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Digital Electronics And Logic Design Question Paper - Dec 17 - Computer Engineering (Semester 3) - Pune University (PU)
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Digital Electronics And Logic Design - Dec 17
Computer Engineering (Semester 3)
Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.
1.a. Design and implement binary to grey code converter using logic gate.
(6 marks)
00
1.b. Explain look ahead carry generator in detail.
(4 marks)
00
1.c. Draw basic internal structure of decade converter IC 7490 and explain its operation.
(2 marks)
00
Or
2.a. Implement full adder using 8:1 multiplexer and draw the diagram.
(6 marks)
00
2.b. Draw a short note on Johnson counter.
(4 marks)
00
2.c. convert the following flip-flop :
D-Flip-Flop to T-Flip-Flop
(2 marks)
00
3.a. Design the ASM chart for 2-bit binary counter having one enable line E such that when:
E = 1 (count enabled) and
E = 0 (counting is disabled).
(6 marks)
00
3.b. A combinational circuit is defined by following function:
F1(A,B,C) = £m (0,1,3,7)
F2(A,B,C) = £m (1,2,5,6)
Implement this circuit with PLA.
(6 marks)
00
Or
4.a. Write VHDL code for full adder using structural style of modelling (Declared half adder as a component) and also draw truth table for the diagram of full adder.
(6 marks)
00
4.b. Explain entity declaration for XOR gate.
(5 marks)
00
4.c. A combinational circuit is defined by the function :
F1 = £m(0,1,2,3,4)
Implement the circuit with PAL.
(5 marks)
00
Or
5.a. Draw and explain the circuit diagram of CMOS inverter.
(5 marks)
00
5.b. define the following term and explain the standard values for TTL logic Family.
1. Noise Margin
2. Fan Out
3. Power dissipation
4. Propagation Delay.
(8 marks)
00
Or
6.a. Draw and explain 2-input TTL logic gate with totem pole output driver.
(7 marks)
00
6.b. 1. Give the classification of logic family.
(6 marks)
00
- Explain the advantage of open collector output.
7.a. Explain the feature of 8051 microcontroller.
(4 marks)
00
7.b. What are the different addressing mode of 8051? Give example of each.
(6 marks)
00
7.c. Explain the following pins of 8051 :
(5 marks)
00
ALE
XTAL
$\overline{\mathrm{EA}}$
Or
8.a. Describe different timer modes of 8051 Microcontroller. Draw format of TMOD register.
(7 marks)
00
8.b. Explain the following instruction with respective to 8051 and give example of each :
1. PUSH
(6 marks)
00
2.MUL
3.CPL.
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