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Is it OK to leave the bidirectional pin of a bidirectional bus buffer open when it is floating?

For bidirectional bus buffers such as 74xxx245, it is necessary to fix the input level to a known value by means of an external pull-up or pull-down resistor when the bidirectional pin is floating (in the high-impedance state). Unused bidirectional pins must always be connected to either VCC or GND.
ICs with a bus-hold circuit (74VCXH etc.) do not require an external pull resistor.

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