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TPS3840: Undefined pulse at Power up

Tamio Yokokura
Expert 3750 points
Part Number: TPS3840

Tool/software:

Hi, TPS3840 support team

The undefined pulse occurs at VDD power up as shown in following figure. And the voltage on /RESET pin looks like to clamp to VOL. 

Is it really clamped to VOL ? If there are a possibility for the undefined pulse to over VLO, what voltage can you assume it will be clamped up to?

Thanks

Tamio

  • 0
    TI__Genius 16520 points

    Hi Tamio,

    Sorry the timing diagram is not drawn to scale. The VOL line indicate the highest point that the LOW signal can go and not indicate the maximum Vpor spike of the RESET.

    As for the maximum value of the spike, for standard schematic as shown below, it is going to equal the VPOR value as maximum.

    Jesse 

  • 0 in reply to Jesse Villanueva
    TI__Expert 3750 points

    Hi. Jesse,

    Thank you for your prompt reply.

    I understood that the peak voltage of the undefined pulse is up to 950mV, which is the maximum POR.

    And the voltage on /RESET pin will be tracking with VDD until POR is detected as below

    Thanks

    Tamio