Digital Techniques and Microprocessor Notes

  End  of  Digital Techniques  Notes  and  Questions. 

 Descriptive Questions 1)Construct full adder circuit using K map. 2) Justify ‘NOR gate is called as universal gate’. Sketch relevant diagram. 3) Convert following Boolean equation to standard SOP form and implement using NAND-NAND logic. (i) y = A B C + ABC D + A C D (ii) y = PQ + PQR + PQ R 4)State the rules for BCD addition. 5)Draw two input OR gate, using ECL logic family (only diagram). 6)Realize full subtractor using K-map. 7)Describe positive and negative edge triggering methods of clock with their logic symbol. 8)Calculate the analog output of 4-bit DAC if the digital input is 1101. Assume VFS = 5V. 9)Draw the logic diagram of 4-bit SIPO shift register and explain its working principle. 10) Realize the following expression using K-map. Y = f(A, B, C, D) = Σ m(0, 2, 3, 5, 6, 7, 10, 11) + d (8, 14, 15) and implement it. 11)Simplify the following expression using Boolean laws. Y = (A + B) (A + C) Y = ABC + ABC + ABC 12)Draw the circuit of master slave JK FF using NAND gate and...

Answer the following questions in Brief (4 Marks) 1) List out any four assembler directives and state their functions. 2) Sketch diagram showing interfacing of two chips of RAM having size 2k  8 to 8051 microcontroller. Write its memory map. 3) Minimize following Boolean equation using ‘k’ map : Y = A B C + A B C + A B C + ABC and                implement using basic gates. 4) List out three types of buses. State their functions. 5) Add (532)10 and (248)10 in BCD. 6) Compare TTL and CMOS logic families on the basis of size, power, cost and speed. 7) Minimize following expression using K-map f (P, Q, R, S) = Σ m(0, 1, 4, 5, 7, 8, 9, 12, 13,15). 8) Describe the working of 4-bit ripple counter with logic diagram and waveform. 9) State advantages and disadvantages of single slope ADC. 10) Realize  F1 = Sm (0, 2, 4, 6)                     F2 = Sm (1, 3, 5) using Demultiplexer. 11) Draw and explain...

Question Bank 1) Define following terms related to logic families : (i) Noise Margin (ii) FAN-OUT (iii) Propagation delay (iv) Power dissipation 2) State Demorgan’s theorem’s and prove both theorems using truth table. 3) State functions of preset, clear, clock and SR inputs related to SR flip flop. 4) Sketch diagram of 4 bit asynchronous counter using suitable flip flop. Sketch timing diagram. 5) Perform binary subtraction using 2’s complement method (11001)2 – (1010)2. 6) State DeMorgan’s theorems and prove by Truth-table method for two variables. 7) Give the expression of Grey code equivalent of 4-bit binary using K-map. 8) Draw the circuit diagram of 3-bit asynchronous up/down counter using T-FF. 9) Describe any four specifications of DAC. 10) Perform the following: (11011)2 × (11011)2 11) State the rules for BCD Addition explain with example. 12) Design Half adder using K-map and implement using gates. 13) Subtract (1101)2 from (1110)2 using 1’s & 2’s complement method. 14) Des...

 a) Convert the following hexadecimal number to decimal number (i) (EF)16 (ii) (DAD)16 b) Convert the following decimal number to octal. (i) (28)10 (ii) (62)10 c) Draw the symbol of EX-OR and EX-NOR gate along with  its logical equation d) Draw symbol of AND gate and write its truth table. e) Draw the symbol of D-FlipFlop and T-FlipFlop. f) Define Bidirectional Shift Register and Universal Shift Register. g) State different triggering methods in digital circuits. h) State DeMorgan’s theorems. i) Convert the following: (i) (111011)2 = ( ? ) gray code (ii) (46)10 = ( ? ) excess-3 code j) What is Modulus of counter? How many FlipFlops are required for MOD-11 counter. k) Implement given logical equation using gates Y = AB+C

 (a) Sketch symbol and write truth table of two input EX-OR gate.   (b) Define the term ‘Multiplexer’. State two examples of multiplexer.   (c) Implement T flip flop using J K flip flop. Write its truth table.   (d) Implement following Boolean equation using fundamental gates :   Y = ABC + A BC + A C B   (e) Convert the following decimal number to octal. (i) (28)10 (ii) (62)10 (f)Draw the symbol of EX-OR and EX-NOR gate along with its logical equation g) Draw symbol of AND gate and write its truth table. h) Draw the symbol of D-FlipFlop and T-FlipFlop. i) Define Bidirectional Shift Register and Universal Shift Register. j) State different triggering methods in digital circuits. k) State DeMorgan’s theorems. l) Convert the following: (i) (111011)2 = ( ? ) gray code (ii) (46)10 = ( ? ) excess-3 code m) What is Modulus of counter? How many FlipFlops are required for MOD-11 counter. n) Implement given logical equation using gates Y = AB...

 Q.1) Attempt the following questions:- 10 Marks  (a) Draw the symbol and write the truth table of universal Gates. (b) In a 3 variable K’ Map if there are two quads, interpret the simplified output. (c) Define modulus of counter and write down the number of flips flops required to construct mod 7 counter (d) Construct OR gate using NOR gate. (e) Demonstrate with example the function of EQU directive.  (f) Find the number of address lines required for:  1. 2K RAM  2. 16K ROM