E3_1 - ABSTRACT Sequential logic circuits play a very important role in our electronic circuitry A most common sequential logic circuit is the

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ABSTRACT Sequential logic circuits play a very important role in our electronic circuitry. A most common sequential logic circuit is the flip-flop. It’s applications ranges from the simple combinational counters to the complicated digitized network drivers. This report documents the experiment that was conducted to study the application of J-K flip-flops in sequential logic circuits, with the combination of certain logic gates to produce a sequential display of digits in the seven-segment display device. It was found that the output of the J-K flip-flop could forms a two-stage binary counter called the binary ripple counter. By having 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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INTRODUCTION Sequential logic circuits are very useful and important in the field of electronics. Almost all the circuits which require automatic running and routinely works such as digital watch are based on the sequential logic circuits. An important tool for such circuitries is the flip-flops. And the logic gates are usually accompanied in the circuitries to produce more complex outputs. In this experiment, the use of the J-K flip-flop in such circuitry was studied. Its application as a sequential logic circuit was demostrated by a simple combinational circuit which drives a seven-segment display device together with the logic gates to produce a sequential running of digits. 2. EXPERIMENT OBJECTIVES The objectives of the experiment were: i) to understand the application of J-K flip-flops as a binary ripple counter; ii) to analyze the simple combinational circuit which consists a sequential logic circuit in driving a seven- segment display device with useful logic gates. 3. THEORY 3.1 Logic Gates Logic gates are circuits used to process digital signals. These gates function in a two-valued logic system, denoted by symbols 1 and 0. In TTL (Transistor-Transistor Logic) device, a logic level 0 at the input would correspond to a range of 0- 0.8V and a logic level of 1 would correspond to a range of 2.0-5.0V. There are five basic logic functions : AND, OR, NOT, NAND and NOR gates. A table showing the standard graphic logic symbols of these five gates and a summary of their truth table can be found in Appendix B. 3.2 Flip Flops A flip-flop is a sequential logic circuit with two states. These circuits have memory characteristic in that a particular state will remain stable until a signal changes it into the second stable state. The latter state will remain unchange even upon the removal of the signal. Flip-flops can be either edge triggered or level triggered. Data
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This note was uploaded on 10/18/2009 for the course ECONS 111 taught by Professor Yo during the Spring '09 term at Nassau CC.

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E3_1 - ABSTRACT Sequential logic circuits play a very important role in our electronic circuitry A most common sequential logic circuit is the

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