2-7and B are HIGH. As a result, f is HIGH. The input requirements have been satisfied, so the output isHIGH (logic 1).Figure 2-4. —AND gate input and output signals.TRUTH TABLENow let’s refer to figure 2-5. As you can see, a Truth Table and a Table of Combinations are shown.The latter is a deviation of the Truth Table. It uses the HIGH and LOW logic levels to depict the gate’sinputs and resultant output combinations rather than the 1 and 0 logic states. By comparing the inputs andoutputs of the two tables, you see how one can easily be converted to the other (remember, 1 = HIGH and0 = LOW). The Table of Combinations is shown here only to familiarize you with its existence, it will notbe seen again in this book. As we mentioned earlier, the Truth Table is a chart that shows all possiblecombinations of inputs and the resulting outputs. Compare the AND gate Truth Table (figure 2-5) withthe input signals shown in figure 2-4.Figure 2-5. —AND gate logic symbol, Truth Table, and Table of Combinations.

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