555 timer n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
555 Timer PowerPoint Presentation
Download Presentation
555 Timer

Loading in 2 Seconds...

play fullscreen
1 / 5

555 Timer - PowerPoint PPT Presentation


  • 191 Views
  • Uploaded on

555 Timer. Monostable Operation. Monostable Operation – (one-shot). External capacitor is initially held discharged by transistor inside timer.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about '555 Timer' - imani-patel


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
555 timer

555 Timer

BAE 5413

monostable operation one shot
Monostable Operation – (one-shot)
  • External capacitor is initially held discharged by transistor inside timer.
  • Upon application of a negative trigger pulse of less than 1/3 VCC to pin 2, the flip-flop is set which both releases the short circuit across the capacitor and drives the output high.
  • Voltage across the capacitor then increases exponentially for a period of t = 1.1 RAC, at the end of which time the voltage equals 2/3 VCC.
  • comparator then resets the flip-flop which in turn discharges the capacitor and drives the output to its low state

BAE 5413

astable operation clock1
Astable Operation (Clock)
  • Same as with monostable mode except a connection is made from the threshold to reset which causes the timer to reset after each cycle.
  • Capacitor (0.01 uF) must be connected to control voltage to ground
  • Trigger must be high and dropped to less than 1/3 Vcc for short period to trigger. See datasheet note.

BAE 5413