Combinational circuits(Half Subtracter, Full Subtracter)

                               In Combinational circuits(Half adder, Full adder) post we have seen what are combinational circuits. In this post i am going to discuss about  other two combinational circuits. They are

1)Half subs-tractor

2)Full  subs-tractor



1)Half substractor :

                              It is a combinational circuit which  is used to subs-tract  two binary bits.   In this circuit we have two inputs and two outputs. Let us consider the inputs as x and y   and  the outputs are D and B. Where D refers to different and B refers to borrower.



Truth table:



X      Y        D           B

0      0         0           0

0      1         1           1

1      0         1           0

1      1         0           0

Diagram:

Half 

subs-tractor

2)Full subs-tractor:

               A full subs-tractor is a combinational circuit which is used for to subtract more than two binary bits. It is the combination o the half subs-tractors. It consists of more than two inputs and only two outputs.

Let us consider the inputs are x,y,z and the outputs are D,B.

Truth table:

X	Y	Z	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

Diagram:

           

Full 

subs-tractor

Combinational circuits(Half adder, Full adder)