Answered: A 555 timer is an integrated circuit…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Question

The astable 555 Timer operates as follows:

1) When the timer is initially turned on, the capacitor C is completely discharged and begins charging through the combined resistance of R1 and R2 (series) and the output is equivalent to the source voltage, Vs.

2) When the voltage on the capacitor C reaches 2/3rd of the supply voltage, the internal circuitry of the 555 Timer IC causes the DIS pin to go to 0V, causing the capacitor C to discharge through resistor R2 and the output to go to 0V.

3) Once the voltage on the capacitor C falls to 1/3rd of the supply voltage, the internal circuitry of the 555 Timer IC causes the DIS pin to no longer be 0V, and the capacitor C begins charging through resistors R1 and R2 and setting the output voltage back to the source voltage.NOTE: if the capacitor is initially charged (Vo), the capacitor charging equation becomes: Vc= Vs+(Vo―Vs)e^(-t/(RC))

4)Steps 2 and 3 are repeated until power is removed from the circuit and the capacitor fully discharges.

If Vs = 5V, R1 = 1kΩ, R2 = 2kΩ, and C = 1mF, determine the following:

Find The amount of time that the output of the 555 Timer is high when the circuit is first powered on, The amount of time that the output of the 555 Timer is low during a regular cycle of the output, and the amount of time that the output of the 555 Timer is high during a regular cycle of the output.

A 555 timer is an integrated circuit (IC) that utilizes RC circuitry to produce either an oscillating
output (square wave) or a single pulse. In the astable configuration (see below), the 555 timer
produces a square wave output with the peak at the supply voltage and the bottom at ground.
v, O
RESET
DIS
THR
OUT
Output
TRIG
GND
CTRL
10nF
GND

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