2-input OR gate using 2:1 mux

2-input OR gate using 2x1 mux: Figure 5 below shows the truth table for a 2-input OR gate. If we observe carefully, OUT equals B when A is '0'. Similarly, OUT is '1' (or A), when A is '1'. So, we can make a 2:1 mux act like a 2-input OR gate, if we connect D0 pin to B and D1 pin to A, with select connected to A.

In a 2-input OR gate, output is '1' when either or both of the inputs are '1'. Otherwise, output is '0'.
Figure 5: Truth table of 2-input OR gate

Figure 6 below shows the implementation of 2-input OR gate using a 2:1 multilpexer:


A 2-inputs multiplexer can be converted to an OR gate, if we connect the select pin of mux to A-input, D0 to B-input and D1 to VDD. OR gate using mux, OR gate using 2x1 mux
Figure 6: Implementation of 2-input OR gate using 2:1 mux

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