• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 19 subscribers
  • Views 584 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

SN74LVC1G123: Maximum value for timing resistor?

Matt Mozur
Prodigy 30 points
Part Number: SN74LVC1G123

The application curves for the 74LVC1G123 only go up to a value of 200K for the timing resistor.  The specifications for the part only set a minimum value - are there any issues to be aware of in using values above 200K?  I'm trying to change an existing design to extend the pulse width and would like to go up to 499K for the timing resistor (C is 0.1 uF).  I would change the capacitor if I could, but we are maxed out on capacitance value for the PCBA footprint (0402)

Matt

  • 0
    TI__Guru* 97046 points

    Hey Matt,

    Just remember that there's always some leakage current into any CMOS device.  The larger the resistor, the more that leakage will affect the maximum voltage on the capacitor -- at some point, the capacitor won't be charged enough to trigger the one-shot.