1. Multiplexor Prepared by: Careene McCallum-Rodney

2. Introduction • A multiplexeror mux is a device that performs multiplexing. • It selects one of many analog or digital input signals and outputs that into a single line. • An electronic multiplexer makes it possible for several signals to share one expensive device or other resource, • for example, one A/D converter or one communication line, instead of having one device per input signal.

3. Introduction • A multiplexor is a selector. The purpose of the multiplexor is to select one of the inputs and output the value stored at its location.

4. Multiplexor’s inputs • It has more than one inputs. • The number inputs should amount to a power of two. • Hence, you can have 2 inputs, 4 inputs, 8 inputs, 16 inputs, 32 inputs, and so on.

5. Multiplexor’s Input • Each input will have a unique identifier. • The number of bits for each input is based on the number of inputs. • For example, 8 inputs is 23, therefore each input will have 3 bits making up its identifier.

6. Multiplexor’s Output • Therefore, a multiplexor will have ONLY ONE OUTPUT.

7. Multiplexor’s Selectors • To the side of the multiplexor is the selector. • The selector will need to know the unique name of the input being selected. • Hence, if each input has 2 bits for their unique identifier, then there will be 2 bits for the selector.

8. Quick Check G B F A

9. Quick Check

10. Activity 1 - Draw a 4 – 1 bit MUX

11. Activity 1 - Draw a 2 – 1 bit MUX

12. Activity 1 - Draw a 16 – 1 bit MUX