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These devices can be used as two 8-bit transceivers or one 16-bit transceiver. They allow data transmissionfrom the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direcTIon-control(DIR) input. The output-enable (OE) input can be used to disable the devices so that the buses areeffecTIvely isolated.AcTIve bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistorswith the bus-hold circuitry is not recommended.When V is between 0 and 1.5 V, the devices are in the high-impedance state during power up or power down.CCHowever, to ensure the high-impedance state above 1.5 V, OE should be TIed to V through a pullup resistor;CCthe minimum value of the resistor is determined by the current-sinking capability of the driver. and power-up 3-state. The I circuitryThese devices are fully specified for hot-insertion applications using Ioff offdisables the outputs, preventing damaging current backflow through the devices when they are powered down.The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down,which prevents driver conflict.
