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Improve rise time on monostable multivibrators?

Discussion in 'Electronic Design' started by Jason, Jul 16, 2004.

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  1. Jason

    Jason Guest

    I'm building a circuit that uses a few monostables (LS123's) to
    generate pulses. The resulting pulses end up with about 100 ns rise
    time, and I need to get this down to 15 ns. Any ideas on how I can do
    that?
     
  2. Tim Wescott

    Tim Wescott Guest

    * Use a faster technology, such as a 74VHC123.
    * Minimize the load capacitance on the pin.
    * If you can sacrifice fall time and power consumption, use a pullup.
     
  3. I read in sci.electronics.design that Jason <>
    Stop using the LS family.
     
  4. John Larkin

    John Larkin Guest

    I'm surprised that any LS part would be that slow. I thought they were
    in the 7 ns Tr/Tf range. The simpler gates had typ prop delays of 8
    ns.

    People don't make one-shots much any more; they've fallen out of
    favor.

    John
     
  5. Joerg

    Joerg Guest

    Hi Jason

    One method would be to simply hang a fast Schmitt trigger onto the
    output. If you use an LVDS chip you could achieve ramp times under
    1nsec. But I believe the LS' jitter will cause this ramp to meander
    around quite a bit.

    Regards, Joerg
     
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