HD74HC640 transceivers equivalent, octal bus transceivers.
* 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 Inpu.
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.
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