how to generate 0.5 micro pulse using 555 timer ic

Discussion in 'General Electronics Chat' started by krish1986, Jun 18, 2009.

  1. krish1986

    Thread Starter New Member

    Jun 12, 2009
    8
    0
    hi how to generate 0.5 micro sec pulse using 555 timer..
    please post the full calculation for R,C
     
  2. Papabravo

    Expert

    Feb 24, 2006
    10,152
    1,793
    Are you sure that a pulse that narrow is even possible? For every choice of a capacitor value there is a range of resistance values that give realizable pulse widths. You may be outside the devices capabilities.
     
  3. Papabravo

    Expert

    Feb 24, 2006
    10,152
    1,793
    Although the math may give you the result you want, the actual chip may not. You need to check the datsheet very carefully.
     
  4. Wendy

    Moderator

    Mar 24, 2008
    20,766
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    If the ½µs pulse is absolutely required, there are a lot of other ways to go about it, up to and including transistor monostables. Speaking for myself, I've always placed the 555 limits at around 1µs, but I've been wrong before.
     
  5. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
    2,040
    287
    It's pushing the envelope of the specs, but might be possible.

    One could also use this to drive a passive differentiator to sharpen up the pulse.
    Eric
     
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