Electronics - Sequential Logic Circuits

Exercise :: Sequential Logic Circuits - General Questions

6. 

Which type of device may be used to interface a parallel data format with external equipment's serial format?

A. key matrix
B. UART
C. memory chip
D. serial-in, parallel-out

Answer: Option B

Explanation:

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7. 

When the output of a tri-state shift register is disabled, the output level is placed in a:

A. float state
B. LOW state
C. high impedance state
D. float state and a high impedance state

Answer: Option D

Explanation:

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8. 

A comparison between ring and johnson counters indicates that:

A. a ring counter has fewer flip-flops but requires more decoding circuitry
B. a ring counter has an inverted feedback path
C. a johnson counter has more flip-flops but less decoding circuitry
D. a johnson counter has an inverted feedback path

Answer: Option D

Explanation:

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9. 

A sequence of equally spaced timing pulses may be easily generated by which type of counter circuit?

A. shift register sequencer
B. clock
C. johnson
D. binary

Answer: Option A

Explanation:

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10. 

What is meant by parallel-loading the register?

A. Shifting the data in all flip-flops simultaneously
B. Loading data in two of the flip-flops
C. Loading data in all four flip-flops at the same time
D. Momentarily disabling the synchronous SET and RESET inputs

Answer: Option C

Explanation:

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