Si5350 Driven by MEMS oscillator
Use the SI5350B which supports VCXO directly (but datatsheet doesn't say how) or

Source: https://www.silabs.com/content/usergenerated/asi/cloud/attachments/siliconlabs/en/community/groups/timing/knowledge-base/_jcr_content/content/primary/blog/si5350_si5351_faq-1Xj5/Si5350-Si5351%20FAQ%20(v0.5).pdf
OR
this circuit with the SI5350A (which is a bit weird that they've capacitivly coupled the clock):

Source: https://www.silabs.com/documents/public/data-sheets/Si5350A-B.pdf
I would double check with Si before implementing an CMOS input as there is little info on the voltage limits of the pin or the internals for the clock.