Exercise: Counters

Questions for: Counters

The given circuit is a(n) ________.

A:
three-bit synchronous binary counter
B:
eight-bit asynchronous binary flip-flop
C:
two-bit asynchronous binary counter
D:
four-bit asynchronous binary counter
Answer: D
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Asynchronous counters are often called ________ counters.
A:
toggle
B:
ripple
C:
binary
D:
flip-flop
Answer: B
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The counter circuit and associated waveforms shown below are for a(n) ________ counter, and the correct output waveform for QB is shown by waveform ________.

A:
synchronous, a
B:
asynchronous, b
C:
synchronous, c
D:
asynchronous, d
Answer: C
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Shift-register counters use ________, which means that the output of the last FF in the register is connected back to the first FF in some way.
A:
MOD
B:
feedback
C:
strobing
D:
switchbacks
Answer: B
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The duty cycle of the most significant bit from a 4-bit (0–9) BCD counter is ________.
A:
10%
B:
20%
C:
50%
D:
80%
Answer: B
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