VLSI Design MCQ Multiple Choice Questions Answers | Quiz for Practice

Q: 1. What advantage does the 74LSXX series device have over standard TTL?

Correct Answer is: low power consumption and reduced propagation delay

Q: 2. What advantage does the 74LXX series device have over standard TTL?

Correct Answer is: low power consumption

Q: 3. What advantage does the 74SXX series device have over standard TTL?

Correct Answer is: reduced propagation delay

Q: 4. When a CMOS gate output connects to a TTL gate, which circuit is needed?

Correct Answer is: a CMOS buffer

Q: 5. When a TTL gate output connects to a CMOS gate, what must be added to the circuit?

Correct Answer is: a pull-up resistor

Q: 6. When interfacing CMOS to TTL what potential problem must be overcome?

Correct Answer is: There may be insufficient current.

Q: 7. When the outputs of several open-collector TTL gates are connected together, the gate outputs

Correct Answer is: are ANDed together.

Q: 8. When the outputs of several standard TTL gates are connected together, the gate outputs

Correct Answer is: usually burn out.

Q: 9. Which alteration is made in the manufacture of a TTL gate to create an open-collector output?

Correct Answer is: The top output transistor is missing.

Q: 10. Which of the following are not characteristics of TTL logic gates?

Correct Answer is: CMOS transistors

Practice VLSI Design Multiple Choice Questions (MCQs) to enhance your understanding and prepare for exams, interviews, and more. These questions are essential for anyone looking to master Very Large Scale Integration (VLSI) concepts.

About VLSI Design MCQ Questions

VLSI Design MCQs cover a wide range of topics, including digital design, semiconductor physics, and integrated circuit fabrication. These questions help you grasp the fundamental principles and advanced techniques used in designing complex electronic systems.

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Practicing VLSI Design MCQs is crucial for several reasons. It helps you prepare for academic exams, competitive tests, and job interviews. Regular practice reinforces your knowledge, improves problem-solving skills, and builds confidence. These questions are designed to test your understanding and ensure you can apply VLSI concepts effectively.

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VLSI Design MCQ Questions for Practice

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

higher propagation delay
reduced propagation delay
low power consumption
low power consumption and reduced propagation delay

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

lower voltage requirements
reduced propagation delay
higher propagation delay
low power consumption

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

higher propagation delay
lower voltage requirements
low power consumption
reduced propagation delay

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

a decoupling capacitor
a pull-up resistor
a pull-down resistor
a CMOS buffer

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

a decoupling capacitor
a pull-up resistor
a pull-down resistor
an open-collector gate

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

There may be insufficient current.
The low output voltage may be insufficient.
The output current may be too great.
The high voltage may be too low.

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

produce more fan-out.
usually burn out.
are ANDed together.
produce more voltage.

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

enable new logic configurations.
produce more fan-out.
usually burn out.
produce more voltage.

9. Which alteration is made in the manufacture of a TTL gate to create an open-collector output?

The output transistors are replaced by diodes.
The input transistor is replaced by a diode.
The output transistors are missing.
The top output transistor is missing.

10. Which of the following are not characteristics of TTL logic gates?

Totem-pole output
Bipolar transistors
CMOS transistors
Multiemitter transistors

11. Which of the following input levels would not be a valid HIGH for a TTL gate?

2.4 V
2.1 V
1.8 V
All are valid.

12. Which of the following is a concern when using CMOS type devices?

mechanical shock
electrostatic discharge
fan out
under voltage

13. Which of the following is a special type of transistor used in the TTL series to improve speed characteristics?

Belrus
Shockley
Brattain
Schottky

14. When setting the voltage for an external device that must interface with an FPGA, you must change the value of

VCCIO
VDDIN
VDDiO
VCCIN

15. Which of the following digital IC logic families is most susceptible to static discharge?

16. Which of the following is not a common logic family used today?

RTL
ECL
TTL
CMOS

17. Which of the following is not a solution to interface problems between CMOS and TTL?

pull-up resistor
pull-down resistor
level-shifter
buffer

18. Which of the following levels would not be a valid LOW for a TTL gate?

0.1 V
0.7 V
1.0 V
All are valid.

19. Which of the following output levels would be a valid HIGH for a TTL gate?

3.0 V
2.6 V
5.1 V
All are valid.

20. Which of the following output levels would not be a valid LOW for a TTL gate?

0.3 V
0.5 V
0.2 V
All are valid.

21. Which potential problem must be overcome when interfacing TTL to CMOS?

The HIGH output voltage may be too low.
The LOW output voltage may be too high.
The HIGH output voltage may be too high.
The output current may not be sufficient.

22. Which specialized device distinguishes the 74LSXX circuits from standard 74XX circuits?

a Schottky diode
a CMOS transistor
a multiemitter transistor
totem-pole output transistor

23. A common means for comparing the propagation delays and the power dissipation of various logic gates is the

fan-out.
power requirements.
speed-power product.
noise margin.

24. A family of logic devices designed for extremely high speed applications is called

NMOS
ECL
PMOS
TTL

25. An invalid input voltage for a TTL logic gate would be

less than 0.8 V.
greater than 2.0 V but less than 5.0 V.
greater than 2.0 V.
between 0.8 V and 2.0 V.

26. An open-collector TTL gate

must have an external pull-up resistor to produce a LOW.
must have an external pull-up resistor to produce a HIGH.
must have an external ground connected to the output to produce a LOW.
must have a transistor added to the output to produce a HIGH.

27. An open-collector TTL gate

can sink current but cannot source current.
can source current but cannot sink current.
cannot source or sink current.
can sink more current than a standard TTL gate.

28. Each input on a TTL gate is connected to the transistors

base.
collector.
gate.
emitter.

29. Fan-out for a typical TTL gate is

30. In order to interface an FPGA with an external device, you must set the value of the

sink current.
external power supply.
source current.
all of the above