DS110DF410: Does TI's retimer guarantee that the input Serdes signal is at the same frequency as the output Serdes signal?

Hi Aiwen,

I suggest reading this section from the datasheet which should answer your questions.

Best,

Lucas

Hi Aiwen,

The output signal frequency is the VCO frequency, which either locks to the mean arrival times of bit transitions of the input signal or is manually set by the user. In both cases the output signal is only present if the VCO frequency is locked to the input signal, so yes the output signal frequency is the same as the input signal frequency.

Best,

Lucas

Hi Aiwen,

Yes, all of our retimers and redrivers have the same output signal frequency as input signal frequency.

Best,

Lucas

Hi Aiwen,

The Typical Applications section of the datasheet shows examples of DS250DF410 supporting both 100GbE and 50GbE front-port applications. The datasheet also specifically mentions support for CAUI-4. I would expect DS250DF410 to also support the other 3 optical modules assuming the signaling requirements are similar to CAUI-4.

Best,

Lucas

Hi Aiwen,

These are the key differences between these 3 parts:

• DS250DF410: 4-channel retimer, supports data rates 20.2752 - 25.8Gbps and sub-rates
• DS250DF810: 8-channel retimer, supports data rates 20.2752 - 25.8Gbps and sub-rates
• DS280DF810: 8-channel retimer, supports data rates 20.2 - 28.5Gbps and sub-rates

Best,

Lucas

Hi Aiwen,

No, they are very similar devices that operate with different data rate ranges.

Best,

Lucas

Hi Aiwen,

It's difficult to give a specific reach for DAC cable applications because it depends greatly on the insertion loss profile of the cable used. If you have a model for the cable you are considering, I can provide an IBIS model for DS250DF410 so you can simulate the link.

I believe your second question has already been answered in the following thread: https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1194106/ds250df410-supported-optical-module-question

Best,

Lucas