It is packaged using the Tape & Reel (TR) method since it is a clock IC. The number of uPs/uCs/Peripheral IC this time clock generator incorporates is CLOCK GENERATOR, PROCESSOR SPECIFIC.
SI5351A-B08623-GTR Features
SI5351A-B08623-GTR Applications
There are a lot of Silicon Labs SI5351A-B08623-GTR Clock Generators applications.