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NE555: NE555 schematic review

daniel
Genius 5095 points
Part Number: NE555
Other Parts Discussed in Thread: LM555

Hi team,

Could you please help to review the schematic of NE555?

Thanks

  • 0
    TI__Guru**** 165326 points
    Daniel,

    LM555 and NE555 are similar devices. The advice I gave for LM555 applies here too.

    The only thing I noticed was the T_RESET formula that doesn't match the LM555 formula for monostable.
    NE555 one shot time is 1.1*R*C
    LN(2) is the time from 1/3 to 2/3 charge. For one shot the capacitor goes from 0V to 2/3 VCC (just over one time constant)