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TPS3837 MR Pulse Width Minimum (tW)

Scott Walker
Prodigy 60 points
Other Parts Discussed in Thread: TPS3837

In the NanoOPower Supervisory Circuits (SLVS292E) there is a specifiction I'm trying to understand with is the  Pulse Width Minimum (tW).  Does this mean that the pulse width on the MR pin must be more then 1 usec to generate a reset?  Or is there some other meaning?

  • 0
    TI__Expert 8905 points
    Hi Scott,

    It means that we are certain it will capture a pulse greater than 1us on the MR pin, or 6us on the Vdd pin. Pulses that are shorter than this (such as a 1us brownout on Vdd) are likely not to be detected and therefore will not trip the RESET/.

    Regards,
    David
  • 0 in reply to David Hopkins
    Prodigy 60 points
    Thanks David. My situation is a bit different. I have a 120ns pulse that I would like the TPS3837 to filter out on the MR pin and thru not cause a reset. Is there a minimum pulse width that is guaranteed to NOT cause a reset on the MR pin?
  • 0 in reply to Scott Walker
    TI__Expert 8905 points
    Hi Scott,

    There is no guaranteed pulse width to not cause a reset as the MR pin is designed to react quickly to pulses on it, while the Vdd pin has built-in glitch rejection. 120ns may be fast enough to be ignored as there is an internal pull-up to Vdd and to further help ensure MR's operation you could place a small capacitor at the MR pin (100nF to 1uF will probably do the trick).

    Regards,
    David