It's a electronic part of the 20-SSOP (0.209, 5.30mm Width) package. It is packaged as a Tube. It is normal to operate with a value of 166MHz. As you can see, it is mounted by Surface Mount. An electronic component classified as Fanout Buffer (Distribution) is categorized as such. Setting the temperature to -40°C~85°C will ensure reliable performance. Ideally, it should be able to operate from 2.3V~2.7V volts. Its output is CMOS, LVTTL. It is a member of the IDT49FCT20805 family. In this case, the electronic part belongs to the 49FCT series.
49FCT20805PYGI Features
The operating temperature of -40°C~85°C degrees
49FCT20805PYGI Applications
There are a lot of Renesas Electronics America Inc. 49FCT20805PYGI Clock Buffers & Drivers applications.