SPPU Computer Engineering (Semester 3)
Digital Electronics and Logic Design
December 2016
Total marks: --
Total time: --
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

Solve any one question fromQ.1(a,b,c) and Q.2(a,b,c)
1(a) Minimize the following logic function and realize using NAND gates:
F (A, B, C, D) Σm(1, 3, 5, 8, 9, 11, 15) + d(2, 13).
4 M
1(b) Write the rules for BCD addition and give example.
2 M
1(c) Draw and explain 3 bit Asynchrous UP counter using MS-JK flip-flop, also draw timing diagram for the same.
6 M

2(a) Design 16: 1 Multiplexer using 4:1 MUX. Explain the truth table of your design.
6 M
2(b) Compare Moore and Mealy model.
2 M
2(c) Convert the following flip-flop:
i) JK to T
ii) SR to D.
4 M

Solve any one question fromQ.3(a,b) and Q.4(a,b)
3(a) What is an ASM chart? Draw an ASM chart and state table for 2 bit UP-down counter having mode control input M: When M =1: Up counting and When M=0: Down counting.
6 M
3(b) Implement the following Boolean function using PAL: F1 = Σm (0, 2, 3, 4, 5, 6, 7, 8, 10, 11, 15)
F2=Σ(1, 2, 8, 12, 13)
6 M

4(a) Write VHDL code for full adder using: i) Data Flow modeling
ii) Structural modeling.
4 M
4(b) Explain entity declaration for IC7432(OR gate).
2 M
4(c) Implement 3 bit binary to gray code coverter using PLA.
6 M

Solve any one question fromQ5(a,b) and Q.6(a,b)
5(a) Compare TTL and CMOS logic family and also draw CMOS - NOR gate.
7 M
5(b) Draw three input standard TTL NAND gate circuit and explain its operation.
6 M

6(a) State the following charteristics of digital TTL and CMOS Ics:
i) Figure of merit
ii) Noise immunity
iii) Speed of operation.
6 M
6(b) What is logic family? Give the classfication of logic family in detail.
7 M

Solve any one question fromQ7(a,b) and Q.8(a,b)
7(a) Draw explain architecture of microcontroller 8051.
7 M
7(b) Explain any three addressing modes of 8051 with example.
6 M

8(a) Discuss the function of PSW register in 8051 and also explain different flags available in PSW of 8051.
7 M
8(b) Explain the following instructions with respective to 8051 and also give example of each:
i) MOV A, Rn
ii) SWAP A
iii) SET B.
6 M

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