It is a part of the 64-VFQFN Exposed Pad package. This packaging has a Tape & Reel (TR)-shape, making it convenient to carry around. A reliable operation requires a temperature that is regulated to -40°C~85°C. It should work as long as you use a 3.135V~3.465VV power source. Among other things, it contains 64 terminations. 1.2V is the supply voltage that enables high efficiency. This number is part of the KSZ9563 family. 250mA supplies are available at the moment.
KSZ9563RNXI-TR Features
KSZ9563RNXI-TR Applications
There are a lot of Microchip Technology KSZ9563RNXI-TR Controllers Interface ICs applications.