Multiplexer (2-to-1)

Use the combinational 2-to-1 Multiplexer to route I0 or I1 to Y. Select S=0 chooses I0; S=1 chooses I1.

Overview

The 2-to-1 Multiplexer is a combinational selector that routes one of two data inputs to a single driven output.

DigiSim Interface

Direction	Pins	Behavior
Input	I0, I1	One-bit data inputs.
Input	S	Select input.
Output	Y	Selected data value.

Selection Table

The component always drives Y. A released input follows Logic Lab's LOW sampling convention. For a driven unknown, the simulator evaluates possible binary values and retains a defined result only if all possibilities agree.

Simulation Boundary

This is an atomic functional selector. It does not model a pass-transistor network, switch resistance, current, loading, or an internal gate tree.

Learning Path

Prerequisites

AND Gate OR Gate NOT Gate

Next Steps

Multiplexer (4-to-1)Demultiplexer (1-to-2)

Frequently Asked Questions

What is a multiplexer?

A multiplexer (MUX) selects one of several input signals and forwards it to a single output. The selection is controlled by select lines.

How does a 2-to-1 MUX work?

A 2-to-1 MUX has 2 data inputs (I0, I1), 1 select input (S), and 1 output (Y). When S=0, Y=I0; when S=1, Y=I1.