A technician breadboards a logic circuit for testing. As she tests the circuits operation, she finds that

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A technician breadboards a logic circuit for testing. As she tests the circuit’s operation, she finds that many of the FFs and counters are triggering erratically. Like any good technician, she checks the VCC line with a DC meter and reads 4.97 V, which is acceptable for TTL. She then checks all circuit wiring and replaces each IC one by one, but the problem persists. Finally she decides to observe VCC on the scope and sees the waveform shown in Figure 8-57. What is the probable cause of the noise on VCC? What did the technician forget to include when she breadboarded the circuit?


Figure 8-57

Vcc 1 4.97 V  1.3 V

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Digital Systems Principles And Application

ISBN: 9780134220130

12th Edition

Authors: Ronald Tocci, Neal Widmer, Gregory Moss

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