74F640
Overview
These devices are octal bus transceivers designed for asynchronous two-way data flow between the A and B busses. Both busses are capable of sinking 64 mA, have 3STATE outputs, and a common output enable pin.
- 74F645 Unit Loading/Fan Out Pin Names OE T/R A0-A7 B0-B7 Description Output Enable Input (Active LOW) Transmit/Receive Input Side A Inputs or 3-STATE Outputs Side B Inputs or 3-STATE Outputs U.L. HIGH/LOW 1.0/1.0 1.0/1.0 3.5/0.667 600/106.6 3.5/0.667 600/106.6 Input IIH/IIL Output IOH/IOL 20 µA/-0.6 mA 20 µA/-0.6 mA 70 µA/-0.4 mA -12 mA/64 mA 70 µA/-0.4 mA -12 mA/64 mA Functional Description The output enable (OE) is active LOW. If the device is disabled (OE HIGH), the outputs are in the high impedance state. The transmit/receive input (T/R) controls whether data is transmitted from the
