9. The diagram below shows the relation between a multiplexer and a Demultiplexer . I0 I1 I2 I3 S1 S0 Y out Y0 Y1 Y2 Y4 S1 S0 Input 4 to 1 MUX 1 to 4 DEMUX
11. A Decoder is a Demultiplexer with a change in the name of the inputs : When the IC is used as a Decoder, the input I is called an Enable input Y0 Y1 Y2 Y4 S1 S0 ENABLE INPUT 2 to 4 Decoder
12. Characteristic Table of a 2-to-4 DECODER, with ACTIVE LOW Outputs and with ACTIVE LOW Enable Input: Table 2
![Example of a Combinatorial Circuit: A Multiplexer (MUX) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]](https://image.slidesharecdn.com/multiplexer-demul-100722030415-phpapp02/85/multiplexer-demul-1-320.jpg)
![Example: A 4-to-1 Multiplexer ,[object Object],I 0 I 1 I 2 I 3 S 0 S 1 Y 1 output n control inputs 2 n inputs Enable (G)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)