Multiplexer
A multiplexer is a multi-input and single output combinational circuit with 2^n input lines and a single output line. It is also treated as a mux.
Various types of multiplexers are as follows:
2×1 Multiplexer
In this, there are two inputs. The block diagram of a 2×1 multiplexer is as follows:
Truth Table
| Input | Output |
| 0 | A0 |
| 1 | A1 |
Logical Expression:
Y=S0’.A0+S0.A0
4×1 Multiplexer
In this, there are a total of four inputs. The block diagram of a 4×1 multiplexer will be as follows:
Truth Table:
| Input | Output | |
| S1 | S0 | Y |
| 0 | 0 | A0 |
| 0 | 1 | A1 |
| 1 | 0 | A2 |
| 1 | 1 | A3 |
Logical Expression:
Y=S1’S0’A0 + S1S0A1 + S1S0’A2+S1S0A3
Reference