Here i discus on half adder and full adder circuit with truth table, block and circuit diagram.

As the name suggests half-adder is an arithmetic circuit block by using this circuit block we can be used to add two bits.  As we know it can add two bit number so it has two inputs terminals and as well as two outputs terminals, with one producing the SUM output and the other producing the CARRY.

For half adder circuit the relation between input and output expressed by the Boolean expressions for the SUM and CARRY outputs and it expressed by the equations bellow

SUM S = A^.B+A.B^

CARRY C = A.B

In bellow figure shows the truth table of a half-adder, showing all possible input combinations and the corresponding outputs along with block and circuit diagram.

S = A^B^Cin +A^.B.C^in +A.B^Cin^ +A.B.Cin

Cout = A.B+B.C+A.C

In bellow figure shows the truth table of a half-adder, showing all possible input combinations and the corresponding outputs along with block and circuit diagram.

1 Response

1. Navin says:

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