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- Question
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
- Correct Answer
- Over 30,000 volts
- 1. 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 Discuss
- 2. 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 Discuss
- 3. 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 Discuss
- 4. 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. Discuss
- 5. 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 Discuss
- 6. Which of the following logic families has the highest maximum clock frequency?
Options- A. S-TTL
- B. AS-TTL
- C. HS-TTL
- D. HCMOS Discuss
- 7. 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 Discuss
- 8. 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. Discuss
- 9. Whenever a totem-pole TTL output goes from LOW to HIGH, a high-amplitude current spike is drawn from the Vcc supply. How is this effect corrected to a digital circuit?
Options- A. By connecting a radio-frequency capacitor from Vcc to ground.
- B. By using a switching power supply
- C. By connecting a capacitor from Vout to ground
- D. By connecting a large resistor from Vcc to Vout Discuss
- 10. Why is the fan-out of CMOS gates frequency dependent?
Options- A. Each CMOS input gate has a specific propagation time and this limits the number of different gates that can be connected to the output of a CMOS gate.
- B. When the frequency reaches the critical value, the gate will only be capable of delivering 70% of the normal output voltage and consequently the output power will be one-half of normal; this defines the upper operating frequency.
- C. The higher the number of gates attached to the output, the more frequently they will have to be serviced, thus reducing the frequency at which each will be serviced with an input signal.
- D. The input gates of the FETs are predominantly capacitive, and as the signal frequency increases the capacitive loading also increases, thereby limiting the number of loads that may be attached to the output of the driving gate. Discuss
Integrated-Circuit Logic Families problems
Search Results
Correct Answer: very high speed
Correct Answer: a CMOS buffer or inverting buffer
Correct Answer: a circuit connected between the driver and load to condition a signal so that it is compatible with the load
Correct Answer: The HCT series is input and output voltage compatible with TTL.
Correct Answer: tie them HIGH
Correct Answer: AS-TTL
Correct Answer: A larger value resistor
Correct Answer: All of the above.
Correct Answer: By connecting a radio-frequency capacitor from Vcc to ground.
Correct Answer: The input gates of the FETs are predominantly capacitive, and as the signal frequency increases the capacitive loading also increases, thereby limiting the number of loads that may be attached to the output of the driving gate.
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