The 7402 (variants 74LS02, 74HC02) is a 74-series logic IC with four independent 2-input NOR gates.
.--\/--. 1Y <- |01 14| -- +5V 1A -> |02 13| -> 4Y 1B -> |03 12| <- 4A 2Y <- |04 11| <- 4B 2A -> |05 10| -> 3Y 2B -> |06 09| <- 3A Gnd -- |07 08| <- 3B `------'
Y is low if either A or B is high, and is high if A and B are both low.
Categories: 7400 series