3-2-5. Combinational Logic: Multiplexers

Logic symbol and truth table of a 2-to-1 multiplexer
Logic symbol and truth table of a 2-to-1 multiplexer

Multiplexers
Examples: 74VHC157, 74VHC153

A multiplexer selects one signal from multiple input signals and forwards it to a single output line.

Timing diagram of a 2-to-1 multiplexer
Timing diagram of a 2-to-1 multiplexer

The following timing diagram shows how one signal is selected from two inputs.
When the SELECT pin is Low (0), a signal is forwarded from the A pin to the Y pin.
When the SELECT pin is High (1), a signal is forwarded from the B pin to the Y pin.

Logic schematic of a 2-to-1 multiplexer (Example: 74VHC157)/Logic schematic of a 4-to-1 multiplexer (Example: 74VHC153)

Examples of multiplexers

Chapter3 Basic CMOS Logic ICs

3-1. Basic CMOS Logic ICs
Details
3-2-1. Combinational Logic: Inverters and Buffers
Details
3-2-2. Combinational Logic: Bidirectional Bus Buffers
Details
3-2-3. Combinational Logic: Schmitt-Trigger Devices
Details
3-2-4. Combinational Logic: Decoders
Details
3-2-6. Combinational Logic: Analog Multiplexer/Demultiplexers
Details
3-2-7. Combinational Logic: Analog Switches
Details
3-3-1. Sequential Logic: Latches
Details
3-3-2. Sequential Logic: Flip-Flops
Details
3-3-3. Sequential Logic: Counters
Details
3-3-4. Sequential Logic: Shift Registers
Details

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