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Digital Concepts
See What Others Are Saying!
Question
The rise time is the time it takes a pulse to go from ________.
Options
A. the base line to the maximum HIGH voltage
B. 10% of the pulse amplitude to the maximum HIGH voltage
C. the base line to 90% of the pulse amplitude
D. 10% of the pulse amplitude to 90% of the pulse amplitude
Correct Answer
10% of the pulse amplitude to 90% of the pulse amplitude
More questions
1. With an OR gate, the output is HIGH only when both inputs are HIGH.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: False
2. Which format requires fewer conductors?
Options
A. Parallel
B. Serial
C. Both are the same
D. Cannot tell
Show Answer
Scratch Pad
Discuss
Correct Answer: Serial
3. ________ is the output frequency of the counter shown below.
Options
A. 4 MHz
B. 20 kHz
C. 210.5 kHz
D. 800 Hz
Show Answer
Scratch Pad
Discuss
Correct Answer: 20 kHz
4. A good example of the use of a digital representation of an analog quantity is the audio recording of music.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: False
5. Which of the following RAM timing parameters determine its operating speed?
Options
A.
t
ACC
B.
t
AA
and
t
ACS
C.
t
CO
and
t
OD
D.
t
RC
and
t
WC
Show Answer
Scratch Pad
Discuss
Correct Answer:
t
RC
and
t
WC
6. Typically, how often is DRAM refreshed?
Options
A. 2 to 8 ms
B. 4 to 16 ms
C. 8 to 16 µs
D. 1 to 2 µs
Show Answer
Scratch Pad
Discuss
Correct Answer: 4 to 16 ms
7. The architecture of a PAL differs slightly from that of a PROM.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: True
8. CCD stands for ________.
Options
A. capacitor charging device
B. capacitor-capacitor drain
C. charged-capacitor device
D. charge-coupled device
Show Answer
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Discuss
Correct Answer: charge-coupled device
9. Dynamic memories, such as the 2118 16K × 1 RAM, have to multiplex the address bus.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
10. The total amount of external code memory that can be interfaced to the 8051 is:
Options
A. 32K
B. 64K
C. 128K
D. 256K
Show Answer
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Discuss
Correct Answer: 64K
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