DP83TG720S-Q1: VDD power supply range

Chuqiang Wen

Part Number: DP83TG720S-Q1

Hi Expert,

My customer has some questions regarding to our VDD power supply range. I checked it from datasheet, our recommended range is 2.97V to 3.63V for 3.3V core supply voltage. The background is that most of the power supply have some noise around the DC supply. For example, if 3.3V power supply have some 3.8V spike which will last several nanoseconds or tens of nanoseconds, does it will influence the function of DP83TG720s-Q1?

Another word, if there is a voltage spike or drop(the amplitude may 3.63V~4V or 2.6V~3.97V) occur at the 3.3V power supply, how long can this noise guarantee that it will not affect the normal function of DP83TG720-Q1 during working?

Thanks and Happy New Year!

Ethan Wen

over 3 years ago

0 Gerome Cacho over 3 years ago

TI__Mastermind 39855 points

Hello,

Thank you for your query. Due to holiday season, please expect delayed responses until next week.

Sincerely,

Gerome

0 Gerome Cacho over 3 years ago in reply to Gerome Cacho

TI__Mastermind 39855 points

Hi Ethan,

We do advise to not violate the RoC table specs as we cannot guarantee performance if even for a small instance of time, the supply voltage exceeds the spec due to noise.

Sincerely,

Gerome

0 Chuqiang Wen over 3 years ago in reply to Gerome Cacho

TI__Expert 5865 points

Hi Gerome,

Thanks for your reply! Happy New Year!

We also do not expect the noise occur. We will add some bypass capacitor to supply pin. But just has some concern if some noise inject into VDD pin, and how long can this noise guarantee that it will not affect the normal function of DP83TG720-Q1 during working. The reason why I ask is that customer find this kind of spec from other competitor and they also would like to know our spec. So we do not have this spec, correct?

Best Regards,

Ethan Wen

0 Gerome Cacho over 3 years ago in reply to Chuqiang Wen

TI__Mastermind 39855 points

Hello,

We do not have this specification.

Sincerely,

Gerome

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DP83TG720S-Q1: VDD power supply range