7404

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The 7404 (variants 74LS04, 74HC04) is a 74-series logic IC with six independent inverters (NOT gates).

7404 Pinout

        .--\/--.
  1A -> |01  14| -- +5V
  1Y <- |02  13| <- 6A
  2A -> |03  12| -> 6Y
  2Y <- |04  11| <- 5A
  3A -> |05  10| -> 5Y
  3Y <- |06  09| <- 4A
 Gnd -- |07  08| -> 4Y
        '------'

Signal descriptions

Y is the logical inverse of A (1 if A is 0 and vice versa).