NOT gate using 2:1 mux

NOT gate using 2:1 mux: Figure 13 shows the truth table for a NOT gate. The only inverting path in a multiplexer is from select to output. To implement NOT gate with the help of a mux, we just need to enable this inverting path. This will happen if we connect D0 to '1' and D1 to '0'.

Figure 1: Truth table of NOT gate

We can also say that we need to propagate '0' to output when input (select) is 1 and '1' when input is '0'. Figure 14 shows the implementation of NOT gate using 2x1 mux:

Figure 2: NOT gate implementation using 2:1 mux

Also read:

• 2-input XOR gate using 2:1 mux
• 2-input NOR gate using 2:1 mux
• 2-input XNOR gate using 2:1 mux
• 2-input OR gate using 2:1 mux
• 2-input NAND gate using 2:1 mux
• 2-input AND gate using 2:1 mux