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digital electronics · combinational logic

2-to-1 Multiplexer

A 2-to-1 multiplexer routes one of two inputs to a single output. The select signal determines whether Y follows I0 or I1. This small circuit is a useful starting point for understanding bus selection, signal routing and Boolean logic implementation. The drawing labels each signal separately so the many-to-one relationship is apparent without showing a gate-level implementation. Larger multiplexers use the same idea with more inputs and additional select bits. Include an enable pin when the selected output must also be controlled by a separate signal.

Type Circuit schematicStandard IEEE Std 315 / ANSI Y32.2Engine schematex-circuitUpdated 9/24/2026
2-to-1 Multiplexer
Drawing preview
The request

“Draw a 5 V 2-to-1 multiplexer with I0 and I1 data inputs, a select input S, and output Y with a 10 kΩ load to ground.”

Then tryChange I0 to a 5 V input.Add an enable input.
What is in this drawing

Read the decisions behind it.

01Two data inputs

I0 and I1 are the sources to select.

02Select line

S determines which input reaches Y.

03Single output

Y carries the selected logic value.

Use this for a basic data-routing or logic-selection circuit.

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FAQ

Common questions

What does a 2-to-1 multiplexer do?

It selects either I0 or I1 and routes the selected input to Y.

How many select lines does it need?

One select line is enough to choose between two inputs.

Is a multiplexer a logic gate?

It is a combinational logic device that can also be used to implement Boolean functions.