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555 timer

Discussion in 'Electronic Design' started by minski_wit, Mar 24, 2006.

  1. minski_wit

    minski_wit Guest

    hello, this may seem like a dumb question but what do you do to reset a
    555 timer on pin 4? 5V, a pulse, etc ?


    Thanks
     
  2. John Fields

    John Fields Guest

     
  3. Rich Grise

    Rich Grise Guest

    Is it also not true that it must be pulled high (or allowed to go high) at
    the end of the reset interval, before the timing cycle will start?

    http://www.national.com/ds/LM/LMC555.pdf - this is the CMOS version;
    does anyone use bipolar 555s any more?

    Thanks,
    Rich
     
  4. Fero

    Fero Guest

  5. John Fields

    John Fields Guest

    ---
    For the device the OP asked about, the 555, releasing the low on the
    RESET- input will be sufficient to enable the chip. Whether the
    chip will start a timing cycle at that time depends on some other
    factors.
    ---
     
  6. John Fields

    John Fields Guest

    ---
    From:

    http://groups.google.com/support/bin/answer.py?answer=12348&topic=250

    "Summarize what you're following up.

    When you click "Reply" under "show options" to follow up an existing
    article, Google Groups includes the full article in quotes, with the
    cursor at the top of the article. Tempting though it is to just
    start typing your message, please STOP and do two things first. Look
    at the quoted text and remove parts that are irrelevant. Then, go to
    the BOTTOM of the article and start typing there. Doing this makes
    it much easier for your readers to get through your post. They'll
    have a reminder of the relevant text before your comment, but won't
    have to re-read the entire article. And if your reply appears on a
    site before the original article does, they'll get the gist of what
    you're talking about."


    So what are you talking about?
     
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