Combinational Logic

A combinational logic circuit is a combining of the basic logic gates (AND, OR, NOT, etc.) to implement a function. All outputs of the circuit depend only upon the current inputs. This is in contrast with sequential logic where the output is also a function of past inputs.

The half adder is an example of a combinational logic circuit.

References

Kleitz, W. Digital Microprocessor Fundamentals. 3rd Edition. Prentice Hall, 2000.
Mano, M. Morris, and Kime, Charles R. Logic and Computer Design Fundamentals. 2nd Edition. Prentice Hall, 2000.