Explain the working of a demultiplexer with the help of an example.

Ans:

1:4 Demultiplexer: Fig.(a) demonstrates the logic circuit of a 1:4 demultiplexer. This has two NOT gates, one data input line, 4 AND gates, 2 select lines (S₀,S₁) and four output lines (D₀, D₁,D₂,D₃). The data input line feeds each AND gates. Though, the two select lines enable simply one gate at one time. If S₁S₀= 00 then the data goes to D₀. if S₁S₀= 01, so the data goes to D₁. If S₁S₀ = 10, so the data goes to D₂ and if S₁S₀= 1, so the data goes to D₃.

Fig.(a) Logic Circuit of 1:4 Demultiplexer