VLSI Design MCQ Questions and Answers Quiz

51. Unused inputs on TTL, AND, and NAND gates

  1. degrade the gates noise immunity.
  2. if left open will have the same effect as HIGH inputs.
  3. should be tied HIGH.
  4. All of the above are correct.

52. What advantage does the 74HXX series device have over standard TTL?

  1. reduced propagation delay
  2. higher propagation delay
  3. low power consumption
  4. lower voltage requirements

53. What advantage does the 74LSXX series device have over standard TTL?

  1. higher propagation delay
  2. reduced propagation delay
  3. low power consumption
  4. low power consumption and reduced propagation delay

54. What advantage does the 74LXX series device have over standard TTL?

  1. lower voltage requirements
  2. reduced propagation delay
  3. higher propagation delay
  4. low power consumption

55. What advantage does the 74SXX series device have over standard TTL?

  1. higher propagation delay
  2. lower voltage requirements
  3. low power consumption
  4. reduced propagation delay

56. When a CMOS gate output connects to a TTL gate, which circuit is needed?

  1. a decoupling capacitor
  2. a pull-up resistor
  3. a pull-down resistor
  4. a CMOS buffer

57. When a TTL gate output connects to a CMOS gate, what must be added to the circuit?

  1. a decoupling capacitor
  2. a pull-up resistor
  3. a pull-down resistor
  4. an open-collector gate

58. When interfacing CMOS to TTL what potential problem must be overcome?

  1. There may be insufficient current.
  2. The low output voltage may be insufficient.
  3. The output current may be too great.
  4. The high voltage may be too low.

59. When the outputs of several open-collector TTL gates are connected together, the gate outputs

  1. produce more fan-out.
  2. usually burn out.
  3. are ANDed together.
  4. produce more voltage.

60. When the outputs of several standard TTL gates are connected together, the gate outputs

  1. enable new logic configurations.
  2. produce more fan-out.
  3. usually burn out.
  4. produce more voltage.
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