Consider the circuit of Figure 9-24. A test of the circuit yields the results shown in Table

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Consider the circuit of Figure 9-24. A test of the circuit yields the results shown in Table 9-10. What are the possible causes of the malfunction?


Figure 9-24
COUNTER SELECT TC QDQC QB QA SIE CE Tens BCD CLK counter Counter 1 EN TENS TC 4 74ALS157 lo MUX (tens) Zo Zo


Table 9-10

Case 1 Case 2 Case 3 Counter 1 Counter 2 Counter 1 Counter 2 Counter 1 Counter 2 Actual Count 33 47 82 64 63

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Digital Systems Principles And Application

ISBN: 9780134220130

12th Edition

Authors: Ronald Tocci, Neal Widmer, Gregory Moss

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