Determine the output signal at Q7 if we connect a 74HC165 with DS = 0 and CP INH = 0 and then apply the input waveforms given in Figure 7-72. P0-P7 represent the parallel data on P0 P1 P2 P3 P4 P5 P6 P7.

Question

Determine the output signal at [latex]Q_{7}[/latex] if we connect a 74HC165 with [latex]D_{S} = 0[/latex] and CP INH = 0 and then apply the input waveforms given in Figure 7-72. [latex]P_{0}-P_{7}[/latex] represent the parallel data on [latex]P_{0}[/latex] [latex]P_{1}[/latex] [latex]P_{2}[/latex] [latex]P_{3}[/latex] [latex]P_{4}[/latex] [latex]P_{5}[/latex] [latex]P_{6}[/latex] [latex]P_{7}[/latex].

Accepted Answer

We have drawn the timing diagram for all eight FFs so that we could track their contents over time even though only [latex]Q_{7}[/latex] will be accessible. The parallel load is asynchronous and will occur as soon as [latex]{SH}/{\overline{LD}}[/latex] goes LOW. After [latex]{SH}/{\overline{LD}}[/latex] returns to a HIGH, the data stored in the register will move one FF to the right (toward [latex]Q_{7}[/latex]) with each PGT on CP.

Question 7.22: Determine the output signal at Q7 if we connect a 74HC165 wi...

Related Answered Questions