What is a Multiplexer MUX A MUX

What is a Multiplexer (MUX)? • A MUX is a digital switch that has multiple inputs (sources) and a single output (destination). • MUX Types 2 -to-1 (1 select line) 4 -to-1 (2 select lines) 8 -to-1 (3 select lines) 16 -to-1 (4 select lines) Block Diagram Inputs (sources) 2 N 1 MUX • The select lines determine which input is connected to the output. Multiplexer Output (destination) N Select Lines 1

Typical Application of a MUX Multiple Sources Selector Single Destination MP 3 Player Docking Station D 1 D 2 MUX D 0 Laptop Sound Card Y D 3 Surround System Digital Satellite A Selected Source 0 0 MP 3 0 1 Laptop 1 Digital Cable TV B 0 Satellite 1 1 Cable TV 2

4 -to-1 Multiplexer (MUX) D 1 D 2 MUX D 0 Y D 3 B A Y 0 0 D 0 0 1 D 1 1 0 D 2 1 1 D 3 3

What is a Demultiplexer (DEMUX)? • A DEMUX is a digital switch with a single input (source) and a multiple outputs (destinations). • DEMUX Types 1 -to-2 (1 select line) 1 -to-4 (2 select lines) 1 -to-8 (3 select lines) 1 -to-16 (4 select lines) Block Diagram Input DEMUX • The select lines determine which output the input is connected to. Demultiplexer 1 (source) 2 N Outputs (destinations) N Select Lines 4

Typical Application of a DEMUX Selector Single Source Multiple Destinations B/W Laser Printer X DEMUX Fax Machine D 0 D 1 Color Inkjet Printer D 2 D 3 B A Selected Destination 0 0 B/W Laser Printer 0 1 Fax Machine 1 0 Color Inkjet Printer 1 1 Pen Plotter 5

1 -to-4 De-Multiplexer (DEMUX) DEMUX D 0 X B D 1 D 2 D 3 A B A D 0 D 1 D 2 D 3 0 0 X 0 0 1 0 0 0 X 0 1 1 0 0 0 X 6

Example : Construct 8 -to-1 multiplexer using one 2 -to-1 multiplexer and two 4 -to-1 multiplexers S 2 S 1 S 0 X 0 0 0 I 0 0 0 1 I 1 0 I 2 0 1 1 I 3 1 0 0 I 4 1 0 1 I 5 1 1 0 I 6 1 1 1 I 7

MULTIPLEXER APPLICATIONS • DATA ROUTING • PARALLEL-TO-SERIAL CONVERSION • OPERATION SEQUENCING • IMPLEMENT LOGIC FUNCTION OF A TRUTH TABLE

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