Logic Families and Their Characteristcs Questions and Answers

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Showing 10 of 47 questions
Q31
The problem of interfacing IC logic families that have different supply voltages (VCC's) can be solved by using a:
  • A level-shifter
  • B tristate shifter
  • C decoupling capacitor
  • D pull-down resistor
Answer: Option A
Q32
What is the advantage of using low-power Schottky (LS) over standard TTL logic?
  • A more power dissipation
  • B less power dissipation
  • C cost is less
  • D cost is more
Answer: Option B
Q33
When is a level-shifter circuit needed in interfacing logic?
  • A A level shifter is always needed.
  • B A level shifter is never needed.
  • C when the supply voltages are the same
  • D when the supply voltages are different
Answer: Option D
Q34
A TTL totem-pole circuit is designed so that the output transistors:
  • A are always on together
  • B provide linear phase splitting
  • C provide voltage regulation
  • D are never on together
Answer: Option D
Q35
The most common TTL series ICs are:
  • A E-MOSFET
  • B 7400
  • C quad
  • D AC00
Answer: Option B
Q36
Which family of devices has the characteristic of preventing saturation during operation?
  • A TTL
  • B MOS
  • C ECL
  • D IIL
Answer: Option C
Q37
How many 74LSTTL logic gates can be driven from a 74TTL gate?
  • A 10
  • B 20
  • C 200
  • D 400
Answer: Option B
Q38
What is the difference between the 74HC00 series and the 74HCT00 series of CMOS logic?
  • 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.
Answer: Option C
Q39
Why are the maximum value of VOL and the minimum value of VOH used to determine the noise margin rather than the typical values for these parameters?
  • A These are worst-case conditions.
  • B These are normal conditions.
  • C These are best-case conditions.
  • D It doesn't matter what values are used.
Answer: Option A
Q40
What is the standard TTL noise margin?
  • A 5.0 V
  • B 0.0 V
  • C 0.8 V
  • D 0.4 V
Answer: Option D

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