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Home ‣ Digital Electronics ‣ Logic Families and Their Characteristics Comments
- Question
The most common TTL series ICs are:
Options- A. E-MOSFET
- B. 7400
- C. quad
- D. AC00
- Correct Answer
- 7400
- 1. The TTL HIGH level source current is higher than the LOW level sinking current.
Options- A. True
- B. False Discuss
- 2. An open collector output can ________ current, but it cannot ________.
Options- A. sink, source current
- B. source, sink current
- C. sink, source voltage
- D. source, sink voltage Discuss
- 3. Why is a decoupling capacitor needed for TTL ICs and where should it be connected?
Options- A. to block dc, connect to input pins
- B. to reduce noise, connect to input pins
- C. to reduce the effects of noise, connect between power supply and ground Discuss
- 4. Which of the following summarizes the important features of emitter-coupled logic (ECL)?
Options- A. low noise margin, low output voltage swing, negative voltage operation, fast, and high power consumption
- B. good noise immunity, negative logic, high-frequency capability, low power dissipation, and short propagation time
- C. low 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 Discuss
- 5. Which family of devices has the characteristic of preventing saturation during operation?
Options- A. TTL
- B. MOS
- C. ECL
- D. IIL Discuss
- 6. The rise time (tr) is the time it takes for a pulse to rise from its ________ point up to its ________ point. The fall time (tf) is the length of time it takes to fall from the ________ to the ________ point.
Options- A. 10%, 90%, 90%, 10%
- B. 90%, 10%, 10%, 90%
- C. 20%, 80%, 80%, 20%
- D. 10%, 70.7%, 70.7%, 10% Discuss
- 7. Ten TTL loads per TTL driver is known as:
Options- A. noise immunity
- B. fan-out
- C. power dissipation
- D. propagation delay Discuss
- 8. Why is a pull-up resistor needed for an open collector gate?
Options- A. to provide Vcc for the IC
- B. to provide ground for the IC
- C. to provide the HIGH voltage
- D. to provide the LOW voltage Discuss
- 9. If all inputs to a TTL NAND gate are low, what is the ON, OFF condition of each transistor in the circuit?
Options- A. Q1-ON, Q2-OFF, Q3-ON, Q4-OFF
- B. Q1-ON, Q2-ON, Q3-OFF, Q4-OFF
- C. Q1-OFF, Q2-OFF, Q3-ON, Q4-ON
- D. Q1-OFF, Q2-ON, Q3-OFF, Q4-ON Discuss
- 10. Assume that a particular IC has a supply voltage (Vcc) equal to +5 V and ICCH = 10 mA and ICCL = 23 mA. What is the power dissipation for the chip?
Options- A. 50 mW
- B. 82.5 mW
- C. 115 mW
- D. 165 mW Discuss
Logic Families and Their Characteristics problems
Search Results
Correct Answer: False
Correct Answer: sink, source current
Correct Answer: to reduce the effects of noise, connect between power supply and ground
Correct Answer: low noise margin, low output voltage swing, negative voltage operation, fast, and high power consumption
Correct Answer: ECL
Correct Answer: 10%, 90%, 90%, 10%
Correct Answer: fan-out
Correct Answer: to provide the HIGH voltage
Correct Answer: Q1-ON, Q2-OFF, Q3-ON, Q4-OFF
Correct Answer: 82.5 mW
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