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SN74LVC1G123DCUR Timer

Kiran A
Intellectual 610 points

Hello,

We have used  "SN74LVC1G123DCUR" timer circuit in one of our design. Please find the attached screenshot for the same.

We added a schottky diode( D1) parallel to R14, to make sure our capacitor discharges quickly when board is powered off, because we had high impedance path of 120K ohm for capacitor to discharge.  But now we are facing some issue with pulse width with increasing temperature. The application note doesn't call for adding diode but we implemented for safety precaution.

So please let us know what will be the impact on functionality of timer circuit for below scenarios:

1) If we keep the diode D1

2) If we remove the diode D1

Thanks,

Kiran. A

  • 0
    TI__Guru* 97017 points
    The external diode is unnecessary - the device already has an internal diode for this very purpose.

    Schottky diodes are notorious for high leakage current - it's likely that the added current is causing the capacitor to charge faster than expected with the given RC values which causes a shorter pulse width than expected.