December 2008
1.Convert the equivalent hexadecimal number
i) (28)10
ii)(0101011.11)2
iii)(761)8
1 b) Prove usint Demorgan theorem
A.B + AB + A .B = A B

2.(a) Using the k-map , design the function of using NAND gates only .
b) Differentiate between decoder and demultiplexer .

3.(a)Draw and explain full subractor circuit .
b) What is Johnson's counter ? Explain its specific practical applications

4 . (a) Differentiate between level triggered and edge triggered logic .
(b) How CMOS and TTL interfaced ? Explain how CMOS drives TTL and TTL drives CMOS .
5 (a) Draw & Explain the working of RTL NAND gate .
b) What is D/A converter ?Explain the conversion process with help of R-2R ladder .
6 (A) Write short notes on :
a)PLA
b) CPLD

7 (A) Explain the designing process of Asynchronous counters .
b) Draw and explain the circuit diagram for BCD adder .

8 Briefly describe any two :
a) Parallel Comparator
b) TTL
c)Error detection and correction codes .