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AM3352: power-up sequence check

Sung-IL
Mastermind 30920 points
Part Number: AM3352

Dear Champs,

Could you please check if below power-up sequence is OK for AM3352?

My customer will have power performance test for their system, but they want to know if there will be any impact on AM3352 device internally.

They confirmed the 3.3V power rail is not exceed over 2V as shown in difference(red line), but 3.3V power rail started ramp-up about 3ms before 1.8V power rail.

They are worrying this issue in power rail order can cause an impact on AM3352 device internally, and want to check with us.

Could you please check if this power rail is OK for AM3352?

Thanks and Best Regards,

SI.

  • +1
    TI__Expert 8275 points

    Hi Sung-IL,

    What we can see here is not a violation of the datasheet. You are correctly concerned about the relevant section of the datasheet, Note 'B' under "Figure 6-2. Preferred Power-Supply Sequencing With Dual-Voltage I/Os Configured as 3.3 V":

    The 3.3-V I/O power supplies may be ramped simultaneously with the 1.8-V I/O power supplies if the voltage sourced by any 3.3-V power supplies does not exceed the voltage sourced by any 1.8-V power supply by more than 2 V. Serious reliability issues may occur if the system power supply design allows any 3.3-V I/O power supplies to exceed
    any 1.8-V I/O power supplies by more than 2 V.

    The 3ms difference is not an issue, so long as the voltage difference between the two does not exceed 2V. This slow slew rate of the 3.3v rail needs to be constant across the product line otherwise we cannot guarantee that the IO cells will not be damaged from over voltage.

    Regards,

    Colin