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Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Third semester B.Tech degree examinations (S) September 2020

Course Code: EC207
Course Name: LOGIC CIRCUIT DESIGN (EC, AE)
Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any two full questions, each carries 15 marks. Marks
1 2) 1 Convert the hexadecimal number 2FC3 into binary and decimal. (5)
11. Write down the Octal equivalent of hexadecimal number 3A2E.

111, Subtract binary number 10110 from 10001001

b) Write down the 175 and 2’s complement of the following numbers. (6)
i. -4
11. +253
iii. — 181
c) Determine the Hamming code for the information 1011, with even parity. (4)
2 a) Using the Boolean theorems simplify the following expressions. (8)

(i) Y = AC(ABD) + ABCD + ABC
(1) Y=ABC+B+BD+ABD+AC

b) Using K map simplify the SOP function, and realize it using only NAND gates. (7)
f(a,b,c) = Xm (0,2,3,4,5,6)
3 2) Realize a 2 bit comparator. (7)
b) Implement the following function using an 8 X 1 MUX. (8)
F(A,B,C,D) = &m (1,3,4,11,12,13,14,15)
PART ‏تا‎
‎Answer any two full questions, each carries 15 marks.
4 a) List any four performance ratings of TTL family. (4)
b) Draw the circuit of aCMOS inverter and explain its working (4)
c) Explain the working of a master slave JK flipflop, with the help of circuit diagram. (7)
5 9) Explain the working of a 3 bit UP/DOWN counter. (7)
b) Implement the following two Boolean functions with a PLA: (8)

F1(A,B,C) = =m (0,1,2,4)
F2(A,B,C) = =m (0.5.6.7)

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