TUSB7320 / Power up and down sequence

S.Satoshi

Hi Everyone,

Please let me know the detail of power up and down sequence. I'd like to know which supply should be input first. Or is there no requirement between VDD11, VDD33 and VDDA_3P3?

Best Regards,

Sonoki / Japan Disty

over 9 years ago

0 Elias Villegas M. over 9 years ago

TI__Guru* 76130 points

Hello,
Please take a look at the Section 9.1 of the Datasheet, you can find all the information related to power up/down sequence.
Regards

0 S.Satoshi over 9 years ago in reply to Elias Villegas M.

Guru 21685 points

Hi Elias,

I'm not sure that 1.1V or 3.3V should ramp up first because it state that "Apply 1.1-V and 3.3-V voltages" for power-up and "Remove the 3.3-V and 1.1-V voltages" for power-down. Does attached figure of power-up and power-down mean that 1.1V and 3.3V can ramp up and down without any time limitation and sequence?

Best Regards,

Sonoki

0 Elias Villegas M. over 9 years ago in reply to S.Satoshi

TI__Guru* 76130 points

Correct,
There is no timing requirement between VDD11 and VDD33, they have to follow the power-up sequence though, I mean, they have to follow all the timing requirements regarding GRST#, PERST#, REFCLK, etc.
Regards

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TUSB7320 / Power up and down sequence