In the above section we have learned about the forms of logic gates based on the truth table. A digital circuit is actually composed of one or more of these logic gates. Consider the example in Figure 3.7. below. If we look at the picture, look at the top there are four NAND logic gerban notation, one pin for 5 V and the resources of the pin to ground. While on the bottom is a representation of digital circuits, namely a 7400 chip.
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