Design Of Digital Circuits - Dharmsinh Desai University

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Design Of Digital Circuits Lab Manual 3.3 Implementing the Solution 1. Draw block diagram, truth table and pin diagram of 7490 IC. 2. According to pin assignment, connections are done to above mentioned ICs. 3. Note down the output reading on the multimeter according to the truth tables for the 4-Bit BCD Counter. 4. Wave forms can be observed on CRO for the outputs of Counter. 3.4 Testing the Solution Truth table for BCD counter Count Output Q4 Q3 Q2 Q1 0 1 2 3 4 5 6 7 8 9 4 Conclusions By using 7490 ICs we can perform BCD counter and check the truth table. Department of Information Technology, Faculty of Technology, D. D. University, Nadiad. 51
Design Of Digital Circuits Lab Manual Aim: Design of the 11011 Sequence Detector. EXPERIMENT-12 Tools / Apparatus: Power supply, Digital Trainer kit, ICs, Connecting wires, Multimeter, CRO, Clock Pulse Generator, etc. Procedure: 1. Derive the state diagram and state table for the circuit. 2. Count the number of states in the state diagram (call it N) and calculate the number of flipflops needed (call it P) by solving the equation 2 P-1 < N 2 P . This is best solved by guessing the value of P. 3. Assign a unique P-bit binary number (state vector) to each state. Often, the first state = 0, the next state = 1, etc. 4. Derive the state transition table and the output table. 5. Separate the state transition table into P tables, one for each flip-flop. WARNING: Things can get messy here; neatness counts. 6. Decide on the types of flip-flops to use. When in doubt, use all JK’s. 7. Derive the input table for each flip-flop using the excitation tables for the type. 8. Derive the input equations for each flip-flop based as functions of the input and current state of all flip-flops. 9. Summarize the equations by writing them in one place. 10. Draw the circuit diagram. Most homework assignments will not go this far, Department of Information Technology, Faculty of Technology, D. D. University, Nadiad. 52
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Design Of Digital Circuits - Dharmsinh Desai University

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