V to +7 V |
| Output drive capability | 15 LSTTL loads |
The typical propagation delay is 12 ns when powered at 5 V.
The device can dissipate up to 500 mW.
It can drive up to 15 LSTTL loads.