7402

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The 7402 (variants 74LS02, 74HC02) is a 74-series logic IC with four independent 2-Input NOR gates.

7402 Pinout

        .--\/--.
  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
        `------'

Signal descriptions

Y is low if either A or B is high, and is high if A and B are both low.