A technician tests the circuit of Figure 9-4 by using a set of switches to apply the

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A technician tests the circuit of Figure 9-4 by using a set of switches to apply the input code at A4 through A0. She runs through each possible input code and checks the corresponding decoder output to see if it is activated. She observes that all of the odd-numbered outputs respond correctly, but all of the even-numbered outputs fail to respond when their code is applied. What are the most probable faults?


Figure 9-4

Ao A A Ag A (MSB) AAA 00 123 74ALS138 Z mb E 160 +5 V 00 123 , A A A 74ALS138 Z 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6


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Digital Systems Principles And Application

ISBN: 9780134220130

12th Edition

Authors: Ronald Tocci, Neal Widmer, Gregory Moss

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