The following is a block diagram of a 4-bit adder like that found in a 7483 IC. It takes two 4-bit binary numbers in (plus a carry-in) and gives the addition of the two numbers as a 5-bit binary word ...

For an 4-bit parallel adder, there must be 4 full adder circuits. A ripple carry adder is a logic circuit in which the carry-out of each full adder is the carry-in of the succeeding next most ...