The circuit of Figure 5-103 functions as a sequential combination lock. To operate the lock, proceed as

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The circuit of Figure 5-103 functions as a sequential combination lock. To operate the lock, proceed as follows:

1. Momentarily activate the RESET switch.

2. Set the switches SWA, SWB, and SWC to the first part of the combination. Then momentarily toggle the ENTER switch back and forth.

3. Set the switches to the second part of the combination, and toggle ENTER again. This should produce a HIGH at Q2 to open the lock.

If the incorrect combination is entered in either step, the operator must start the sequence over. Analyze the circuit and determine the correct sequence of combinations that will open the lock.


Figure 5-103

SWA SWB SWC +Vcc ww 5 6 ENTER O NO ONC N 7 +Voc +Vcc CLK D CLR CLR CLK Q Q +Vcc RESET OPEN LOCK

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Digital Systems Principles And Application

ISBN: 9780134220130

12th Edition

Authors: Ronald Tocci, Neal Widmer, Gregory Moss

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