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.
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Scenario
Selecting one of two logic signals.
Key decisions
- Two data inputs: I0 and I1 are the sources to select.
- Select line: S determines which input reaches Y.
- Single output: Y carries the selected logic value.
When to reuse this
Use this for a basic data-routing or logic-selection circuit.
Frequently asked questions
What does a 2-to-1 multiplexer do?
How many select lines does it need?
Is a multiplexer a logic gate?
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