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Is it OK to leave the bus terminal (input/output) pin of a bidirectional bus buffer open when it is floating?

Do not leave any unused inputs of CMOS logic ICs in the floating (High-Z) state, and connects to VCC or to GND. In the floating state, CMOS logic ICs are susceptible to a false output or oscillation due to external noise.
A High on the /G pin places bus terminals of a bidirectional bus buffer such as the 74xxx245 and output terminals of some latches and flip-flops in the floating state. If the /G pin is set High at any given time, connect each bus terminal pin to VCC or GND via a resistor.
Do not apply a signal to bus pins externally when they are in output mode.
CMOS logic ICs with a bushold capability (e.g., 74VCXH) do not require an external pull resistor. 

Unused inputs of CMOS logic ICs tied to V<sub>CC</sub> or GND
Unused inputs of CMOS logic ICs tied to VCC or GND
Unused bidirectional pins of a bidirectional bus buffer  pulled up to V<sub>CC</sub> or down to GND
Unused bidirectional pins of a bidirectional bus buffer pulled up to VCC or down to GND
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