TPD4E05U06: Treament of NC pin

Shinichi Inoue

Guru 20281 points

Part Number: TPD4E05U06

Dear Specislists,

My customer is considering TPD4E05U06 for 10/100 Ethernet protection.

They have a question.

I would be grateful if you could advise.

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According to the datasheet of P.4 Table 5-2, Pins 6, 7, 9, and 10 are NC pins and should be connected to left open or GND.
On the other hand, the circuit diagram of "DP83822 EVM", it is connected to RXD and TXD.

https://www.ti.com/lit/pdf/snlu179

Which connection is correct?

I am thinking as stated in the data sheet, pins 6, 7, 9, and 10 are unconnected (NC) or GND , and IO is 1, 2, 4 and 5 pin,

Is there any problem with a circuit that connects to pin 5 and pins 3 and 8 to open or GND?

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I appreciate your great help in advance.

Best regards,

Shinichi

8 months ago

+1 Josh Prushing 8 months ago

TI__Expert 5290 points

Hi Shinichi,

It appears like this EVM is showcasing the "straight-through routing" capabilities of this package. Please see the excerpt from the datasheet below:

The "NC" pins can be left floating, grounded, or can be routed on the same line as the corresponding adjacent pin. This means that the data line D1+ is connected to can also be routed through pin 10, D1- will match pin 9, etc. If you look closely at the names on the schematic, pin 1 and pin 10 share the same name, as well as pin 2 and pin 9, and so on. This means the schematic shown is connected correctly, and there should be no issues here.

Please let me know if you have any questions!

Best Regards,

Josh Prushing

0 Shinichi Inoue 8 months ago in reply to Josh Prushing

Guru 20281 points

HI Josh,

Thank you for your reply.

I'll share your answer with the customer.

When they have an additional question, I consult you again.

I appreciate your great help and cooperation.

Best regards,

Shinichi

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TPD4E05U06: Treament of NC pin