It's a electronic part of the 44-VFQFN Exposed Pad package. The package is in the form of a Tape & Reel (TR). Under normal circumstances, 1.25GHz is the maximum value. As far as I can tell, it is mounted by Surface Mount. Electrical components classified as Fanout Buffer (Distribution), Multiplexer, Translator are classified as such. To ensure reliable performance, the temperature should be set to -40°C~85°C. Ideally, it should be able to operate from 1.71V~3.63V volts. It is placed in the way of Surface Mount. There is a value of CML, HCSL, LVCMOS, LVDS, LVPECL as the output. This is a member of the family of SI53315.
SI53315-B-GMR Features
The operating temperature of -40°C~85°C degrees
SI53315-B-GMR Applications
There are a lot of Silicon Labs SI53315-B-GMR Clock Buffers & Drivers applications.