DP83867E: power sequence

Michael T Schneider

Part Number: DP83867E

we are using the DP83867ERGZT. On the power sequence for the DP83867 in three-supply mode, the datasheet says if the 2.5V is only

Powering the DP83867 then the 1.8v my ramp up any time before 2.5v. But, then is says the 1.8V must be stable within 25ms of 2.5V.

So, can we still Power 1.8V before the 2.5V if we have other parts using the 2.5V?

Why do we want 1.8V stable within 25ms of 2.5v?

over 4 years ago

0 Nikhil Menon over 4 years ago

TI__Genius 11725 points

Hello,

If the 2.5V supply provides power to DP83867 devices only, then 1.8V supply may ramp up any time before 2.5V. If other parts are using the 2.5V supply, this is not true. 1.8V should be stable within 25 ms of 2.5V for proper device POR.

Please let me know if any further clarification is needed.

Thank you,

Nikhil

0 Michael T Schneider over 4 years ago in reply to Nikhil Menon

TI__Expert 3790 points

Does that mean we can power 2.5V and 1.8V at the same time?

0 Nikhil Menon over 4 years ago in reply to Michael T Schneider

TI__Genius 11725 points

Hi Michael,

If only DP83867 devices are being powered from these supplies, this should be ok.

Thank you,

Nikhil

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DP83867E: power sequence