The signals shown in Figure 4-79 are applied to the inputs of the circuit of Figure 4-32.

Question:

The signals shown in Figure 4-79 are applied to the inputs of the circuit of Figure 4-32. Suppose that there is an internal open circuit at Z1-4.

(a) What will a logic probe indicate at Z1-4?

(b) What dc voltage reading would you expect at Z1-4? (Remember that the ICs are TTL.)

(c) Sketch what you think the CLKOUT and SHIFTOUT signals will look like. (d) Instead of the open at Z1-4,

Figure 4-79

CLOCK LOAD SHIFT 1 1


Figure 4-32

CLOCK 1 LOAD 3 SHIFT +5V 14 Z1 7 Z1 2 4 2 10 9 +5V 14 72 72 3 CLKOUT SHIFTOUT 8 IC 71 72 Type 74HC04 hex

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Related Book For  book-img-for-question

Digital Systems Principles And Application

ISBN: 9780134220130

12th Edition

Authors: Ronald Tocci, Neal Widmer, Gregory Moss

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