A HCSL clock can be applied at IN2, IN1, or IN0 of Si5341. Regarding to the termination, just use an AC blocking cap in series with each input. This is present a high impedance to the PCB trace and should be what the customer needs since they have source side impedance matching. You can remove the 100 Ohm resistor between IN+ and IN- if the source is terminated properly.

Or you can put the 100 Ohm resistor on the other side of the AC coupling caps but keep the 100 Ohm resistor within 5 mm of the input pins.

Package: All devices with the QFN packages use NiPdAu plating.

Thickness: Following table gives details about the thickness of different materials:

Devices: All the devices from the Si534x (Si5340/41/42/44/45/46/47/48) family, the external crystal devices from the Si539x (Si5391/92/94/95/96/97) family and the Si5381/82/86 devices have the above terminal finish.

Package: All devices with the LGA packages use the Electroplated Ni/Au plating.

Thickness: Following table gives details about the thickness of different materials:

Devices: The integrated crystal devices from the Si539x (Si5392/94/95/95/97) and the Si5383/83/88/89 devices have the above terminal finish.

If more details are required regarding device composition, please refer our RFI portal. Following are the steps to access the same:

1. Go to https://www.silabs.com
2. Under the Community Support tab, click on Quality & Environmental Information
3. Scroll to bottom of the page and click on Search
4. You might need to create a login or enter your credentials if you already have one
5. Then you will enter the RFI portal. There you can enter the part number and find all the information about it

Now if the information you need is not present there, then you have to create a support request using the following link:

https://www.silabs.com/support