16-04-2013, 04:29 PM
555 Timers
555 Timers.ppt (Size: 192 KB / Downloads: 22)
The 555 timer is an integrated circuit specifically designed to perform signal generation and timing functions.
Features of 555 Timer Basic blocks
It has two basic operating modes: monostable and astable
It is available in three packages. 8 pin metal can , 8 pin dip, 14 pin dip.
It has very high temperature stability
Applications of 555 Timer
astable multivibrator
monostable multivibrator
Missing pulse detector
Linear ramp generator
Frequency divider
Pulse width modulation
FSK generator
Pulse position modulator
Schmitt trigger
Astable multivibrator
When the voltage on the capacitor reaches (2/3)Vcc, a switch is closed at pin 7 and the capacitor is discharged to (1/3)Vcc, at which time the switch is opened and the cycle starts over