As discussed in chapter 5, combinational circuit output signals depend solely on the momentary state of their input signals or input variables. Time-delay and signal memorisation are not taken into consideration in combinational circuits. This fact makes combinational circuits relatively simple to design and the Karnaugh-Veitch map is once again used to minimise equations. A further helpful design tool for combinational circuits is the truth table, which is discussed in the following design problems.
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