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[FAQ] How do I terminate any unused channels of a logic device?

Guru 55530 points

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All CMOS inputs must be terminated at either Vcc or Ground.

The inputs of a CMOS device are high-impedance.  These terminations can be through a resistor (for example, a 10kohm pull-up resistor to Vcc or a 1kohm pull-down resistor to ground), or they can be directly connected. 

CMOS outputs are typically best left floating.  If this is not an option (for example, in transceivers where inputs and outputs share a pin), the output can be terminated to ground or Vcc through a resistor (10k, 100k, etc).

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