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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 flipflop.
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 JK flipflops in sequential logic
circuits, with the combination of certain logic gates to
produce a sequential display of digits in the sevensegment
display device.
It was found that the output of the JK flipflop could forms
a twostage binary counter called the binary ripple counter.
By having additional JK flipflops and logic gates, the
resulted sequential logic circuit could drive a sevensegment
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 flipflops. And the logic gates
are usually accompanied in the circuitries to produce more
complex
outputs.
In this experiment, the use of the JK flipflop in such
circuitry was studied. Its application as a sequential logic
circuit was demostrated by a simple combinational circuit
which drives a sevensegment 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 JK flipflops 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 twovalued logic system, denoted by
symbols 1 and 0.
In TTL (TransistorTransistor 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
2.05.0V.
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 flipflop 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.
Flipflops 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.
 Spring '09
 Yo

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