DP83826I: Power up sequence

Ryuuichi machida

Part Number: DP83826I

Hi,
I refered following old thread(3 years ago).
(+) DP83825I: Power up sequence - Interface forum - Interface - TI E2E support forums
According to this, user can ramp VDDIO and VDDA3V3 at the same time.
>So VDDA3V3 and 3.3V VDDIO can be simply tied in DP83826. Correct?
>yes

However, latest datasheet still show VDDIO should be ramped before VDDA3V3.
Could you reconfirm I can apply above contents to DP83826I ?

Best Regards,

7 days ago

+1 David (ASIC) Liu 7 days ago

TI__Guru**** 181771 points

Hi,

The DP83825 and DP83826 are two completely different designs so the power up sequence of DP83825 does not apply toward DP83826.

For DP83826 power up sequence, please refer to section 7.6 Timing Requirements of the DP83826 datasheet. Both VDDIO or AVDD supply can ramp together or ramp of any of them can be delayed up to the max value as specified in the DP83826 datasheet.

I would also recommend to use DP83826AI as it offers better EMC performance than DP83826.

Thanks

David