The 74AHC1G02 and 74AHCT1G02 are 2-input NOR gates from the high-speed Si-gate CMOS family. The devices exhibits low power dissipation and high noise immunity for an improved system performance.

Both inputs of N1 are connected to each other, so when input P is HIGH, output is zero. This logic zero is passed on to N2, at initial state of zero on the input 6, output 4 is logic one. This means ...