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Digital Electronics And Logic Design Question Paper - Dec 18 - Computer Engineering (Semester 3) - Pune University (PU)
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Digital Electronics And Logic Design - Dec 18

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. How will you implement full-adder using half-adder ? Explain the circuit diagram.
(6 marks) 00

1.b. How lockout condition in counter is avoided.
(2 marks) 00

1.c. Draw and explain Ring counter using JK flip-flop (Timing Diagram is expected).
(4 marks) 00

Or

2.a. Design full Subtractor using multiplexer IC 74151.
(4 marks) 00

2.b.Compare synchronous and asynchronous counter.
(2 marks) 00

2.c. Simplify the following function using Qunie-McCluskey minimization technique : Y(A, B, C, D) = ?£m (0, 1, 2, 3, 5, 7, 8, 9, 11, 14).
(6 marks) 00

3.a. Design an ASM chart for 2-bit UP counter using mode control line. [6] When M = I UP counting When M = 0 remain in same state.
(6 marks) 00

3.b. Implement the following function using PAL : F1(A, B, C, D) = £m (1, 3, 4, 6, 9, 12, 14) F2(A, B, C, D) = ?£m (1, 2, 3, 7, 12, 15).
(4 marks) 00

3.c. Define PLD.Mention different type of PLD.
(2 marks) 00

4.a. Write VHDL code full adder using behavioural style of modeling.
(4 marks) 00

4.b. [4] (b) Explain entity declaration for 4 : 1 multiplexer having enable line.
(2 marks) 00

4.c. Design BCD to Excess-3 code converter using PLA.
(6 marks) 00

5.a. Draw three input standard TTL NAND gate and explain its operation.
(5 marks) 00

5.b. Explain the interfacing of TTL and CMOS : (i) CMOS driving TTL (ii) TTL driving CMOS.
(8 marks) 00

Or

6.a. Draw and explain wired AND gate in detail.
(5 marks) 00

6.b. Explain the characteristics of digital IC.
(4 marks) 00

6.c. Explain with a neat diagram CMOS NOR gate.
(4 marks) 00

7.a. Explain addressing modes of 8051 with example (any three) :
(6 marks) 00

7.b. List any eight applications of microcontroller 8051.
(4 marks) 00

7.c. Explain the following pins of 8051:

(i) RDX

(ii) $\overline{\mathrm{PSEN}}$

(III) $\overline{\mathrm{EA}}$

(3 marks) 00

Or

8.a. State the registers used in Timer/counter operation. Explain TMOD register.
(5 marks) 00

8.b. Explain the following instructions with respective to microcontroller 8051 and give example of each : (i) MUL (ii) L JUMP (iii) SWAP (iv) PUSH.
(8 marks) 00

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