22320 22223 3 Hours / 70 Marks seat No[ 2] q aad | Instructions — (1) All Questions are Compulsory. i (2) Answer each next main Question on 4 new page. } (3) Mlustrate your answers with neat sketches wherever necessary. (4) Figures to the right indicate full marks. (3) Assume suitable data, if necessary. (6) Use of Non-programmable Electronic Pocket Calculator is. permissible. (7) Mobile Phone, Pager and any other Electronic q >) Communication devices are not permissible in an Examination Hall. (8) Preferably, write the answers in sequential order. Marks any FIVE of the following: 0 ne base of following number system: 18 of comparator. 'D flipflop and write its truth table.22320 (2) 2, Attempt any THREE of the following: a) Convert the given binary into decimal, octal, hexadecimal and gray code: (10110101 )y b) Draw the block diagram of BCD to 7 segment decoder using IC 7447, Write truth table of it -q7 Define PLA. Draw its block diagram. ‘ef Implement full adder using two half adder. 3. Attempt any THREE of the following: 3) Draw the OR gate and NOR gate using NAND gate only: 6 Compare TTL, ECL and CMOS logic families. (any four points) ©) Draw 4 bit twisted ring counter and explain working with truth table and waveforms. d) A combinational circuit is defined as Fy = Im, 5, 7) and F, = Lm(4, 5, 7). Implement the circuit with a PLA having 3 inputs, 3 product terms and 2 outputs. 4, ‘Attempt any THREE of the following: Define following terms : i) Fan-in ‘the help of truth table. 1 multiplexer using 8 : 1 multiplexer. of master salve JK flipflop with truth22320 1 Marks 5. Attempt any TWO of the followin, n MPesign nod-6 counter using 1C 7490 and explain its design with working. ~ J»¥ Explain classification of memories. What is flash memory? ©) i) State the rules of BCD addition. Qe ii) Perform BCD addition of 6 072)i9 + G48)i9 6. Attempt any TWO of the following: 2 ee Design synchronous decade counter using D’ flipflop. b) i) Minimize the following expression using K-map. “a Y = Im, 2, 5,7, 8 10, 13, 15) ii) Realize the minimized expression using basic gates. @) ©) Reduce following boolean expressions using boolean laws. i) Y-=AB+AB + AB + AB 2 ii) Y = ABC + ABC + ABC @) iii) Y = ABC + ABC + ABC @22320 3 Hours / 70 Marks Seat Nofj aL [als cl Instructions ~ (1) All Questions are Compulsory (2) Answer cach next main Question on a new page (3) Illustrate your answers with neat sketches wherever necessary. (4) Figures to the right indicate full marks. e (5) Assume suitable data, if necessary. (6) Use of Non-programmable Electronic Pocket Calculator is permissible, (2) Mobile Phone, Pager and any other Electronic Communication devices are not permissible in B Examination Hall. Marks 4 ey 10 a f demultiplexer. write the truthtable for T-flipflop. synchronous and asynchronous counter, to given number (11111); = Q)gay 000.0 ‘of ADC IC0809. - K-map.22320 {2] Marks 2. Attempt any THREE of the following : 12 a) Sketch the given Boolean expression; use one AND gate one OR gate only Y = AB + AC. b) Draw circuit diagram of BCD to seven segment decoder and write its truth table. ©) Draw the block diagram of programmable array logic. d) Minimize following expression using K-map. f(A,B,C.D) = Em (1,5,6,7,11.12,13,15) 3. Attempt any THREE of the following : 12 a) Realize the following logic operation using only NOR gates : AND, OR, NOT. Describe the operation of 4 bit serial in serial out shift register. Calculate the analog output of 4 bit DAC if the digital is 1101. Assume Vps = SV ‘the working of SR flipflop with its truth table and ‘THREE of the following : R truth table and logical output equation of OR ‘gate.22320 a) d) °) ») °° (3) Marks Attempt any TWO of the following : 2 Explain 3 bit asynchronous counter with output waveforms. Compare following (Any three points) i) RAM with ROM. memory. ii) EPROM with EEPROM memory. Convert the following GAC) 6 = (yy 1708 ii) (2003),9 = (jg 70D iii) (228)19 = pep 01:0 COLO) 000 Attempt any TWO of the following ; 2 Give the block schematic of decade counter IC 7490, Design mod-7 counter using IC. Design a four bit BCD adder using 1C-7483 and NAND gate only. Draw the circuit and explain the principle of TTL gate totempole output