Figure 3-60 shows an application of logic gates that simulates a two way switch like the ones

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Figure 3-60 shows an application of logic gates that simulates a two way switch like the ones used in our homes to turn a light on or off from two different switches. Here the light is an LED that will be ON (conducting) when the NOR gate output is LOW. Note that this output is labeled

LIGHT

to indicate that it is active-LOW. Determine the input conditions needed to turn on the LED. Then verify that the circuit operates as a two-way switch using switches A and B. (In Chapter 4, you will learn how to design circuits like this one to produce a given relationship between inputs and outputs.)


Figure 3-60

+5 V +5 V B +5V LIGHT

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Digital Systems Principles And Application

ISBN: 9780134220130

12th Edition

Authors: Ronald Tocci, Neal Widmer, Gregory Moss

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