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2-1 multiplexer using only nands and nots

  1. Oct 27, 2004 #1
    I need to make a 2-1 mux using only NANDS and inverters. I thought it would look like a simple nand gate with another inverter attached at the end (basically a AND gate). However, that didnt work. I need it so when the selection input is a zero it selects whatever X0 is and when the selection input is a 1 it will always select 0. I know how implement it using 3 NAND gates and an inverter. But I thought since one input is constantly grounded, there would be a alot simplifed version.

  2. jcsd
  3. Oct 27, 2004 #2


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    Staff Emeritus

    When you try and figure out these problems it is always best to write out the truth table and solve the 3 variable k-map (for this case).

    Hint: If the output of the MUX is X0 when S = 0 and the output of the MUX is 0 when S=1, then you'll need 2 inverters and 1 NAND.
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