7427
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The 7427 (variants 74LS27, 74HC27) is a 74-series logic IC with three independent 3-input NOR gates.
7427 Pinout
.--\/--.
1A -> |01 14| -- +5V
1B -> |02 13| <- 1C
2A -> |03 12| -> 1Y
2B -> |04 11| <- 3C
2C -> |05 10| <- 3B
2Y <- |06 09| <- 3A
Gnd -- |07 08| -> 3Y
`------'
Signal descriptions
Y is high if all of A, B and C are low. Y is low if any of A, B or C is high.
