https://www.ti.com/lit/an/sdya009c/sdya009c.pdf
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74x00.v : Quad 2-input NAND gate.
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74x02.v : Quad 2-input NOR gate.
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74x04.v : Hex inverter gate.
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74x07.v : Hex buffer gate.
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74x08.v : Quad 2-input AND gate.
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74x10.v : Tripple 3-input NAND gate.
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74x11.v : Tripple 3-input AND gate.
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74x13.v : :TODO: Dual 4-input NAND gate. (Schmidt-trigger)
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74x17.v : Hex buffer gate. (Open collector.)
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74x18.v : :TODO: Dual 4-input NAND gate. (Schmidt-trigger)
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74x20.v : Dual 4-input NAND gate.
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74x21.v : Dual 4-input AND gate.
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74x42.v : BCD to decimal decoder.