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[NE556] Vcc Ripple Specification

Chang-woo YANG
Expert 1285 points

Other Parts Discussed in Thread: NE556

Hello~

Would you please let me know the NE556's Vcc ripple spcecification for nominal operation...?

Thanks... C.W. :)

  • 0
    Mastermind 7395 points

    It depends on your requirements. You can check the sensitivity of timing intervals against variations of supply voltage on page 5 of the datasheet

  • 0
    TI__Guru**** 174786 points

    Chang-woo,

    In addition to what Albert said, The VCC ripple can be filtered at the CONT pin to limit its effect on the timing thresholds.
    The cutoff frequency of the RC low pass filter is about Fc=1/(21,000*C)

    If the timing interval is much greater than the ripple period (1/F[ripple]) then filtering the supply for the charging resistor should not be required. If the timing interval  is less than the ripple period then the charging current will be modulated by the ripple.

    Regards,
    Ron Michallick