SN75LVPE4410: VDD 3.3V(filtered) clarification

Art Mecina

Part Number: SN75LVPE4410

Hello Guys,

Good day.

Our customer wants some clarification on SN75LVPE4410 Typical Connection Schematic. On figure10 of the device datasheet, It shows 3.3V and 3.3V filtered. Is this a typo, are they similar signals?

Thanks and regards,

Art

over 3 years ago

0 Nasser Mohammadi over 3 years ago

TI__Guru* 93670 points

Hi Art,

These are the same signals. Please refer to the EVM schematic - link shown below - and the same 3_3V_REG is used for both 3.3V and 3.3V filtered.

https://www.ti.com/lit/ug/snlu252a/snlu252a.pdf?ts=1629127905076&ref_url=https%253A%252F%252Fwww.ti.com%252Ftool%252FDS160PR410EVM-RSC

Regards ,, Nasser

0 Art Mecina over 3 years ago in reply to Nasser Mohammadi

TI__Genius 16585 points

Thanks Nasser. I just like to confirm because the attached user guide is for DS160PR410EVM.

Best regards,

Art

0 Nasser Mohammadi over 3 years ago in reply to Art Mecina

TI__Guru* 93670 points

These are the same part but different temperature rating. So this user guide applies to the SN75LVPE4410 as well.

Regards ,, Nasser

0 Art Mecina over 3 years ago in reply to Nasser Mohammadi

TI__Genius 16585 points

Thanks Nasser.

Does this mean the information on the datasheet is incorrect? Customer needs further clarification because when he gets reviewed, he has to explain why the information on the datasheet is different than his design.

I might direct customer to this thread in case of follow-up inquiries.

Thanks and regards,

Art

0 F. Dennis Streetman over 3 years ago

Prodigy 60 points

Hi,

My question still has not been answered" Does this mean the information on the datasheet is incorrect? Customer needs further clarification because when he gets reviewed, he has to explain why the information on the datasheet is different than his design."

I was sent a link to an eval board schematic. Is this the suggestion on how to wire this device in a true application? If so, please send me an email stating the 'filtered' mentioned in the datasheet is incorrect.

0 Nasser Mohammadi over 3 years ago in reply to F. Dennis Streetman

TI__Guru* 93670 points

Hi Dennis,

Please note in data sheet figure 10, we have 3.3 V (filtered) when there are 0.1uF supply coupling Caps. This is done to show or emphasize there are supply coupling Caps on VDD pins. I believe you agree on any design we typically use these Caps and here we are trying to emphasize this. Hope this helps.

Regards ,, Nasser

0 F. Dennis Streetman over 3 years ago

Prodigy 60 points

Hi,

Yes, I agree you need decoupling caps but the diagram is misleading being when showing 3.3V(filtered) would also implies a filtered 3.3V source, not caps.

0 Nasser Mohammadi over 3 years ago in reply to F. Dennis Streetman

TI__Guru* 93670 points

Hi Dennis,

Putting filtered on VDD usually means there is additional filtering - other than decoupling Caps. As opposed to using plain VDD on SDA, SCL, and RSVD2 pins. In figure 10 3.3 V (filtered) seems to be just a net label - there is no sign of a pi filter on VDD power trace path. But again, i agree typically filtered means there is some additional power filtering other than just DC coupling Caps.

Regards ,, Nasser

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SN75LVPE4410: VDD 3.3V(filtered) clarification