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Digital Electronics
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Logic Families and Their Characteristics
Comments
Question
The problem of different current requirements when CMOS logic circuits are driving TTL logic circuits can usually be overcome by the addition of:
Options
A. a CMOS inverting bilateral switch between the stages
B. a TTL tristate inverting buffer between the stages
C. a CMOS noninverting bilateral switch between the stages
D. a CMOS buffer or inverting buffer
Correct Answer
a CMOS buffer or inverting buffer
Logic Families and Their Characteristics problems
Search Results
1. The word "interfacing" as applied to digital electronics usually means:
Options
A. a conditioning circuit connected between a standard TTL NAND gate and a standard TTL OR gate
B. a circuit connected between the driver and load to condition a signal so that it is compatible with the load
C. any gate that is a TTL operational amplifier designed to condition signals between NMOS transistors
D. any TTL circuit that is an input buffer stage
Show Answer
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Correct Answer: a circuit connected between the driver and load to condition a signal so that it is compatible with the load
2. What is the difference between the 74HC00 series and the 74HCT00 series of CMOS logic?
Options
A. The HCT series is faster.
B. The HCT series is slower.
C. The HCT series is input and output voltage compatible with TTL.
D. The HCT series is not input and output voltage compatible with TTL.
Show Answer
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Correct Answer: The HCT series is input and output voltage compatible with TTL.
3. What should be done with unused inputs to a TTL NAND gate?
Options
A. let them float
B. tie them LOW
C. tie them HIGH
Show Answer
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Correct Answer: tie them HIGH
4. How many 74LSTTL logic gates can be driven from a 74TTL gate?
Options
A. 10
B. 20
C. 200
D. 400
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Correct Answer: 20
5. What is the standard TTL noise margin?
Options
A. 5.0 V
B. 0.0 V
C. 0.8 V
D. 0.4 V
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Correct Answer: 0.4 V
6. What is the major advantage of ECL logic?
Options
A. very high speed
B. wide range of operating voltage
C. very low cost
D. very high power
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Correct Answer: very high speed
7. What is the static charge that can be stored by your body as you walk across a carpet?
Options
A. 300 volts
B. 3,000 volts
C. 30,000 volts
D. Over 30,000 volts
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Correct Answer: Over 30,000 volts
8. Which of the following logic families has the highest maximum clock frequency?
Options
A. S-TTL
B. AS-TTL
C. HS-TTL
D. HCMOS
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Correct Answer: AS-TTL
9. What causes low-power Schottky TTL to use less power than the 74XX series TTL?
Options
A. The Schottky-clamped transistor
B. Nothing. The 74XX series uses less power.
C. A larger value resistor
D. Using NAND gates
Show Answer
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Correct Answer: A larger value resistor
10. Which of the following statements apply to CMOS devices?
Options
A. The devices should not be inserted into circuits with the power on.
B. All tools, test equipment, and metal workbenches should be tied to earth ground.
C. The devices should be stored and shipped in antistatic tubes or conductive foam.
D. All of the above.
Show Answer
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Correct Answer: All of the above.
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