7421

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Dual 4-input AND gates

    +---+--+---+             +---+---+---+---*---+
 1A |1  +--+ 14| VCC         | A | B | C | D | Y |    Y = ABCD
 1B |2       13| 2D          +===+===+===+===*===+
    |3       12| 2C          | 0 | X | X | X | 0 |
 1C |4  7421 11|             | 1 | 0 | X | X | 0 |
 1D |5       10| 2B          | 1 | 1 | 0 | X | 0 |
 1Y |6        9| 2A          | 1 | 1 | 1 | 0 | 0 |
GND |7        8| 2Y          | 1 | 1 | 1 | 1 | 1 |
    +----------+             +---+---+---+---*---+