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ELEC 2010 Laboratory Manual...

Experiment 6 PRELAB...

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EXPERIMENT 6 Timing and Counting Circuits...

Introduction...

The experiments in this laboratory exercise will help you learn about digital timing and counting circuits. You will learn how to build two common circuits with a 555 timer chip, and how to use a 74169 binary counter chip. Experiment Objectives Learn how to build astable and monostable timing circuits. Learn how to build a binary counter circuit Continue to develop proficiency with the Bit Bucket breadboarding system and the oscilloscope. Continue to develop professional lab skills and written communication skills....

Bring to Lab Your completed Pre-Lab. Turn this in when you get to lab. Several sheets of Engineering Paper....

Theory Timing Circuits (Clocks)...

All computer systems require timing signals to keep their internal operations synchronized. Also, we often use electronic circuits to operate devices or record information in circumstances where time is a crucial factor. Therefore, we need to be able to generate logic signals that occur at precise time intervals. In this experiment, we will learn to generate two types of timing signals- a repeating sequence of pulses, and a onetime, fixed duration pulse....

Repeating Sequence of Pulses (Astable) This type of timing signal is called free-running, or astable. A diagram of this signal is shown in Figure 1....

Figure 1. Astable (Free-Running) Clock Signal...

T THIGH VOH...

TLOW A circuit that generates this signal is often called a clock circuit, and the signal is often called a clock signal, or just a clock. The signal from a clock will normally start by itself whenever the power to the circuit is turned on. Some...

Revised June 14, 2001...

ELEC 2010 Laboratory Manual...

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clock circuits have an extra enable input that allows the clock to be interrupted or paused. The astable clock signal shown in Figure 1 is characterized by the properties listed in Table 1. Table 1. Astable (Free-Running) clock signal properties shown in Figure 1. Property Period Output low interval Output high interval Duty Cycle Output high voltage Output low voltage Notation T TLOW THIGH TLOW / T VOH VOL Units time time time percentage volts volts...

Building an Astable Clock Signal Generator Using the 555 Timer Chip The 555 Timer is an industry standard 8-pin integrated circuit widely used to generate clock signals. (This is the chip used to generate the on-board clock signal ...

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