Page 84 - Computer science 868 Class 12
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Uses of Multiplexer
              1.  Communication System: Multiplexer allows transmission of different types of data such as audio and video at the
                 same time using a single transmission line.
              2.  Telephone Network: In a telephone network, a Multiplexer help to isolate multiple audio signals sent through a
                 single transmission line, to reach the intended recipients.
              3.  Remote: Remote control used in TV, Cars, and A.C select a specific signal from many available options.
              4.  Transmission from the Computer System of a Satellite: A multiplexer can be used for the transmission of data
                 signals from the computer system of a satellite or spacecraft to the ground system using the GPS (Global Positioning
                 System) satellites.

              Drawbacks of Multiplexer
              1.  Leads to a delay in switching ports and I/O signals.
              2.  Limitations on which ports can be used simultaneously.

              Decoder vs Multiplexer

                                         Decoder                                    Multiplexer
                      1.  Decoder converts binary data to  Octal, Decimal  1.  Multiplexer selects a single output from multiple
                         and Hexadecimal form                         binary inputs
                      2.  Decoder is used to interpret coded data  2.  MUX is used to transmit data



                            Let’s Revisit


                    ♦ AND gate produces 1 as output when all its inputs are 1.
                    ♦ OR gate produces 1 as output when any one of its inputs is 1.
                    ♦ NOT gate inverts the output
                    ♦ NAND and NOR gates are called universal gates as they can be used to implement operations of AND, OR and NOT gates.
                    ♦ XOR gate produces 1 for odd combinations of 1 and 0 in other cases
                    ♦ XNOR gate produces 0 for odd combinations of 1 and 1 for even combinations of 1 or all 0’s
                    ♦ The half adder is a combinational circuit that is designed  to perform the addition of two bits and produces the two binary
                   outputs as sum(S) and carry(C) bits.
                    ♦ The full adder is a combinational circuit that is designed  to perform the addition of three bits and produces the two binary
                   outputs as sum(S) and carry(C) bits.
                    ♦ An Encoder is a combinational circuit that converts decimal, octal or hexadecimal numbers to its equivalent binary form.
                    ♦ Decoder is a  combinational circuit that converts any binary number to its equivalent Octal, Decimal or Hexadecimal form. It
                                              n
                   has ‘n’ input lines and maximum 2  output lines.
                    ♦ Multiplexer is a combinational circuit that selects a single output  from a set of inputs. A multiplexer has  2  input lines and
                                                                                                     n
                   one output line, where n is the number of selection lines.

















                8282  Touchpad Computer Science-XII
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