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shawn-tang's avatar
shawn-tang
Icon for New Contributor rankNew Contributor
5 years ago

Power up none-monotonous issue on Cyclone10LP

Hello Experts,

I am using the LDO for Cyclone 10LP power supply, but the none-monotonous power rise is found during the power up on my board as below figure shown. This may be caused by high inrush current to power supply.

But it is required in Cyclone10 handbook that the power rise must be monotonous.

My question is:

1. Will the none-monotonous power rise cause Cyclone10LP chip damaged? or impact the chip reliability?

2. if the NCONFIG pin is hold to low till all the power supplies are stable, can this be a workaround for this non-monotonous issue? I found some related note in the handbook as below, but not sure if it can be used for my case.

Thanks & Best Regards,

Shawn

2 Replies

  • Ash_R_Altera's avatar
    Ash_R_Altera
    Icon for Regular Contributor rankRegular Contributor
    5 years ago

    Hi,

    I found a forum posts related to the topic.

    Non-monotonic rise on the power supply - Intel Community

    The datasheet has the following statement "All supplies must be strictly monotonic without plateaus." This is specifically applicable to all VCC voltages.

    Please check the recommendations at the footnote below Table 3 of the datasheet.


    Regards.


  • Ash_R_Altera's avatar
    Ash_R_Altera
    Icon for Regular Contributor rankRegular Contributor
    5 years ago

    Hi,

    Hope the query is answered. Closing the case.


    Thanks.