HD74HC640/HD74HC643 Octal Bus Transceivers (with 3-state outputs) Description Each device has an active enable G and a direction control input, DIR.
when DIR is high, data flows from the A inputs to the B outputs.
When DIR is low, data flows from the B inputs to the A outputs.
The HD74HC640 transfers inverted data from one bus to other and the HD74HC643 transfers inverted data from the A bus to the B bus and true data from the B bus to the A bus.
Features • • • • • High Speed Operation: tpd = 12 ns typ (CL = 50 pF) High Output Current: Fanout of 15 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C...

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