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Electronics
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Standard Logic Devices (SLD)
Comments
Question
What quantities must be compatible when interfacing two different logic families?
Options
A. only the currents
B. both the voltages and the currents
C. only the voltages
D. both the power dissipation and the impedance
Correct Answer
both the voltages and the currents
Standard Logic Devices (SLD) problems
Search Results
1. A TTL totem pole circuit is designed so that the output transistors are:
Options
A. always on together
B. providing phase splitting
C. providing voltage regulation
D. never on together
Show Answer
Scratch Pad
Discuss
Correct Answer: never on together
2. When an IC has two rows of parallel connecting pins, the device is referred to as:
Options
A. a QFP
B. a DIP
C. a phase splitter
D. CMOS
Show Answer
Scratch Pad
Discuss
Correct Answer: a DIP
3. The problem of interfacing IC logic families that have different supply voltages (V
CC
s) can be solved by using a:
Options
A. level-shifter
B. tri-state shifter
C. translator
D. level-shifter or translator
Show Answer
Scratch Pad
Discuss
Correct Answer: level-shifter or translator
4. What is the standard TTL noise margin?
Options
A. 5.0 V
B. 0.2 V
C. 0.8 V
D. 0.4 V
Show Answer
Scratch Pad
Discuss
Correct Answer: 0.4 V
5. Which of the following summarizes the important features of emitter-coupled logic (ECL)?
Options
A. negative voltage operation, high speed, and high power consumption
B. good noise immunity, negative logic, high frequency capability, low power dissipation, and short propagation time
C. slow propagation time, high frequency response, low power consumption, and high output voltage swings
D. poor noise immunity, positive supply voltage operation, good low-frequency operation, and low power
Show Answer
Scratch Pad
Discuss
Correct Answer: negative voltage operation, high speed, and high power consumption
6. A digital logic device used as a buffer should have what input/output characteristics?
Options
A. high input impedance and high output impedance
B. low input impedance and high output impedance
C. low input impedance and low output impedance
D. high input impedance and low output impedance
Show Answer
Scratch Pad
Discuss
Correct Answer: high input impedance and low output impedance
7. The range of a valid LOW input is:
Options
A. 0.0 V to 0.4 V
B. 0.4 V to 0.8 V
C. 0.4 V to 1.8 V
D. 0.4 V to 2.4 V
Show Answer
Scratch Pad
Discuss
Correct Answer: 0.4 V to 0.8 V
8. The time needed for an output to change as the result of an input change is known as:
Options
A. noise immunity
B. fanout
C. propagation delay
D. rise time
Show Answer
Scratch Pad
Discuss
Correct Answer: propagation delay
9. The use of triggered sweep when using an oscilloscope provides more accuracy in which area?
Options
A. frequency
B. amplitude
C. graticule activity
D. timing
Show Answer
Scratch Pad
Discuss
Correct Answer: timing
10. What is the next step after discovering a faulty gate within an IC?
Options
A. repair the gate
B. resolder the tracks
C. replace the IC involved
D. recheck the power source
Show Answer
Scratch Pad
Discuss
Correct Answer: replace the IC involved
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