This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DS90UB940-Q1: Power-Up Sequence

Guru 29720 points
Part Number: DS90UB940-Q1

Hi Team,

The datasheet shows "The power supplies may be ramped simultaneously".
----------------------------------------------------------------------------
(datasheet page 23)
The power supplies may be ramped simultaneously. If sequenced, VDD33 should be first, either by itself or with VDDIO (1.8V or 3.3V) or VDD12, with the other rail(s) following in any order.
----------------------------------------------------------------------------
So my customer tried to ramp the power supplies simultaneously however actual waveforms in his system shows the following because of load condition of each supplies. 



Is the waveform acceptable for DS90UB940-Q1?

Best Regards,
Yaita /Japan disty