DIGITAL ELECTRONICS
4-to-1 Multiplexer
A 4-to-1 multiplexer uses two binary select inputs to choose one of four data inputs. Each select combination maps to one input, then routes that value to Y. The circuit is common in digital systems that need to share a bus, select an operating mode or implement a small truth table. This example keeps the data sources and select states visible so the selection relationship is clear. The same structure scales: an 8-to-1 multiplexer needs three select bits, while a 16-to-1 multiplexer needs four.
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CASE ANALYSIS
Scenario
Selecting one signal from four sources.
Key decisions
- Four inputs: I0 through I3 provide selectable data.
- Two select bits: S0 and S1 encode one of four choices.
- Output Y: The selected input appears at one output.
When to reuse this
Use this for a four-source digital signal selector.
FAQ
Frequently asked questions
Why does a 4-to-1 MUX need two select lines?
Two binary bits represent four possible selections.
What do I0 through I3 mean?
They are the four data inputs available to the multiplexer.
Can it select analog signals?
This logic example selects digital levels; analog multiplexers use different switch circuitry.
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circuit-4-to-1-multiplexer