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- Question
Which of the following logic families has the shortest propagation delay?
Options- A. CMOS
- B. BiCMOS
- C. ECL
- D. 74SXX
- Correct Answer
- ECL
- 1. Why is the operating frequency for CMOS devices critical for determining power dissipation?
Options- A. At low frequencies, power dissipation increases.
- B. At high frequencies, the gate will only be able to deliver 70.7 % of rated power.
- C. At high frequencies, charging and discharging the gate capacitance will draw a heavy current from the power supply and thus increase power dissipation.
- D. At high frequencies, the gate will only be able to deliver 70.7 % of rated power and charging and discharging the gate capacitance will draw a heavy current from the power supply and thus increase power dissipation. Discuss
- 2. The problem of interfacing IC logic families that have different supply voltages (VCC's) can be solved by using a:
Options- A. level-shifter
- B. tristate shifter
- C. decoupling capacitor
- D. pull-down resistor Discuss
- 3. Which is a mode of operation of the GAL16V8?
Options- A. Simple mode
- B. Complex mode
- C. Registered mode
- D. All of the above Discuss
- 4. The complex programmable logic device (CPLD) contains several PAL-type simple programmable logic devices (SPLDs) called:
Options- A. macrocells
- B. microcells
- C. AND/OR arrays
- D. fuse-link arrays Discuss
- 5. Each programmable array logic (PAL) gate product is applied to an OR gate and, if combinational logic is desired, the product is ORed and then:
Options- A. the polarity fuse is restored
- B. sent to an inverter for output
- C. sent immediately to an output pin
- D. passed to the AND function for output Discuss
- 6. 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
- 7. 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
- 8. Which family of devices has the characteristic of preventing saturation during operation?
Options- A. TTL
- B. MOS
- C. ECL
- D. IIL Discuss
- 9. 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
- 10. 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
Logic Families and Their Characteristics problems
Search Results
Correct Answer: At high frequencies, charging and discharging the gate capacitance will draw a heavy current from the power supply and thus increase power dissipation.
Correct Answer: level-shifter
Correct Answer: All of the above
Correct Answer: macrocells
Correct Answer: sent to an inverter for output
Correct Answer: represent MOSFET devices utilizing either P-channel or N-channel devices exclusively within a given gate
Correct Answer: adding an external pull-up resistor to VCC
Correct Answer: ECL
Correct Answer: low noise margin, low output voltage swing, negative voltage operation, fast, and high power consumption
Correct Answer: to reduce the effects of noise, connect between power supply and ground
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