Open CMOS inputs

CMOS inputs may never be left open circuit. There is a chance that the input ends up at half the supply voltage and the current consumption of the IC will increase enormously. Besides, it can cause noisy interference that can be detected throughout the entire IC or surrounding circuit. Whenever the input is open, perhaps because of a design error, poor soldering or a broken PCB track, it is important that this problem is fixed as soon as possible since it is quite possible that the IC will fail.