Digital Electronics:: Logic Families and Their Characteristcs
Digital Electronics:: Logic Families and Their Characteristcs
41. How can ECL have both a NOR and an OR output?
- ECL does not have this feature.
- They are simply the inverse of each other.
42. Which logic family is characterized by a multiemitter transistor on the input?
- ECL
- CMOS
- TTL
- None of the above
43. How is the speed–power product of a logic family determined?
- The propagation delay in s is multiplied by the power dissipation in mW.
- The propagation delay in ms is multiplied by the power dissipation in W.
- The propagation delay in ns is multiplied by the power dissipation in mW.
- The propagation delay in ns is multiplied by the power dissipation in W.
44. 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:
- adding a fixed voltage-divider bias resistive network at the output of the TTL device
- avoiding this condition and only using TTL to drive TTL
- adding an external pull-down resistor to ground
- adding an external pull-up resistor to VCC
45. How does the 4000 series of CMOS logic compare in terms of speed and power dissipation to the standard family of TTL logic?
- more power dissipation and slower speed
- more power dissipation and faster speed
- less power dissipation and faster speed
- less power dissipation and slower speed
46. What should be done with unused inputs to a TTL NAND gate?
- let them float
- tie them LOW
- tie them HIGH
47. The TTL HIGH level source current is higher than the LOW level sinking current.
- TRUE
- FALSE