Digital Electronics:: Logic Families and Their Characteristcs
Digital Electronics:: Logic Families and Their Characteristcs
31. The problem of interfacing IC logic families that have different supply voltages (VCC's) can be solved by using a:
- level-shifter
- tristate shifter
- decoupling capacitor
- pull-down resistor
32. What is the advantage of using low-power Schottky (LS) over standard TTL logic?
- more power dissipation
- less power dissipation
- cost is less
- cost is more
33. When is a level-shifter circuit needed in interfacing logic?
- A level shifter is always needed.
- A level shifter is never needed.
- when the supply voltages are the same
- when the supply voltages are different
34. A TTL totem-pole circuit is designed so that the output transistors:
- are always on together
- provide linear phase splitting
- provide voltage regulation
- are never on together
36. Which family of devices has the characteristic of preventing saturation during operation?
- TTL
- MOS
- ECL
- IIL
38. What is the difference between the 74HC00 series and the 74HCT00 series of CMOS logic?
- The HCT series is faster.
- The HCT series is slower.
- The HCT series is input and output voltage compatible with TTL.
- The HCT series is not input and output voltage compatible with TTL.
39. 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?
- These are worst-case conditions.
- These are normal conditions.
- These are best-case conditions.
- It doesn't matter what values are used.