E3_3 - ABSTRACT Sequential logic circuits have great...

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ABSTRACT Sequential logic circuits have great importance in our electronic circuitry. A most common building block of these circuits is the flip-flops. The applications ranges from simple combinational counters to complicated digitized decision making network drivers. This report documents the experiment conducted to study the application of J-K flip-flops in sequential logic circuits by combining with certain logic gates to produce a sequential display of digits in a seven-segment display device. It was found that the output pulses from a J-K flip-flop could produce a binary ripple counter. By combining with additional J-K flip-flops and logic gates, the resulted sequential logic circuit could drive a seven-segment display device to produce a certain sequential display of digits.
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CONTENTS Page 1. Experimental Objectives . . . . . . . . . . 1 2. Introduction . . . . . . . . . . . . . 1 3. Theory 3.1 Logic Gates . . . . . . . . . . . . 1 3.2 Flip Flops . . . . . . . . . . . . 2 3.3 Seven Segment LED Display Device . . . . . 3 4. Flip Flops 4.1 Equipment . . . . . . . . . . . . . 3 4.2 Procedure . . . . . . . . . . . . . 3 4.3 Results/Observations . . . . . . . . . 4 5. Application of Logic Circuits 5.1 Equipment . . . . . . . . . . . . . 4 5.2 Procedure . . . . . . . . . . . . . 5 5.3 Results/Observations . . . . . . . . . 6 6. Discussions
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6.1 Designing a Sequential Logic Circuit . . . . 7 6.2 Significance of Source and Sink Current Definition of Fan-in and Fan-out . . . . . 10 7. Conclusions . . . . . . . . . . . . . . 10 Appendix A : Experiment Log Sheet . . . . . . . 11 Appendix B : Truth Table of Logic Gates . . . . . 14 Appendix C : References . . . . . . . . . . 15
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1. EXPERIMENT OBJECTIVES The objectives of the experiment were: i) to understand how the J-K flip-flops could produce different binary ripple counters and; ii) to analyze the application of the circuit obtained above in driving a seven-segment display device with useful logic gates. 2. INTRODUCTION Sequential logic circuits have many useful and important application in electronics world. Most of these applications involve circuits which require automatic running and routinely works such as a digital watch. A simple tool for such circuitries is the flip-flops. Logic gates usually accompanied in the circuitries to produce more complex useful outputs. In this experiment, the use of the J-K flip-flop in such circuitry was studied. Its application in a sequential logic circuit was demonstrated by driving a seven-segment display device with some other logic gates to display a sequential running of certain digits. A brief introduction to the works of J-K flip-flops, logic gates and seven-segment display devices can be found in section 3. The results and observations conducted with the flip-flops and the application to the seven-segment display device can be found in section 4 and 5 respectively. Section 9 discusses the answers to the questions raised on page 9 of the laboratory manual. 3.
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E3_3 - ABSTRACT Sequential logic circuits have great...

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