Saturday, 24 December 2011

Multiplexer

Design a full subtractor using Multiplexer IC.
Sol: This is similar to full adder using Multiplexer. The truth table of full subtractor is
 
C B A D B
0 0 0 0 0
0 0 1 1 1
0 1 0 1 1
0 1 1 0 1
1 0 0 1 0
1 0 1 0 0
1 1 0 0 0
1 1 1 1 1    

One IC displays the difference and other displays the borrow.
 The select lines of the ICs are short circuited. This is shown in fig.
The inputs of the first IC are given as follows
D0=D3=D5=D6=0V
And rest of the inputs(D1,D2,D4,D7) are connected to +5V. Vcc, Ground and enable pins are connected suitably.
In the case of second IC, D0=D4=D5=D6=0V and rest of the inputs (D1,D2,D3,D7) are connected to +5V.Vcc, Ground and enable pins are connected suitably. The output of the first IC is the difference and output of the other IC is the borrow.

1 comment:

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