Half Subtractor

Half Subtractor :
A combinational circuit that performs the subtraction of two bits is called half subtractor. It needs two input bits that are to be subtracted and produces two output bits that are difference and borrow.
The truth table for half subtrator is:

 x y B D
0 0 0 0
0 1 1 1
1 0 0 1
1 1 0 0

Tips:- Here borrow bit is 0 unless x<y.
We can derive simplified boolean function for half subtractor with the above truth table as :
D = x'y+xy' = x⊕y
B = x'y
The logic diagram for this implementation is as below:

 

0Comment

What to read next

Please Go through all these linksW3Schools – HTML Tutorial

DefinitionFiber optics is the technology used to transmit information as pulses of light through strands of fiber made of glass or plastic over long