Logic Families and Their Characteristcs Questions and Answers

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Showing 10 of 47 questions
Q41
How can ECL have both a NOR and an OR output?
  • A ECL does not have this feature.
  • B They are simply the inverse of each other.
Answer: Option B
Q42
Which logic family is characterized by a multiemitter transistor on the input?
  • A ECL
  • B CMOS
  • C TTL
  • D None of the above
Answer: Option C
Q43
How is the speed–power product of a logic family determined?
  • A The propagation delay in s is multiplied by the power dissipation in mW.
  • B The propagation delay in ms is multiplied by the power dissipation in W.
  • C The propagation delay in ns is multiplied by the power dissipation in mW.
  • D The propagation delay in ns is multiplied by the power dissipation in W.
Answer: Option C
Q44
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:
  • 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
Answer: Option D
Q45
How does the 4000 series of CMOS logic compare in terms of speed and power dissipation to the standard family of TTL logic?
  • A more power dissipation and slower speed
  • B more power dissipation and faster speed
  • C less power dissipation and faster speed
  • D less power dissipation and slower speed
Answer: Option D
Q46
What should be done with unused inputs to a TTL NAND gate?
  • A let them float
  • B tie them LOW
  • C tie them HIGH
Answer: Option C
Q47
The TTL HIGH level source current is higher than the LOW level sinking current.
  • A TRUE
  • B FALSE
Answer: Option B

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