Combinational Logic Circuits

In a combinational logic circuit, the output depends only on the current state or 'combination' of inputs. The behaviour of this type of system may be defined using a truth table, or a Boolean expression. Combinational logic systems range in complexity from single logic gates (AND, OR, NOT, etc.), to larger systems constructed using these basic building blocks.

The behaviour of combinational logic systems contrasts with sequential logic, in which the output depends not only only the current inputs, but also on the internal state of the system.

Logic Gates


Representing Logic-based Systems


Boolean Algebra


Simplification of Combinational Logic Circuits


Applications of Combinational Logic


Logic Families


Logic Family Characteristics


Special Purpose Output Circuits


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