Octal 3-State Inverting Bus Transceiver

The SL74HC640 is identical in pinout to the LS/ALS640. The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LS/ALSTTL outputs. The SL74HC640 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 System Logic Semiconductor. co.
SL74HC640 's PackagesSL74HC640 's pdf datasheet

SL74HC640 Pinout, Pinouts
SL74HC640 pinout,Pin out
This is one package pinout of SL74HC640,If you need more pinouts please download SL74HC640's pdf datasheet.

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