Octal 3-State Bus TransceiverThe IN74AC643 is identical in pinout to the LS/ALS643,
HC/HCT643. The device inputs are compatible with standard CMOS
outputs; with pullup resistors, they are compatible with LS/ALS
outputs.
The IN74AC643 is a 3-state transceiver that is used for 2-way
asynchronous Communication between data buses. The device has an
active-low Output Enable pin, which is used to place the I/O ports
into high-impedance states. The Direction control determines
whether data flows from A to B or from B to A. By Integral Corp.
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