Linear Integrated Circuits

6

555 Timer and Its Applications

Objectives

To understand the following aspects of 555 IC timer:

• Functions of inner blocks of 555 timer to get an overall view of IC as timing machine.
• Operating principles of 555 timer as an astable multivibrator.
• Working details of 555 timer as a monostable multivibrator.
• Operation of 555 timer as a bistable multivibrator.
• Application of 555 timer monostable multivibrator to produce pulse-width modulation signals.
• Application of 555 timer astable multivibrator to generate pulse-position modulation waveforms.
• Ramp signal generator circuit using 555 timer monostable multivibrator.
• Function generator IC 8038 to generate sine wave, square wave, and triangular waves.

6.1 INTRODUCTION

The 555 timer is a linear ...