2-input NOR gate using 2:1 mux

2-input NOR gate using 2x1 mux: Figure 1 below shows the truth table of a 2-input NOR gate. If we observe carefully, OUT equal B' when A is '0'. Similarly, OUT equals '0' when A is '1'. So, we can make a 2-input mux act like a 2-input NOR gate, if we connect SEL of mux to A, D0 to B' and D1 to '0'.

Figure 1: Truth table of 2-input NOR gate

Figure 2 shows the implementation of 2-input NOR gate using 2:1 mux.

Figure 2: Implementation of 2-input NOR gate using 2x1 mux

Similarly, we can connect B to select pin of mux and follow the same procedure of observation from truth table to get the NOR gate implemented.

Also read:

• NOT gate using 2:1 mux
• 2-input XOR 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