Multiplexer - Overview and Functionality

Introduction

• A multiplexer (MUX) is a combinational logic circuit.
• Purpose: To switch one of several input lines to a single common output line.
• Selection controlled by select lines (digital inputs).
• Enables multiple input signals to share one output.

Symbol and Structure

• 4-to-1 Multiplexer Symbol
  • Has two select lines, S0 and S1.
  • Four input lines (X0 to X3).
  • One output line.

Working of a 4-to-1 Multiplexer

• Select Line Combinations and Inputs
  • S0 = 0, S1 = 0: X0 is selected.
  • S0 = 1, S1 = 0: X1 is selected.
  • S0 = 0, S1 = 1: X2 is selected.
  • S0 = 1, S1 = 1: X3 is selected.

Logical Circuit of 4-to-1 Multiplexer

• Components used:
  • Two NOT gates.
  • Four three-input AND gates.
  • One four-input OR gate.

Multiplexer Chips

• 4-to-1 MUX Chip
• 8-to-1 MUX Chip
• 16-to-1 MUX Chip

Conclusion

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