Silicon, Circuits, and the Digital Revolution

Full Adder Circuit

Work out the truth table for the following combination of gates. (2 pts.)

What does the circuit accomplish? (What does it do? -- in words!) (1 pt.)

(HINT: the two gates enclosed in the shaded box comprise a half-adder.)

Please label drawing above and columns below as needed to work out the truth table.

C' A B         C S
0 0 0            
0 0 1            
0 1 0            
0 1 1            
1 0 0            
1 0 1            
1 1 0            
1 1 1            


SCEN103 Comments, suggestions, or requests to ghw@udel.edu.
"http://www.physics.udel.edu/~watson/scen103/colloq2000/fulladder.html"
Last updated May15, 2000.
© George Watson, Univ. of Delaware, 2000.