7400

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The 7400 (variants 74LS00, 74HC00) is a 74-series logic IC with four independent 2-Input NAND gates.

7400 Pinout

        .--\/--.
  1A -> |01  14| -- +5V
  1B -> |02  13| <- 4A
  1Y <- |03  12| <- 4B
  2A -> |04  11| -> 4Y
  2B -> |05  10| <- 3A
  2Y <- |06  09| <- 3B
 Gnd -- |07  08| -> 3Y
        `------'

Signal descriptions

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