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Home ‣ Digital Electronics ‣ Logic Families and Their Characteristics Comments
- Question
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
- Correct Answer
- to reduce the effects of noise, connect between power supply and ground
- 1. 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
- 2. Which family of devices has the characteristic of preventing saturation during operation?
Options- A. TTL
- B. MOS
- C. ECL
- D. IIL Discuss
- 3. The problem of the VOH(min) of a TTL IC being too low to drive a CMOS circuit and meet the CMOS requirement of VIH(min) is usually easily overcome by:
Options- A. adding a fixed voltage-divider bias resistive network at the output of the TTL device
- B. avoiding this condition and only using TTL to drive TTL
- C. adding an external pull-down resistor to ground
- D. adding an external pull-up resistor to VCC Discuss
- 4. PMOS and NMOS ________.
Options- A. represent MOSFET devices utilizing either P-channel or N-channel devices exclusively within a given gate
- B. are enhancement-type CMOS devices used to produce a series of high-speed logic known as 74HC
- C. represent positive and negative MOS-type devices, which can be operated from differential power supplies and are compatible with operational amplifiers
- D. None of the above Discuss
- 5. Which of the following logic families has the shortest propagation delay?
Options- A. CMOS
- B. BiCMOS
- C. ECL
- D. 74SXX Discuss
- 6. 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
- 7. The TTL HIGH level source current is higher than the LOW level sinking current.
Options- A. True
- B. False Discuss
- 8. The most common TTL series ICs are:
Options- A. E-MOSFET
- B. 7400
- C. quad
- D. AC00 Discuss
- 9. 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
- 10. Ten TTL loads per TTL driver is known as:
Options- A. noise immunity
- B. fan-out
- C. power dissipation
- D. propagation delay Discuss
Logic Families and Their Characteristics problems
Search Results
Correct Answer: low noise margin, low output voltage swing, negative voltage operation, fast, and high power consumption
Correct Answer: ECL
Correct Answer: adding an external pull-up resistor to VCC
Correct Answer: represent MOSFET devices utilizing either P-channel or N-channel devices exclusively within a given gate
Correct Answer: ECL
Correct Answer: sink, source current
Correct Answer: False
Correct Answer: 7400
Correct Answer: 10%, 90%, 90%, 10%
Correct Answer: fan-out
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