Octal 3-State Inverting Bus Transceiver
High-Speed Silicon-Gate CMOS

The IN74ACT640 is identical in pinout to the LS/ALS640, HC/HCT640. The IN74ACT640 may be used as a level converter for interfacing TTL or NMOS outputs to High Speed CMOS inputs.
The IN74ACT640 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.

? TTL/NMOS Compatible Input Levels
? Outputs Directly Interface to CMOS, NMOS, and TTL
? Operating Voltage Range: 4.5 to 5.5 V
? Low Input Current: 1.0 μA; 0.1 μA @ 25°C
? Outputs Source/Sink 24 mA