DS280DF810: How to design board supporting both 8-channel retimers and redrivers?

Vitaly And

Prodigy 180 points

Part Number: DS280DF810

Hello,

i'm trying to design an universal board.

Looking from the board's point of view there are three families of 25G 8-channel devices: BR, MB and DF.

These families differs only within the following pins: D4, D12, E2, E4, E14, F4.

In my case the MUXSEL pins on MB family are not needed since it will be controlled through I2C.

All other pins are GND and/or TEST pins.

Datasheet says that TEST pins should be tied to ground in normal (non-test) operation.

Can i connect all these pins directly to GND without pulldown resistors?

Thank you.

over 5 years ago

0 Nasser Mohammadi over 5 years ago

TI__Guru* 93570 points

Greetings,

From a robust design point of view, it is recommended to use Resistor to GND. Resistors are used to absorb or current any spike that may arise within the system on powerup.

Regards,, Nasser

0 Vitaly And over 5 years ago in reply to Nasser Mohammadi

Prodigy 180 points

It is recommended only to improve stability (because of spikes) or the TEST pins can drive some voltages at powerup an in test mode?

0 Nasser Mohammadi over 5 years ago in reply to Vitaly And

TI__Guru* 93570 points

Hi Vitaly,

Yes your understanding is correct. It is used to improve stability.

Regards,, Nasser

0 Vitaly And over 5 years ago in reply to Nasser Mohammadi

Prodigy 180 points

OK, i'll try to connect directly to GND. It we encounter any troubles then we'll redesign the board.

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DS280DF810: How to design board supporting both 8-channel retimers and redrivers?