A circuit that uses combinational logic has outputs that only depend on the inputs' current states. Each output, in mathematical words, is a function of the inputs.
From the specifications, determine the minimum and maximum input and output quantities. Using their connections to the input, determine the truth table for each of the outputs. For each output, simplify the boolean expression. Use Boolean algebra or Karnaugh maps. A complete adder, which accepts two binary digits as input and outputs a sum bit and a carry bit, is an illustration of a combinational circuit. Many digital devices, such as computers and calculators, employ full adders. A multiplexer is yet another illustration of a combinational circuit.
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