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Hi,
Could you please let me know how to treat unused input pin? Can it leave open? or short it to GND?
Regards,
Nagata.
Unused outputs can be left open.
The A and B inputs have internal pull-up/-down resistors and can be left open. The G and /G inputs always must have a valid voltage; connect them to VCC or GND as needed.
Hi Nagata,
I agree with what Clemens stated.
Here is a figure from the datasheet that shows the internal pull-up/down resistors of the A and B inputs:
With G and /G, connect them to VCC or GND as needed, do not leave them floating.
Regards,
Tyler