Figure 7-79(a) shows a 74ALS161 wired as a MOD-12 counter, but it produces the count sequence given

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Figure 7-79(a) shows a 74ALS161 wired as a MOD-12 counter, but it produces the count sequence given in Figure 7-79(b). Determine the cause of the incorrect circuit behavior.

Figure 7-79

CLK 1 0 2 10 7 65 5 4 43 74ALS161 CLK ENT ENP DCBA CLR LOAD RCO QD QC QB QA 74ALS00 (a) 1 2 15 11 12 13 14 QC

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Digital Systems Principles And Application

ISBN: 9780134220130

12th Edition

Authors: Ronald Tocci, Neal Widmer, Gregory Moss

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Question Posted: Nov 15, 2023 09:17 AM

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Figure 7-79(a) shows a 74ALS161 wired as a MOD-12 counter, but it produces the count sequence given

Question:

CLK 1 0 2 10 7 65 5 4 43 74ALS161 CLK ENT ENP DCBA CLR LOAD RCO QD QC QB QA 74ALS00 (a) 1 2 15 11 12 13 14 QC QB QA CLK QD QC QB 0000 QA ‹wrrr QD QC QB QA 0011 (b) 0001 (c) 0010

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Outputs QB and QA seem to be operating correctly but QC and QD stay LOW Our first choice for the fau...View the full answer

Digital Systems Principles And Application

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