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DS90UB913A-Q1: VDDIO need power up earlier than VDD, i am not quite understand what risk will be caused if we not follow the rules?

Frank Xiao
Genius 12055 points
Part Number: DS90UB913A-Q1


hi team,

our datasheet says the VDDIO need power up earlier than VDD, i am not quite understand what risk will be caused if we not follow the rules?

Thanks.

  • 0
    TI__Genius 10475 points
    Hello,
    Please refer to Figure 28 in the latest 913A datasheet on the web (Rev E) for the power-up sequencing requirements (the updated diagram includes the GPO2 state during power-up). VDDIO and VDD_n can be brought up together, this is ok as long as VDD_n does not ramp up before VDDIO (time t1>=0 in Table 8).
    If the power-up sequence is not followed the device operation and functionality cannot be guaranteed.