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Digital integrated circuits I<br />

Figure 10.24 A completed truth table for the experiment in Figure 10.21<br />

In Boolean terms, the output of a NOR gate is the exact<br />

inverse of the OR gate’s output. When applied to the three<br />

input NOR gate and its truth table shown in Figure 10.25, we<br />

can see that the NOR gate’s output is 1 when neither A NOR<br />

B NOR C is 1 — in other words, the exact inverse of the OR<br />

gate’s output.<br />

Figure 10.25<br />

(a) a NOR gate; (b) its truth table<br />

As a Boolean statement this is written:<br />

225

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