A 20-TSSOP (0.173, 4.40mm Width) case is used for packaging. It is available in the case Tube. The maximum value for normal operation is 750MHz. As far as I can tell, it is mounted by Surface Mount. The electrical component has a classification of Multiplexer. To ensure reliable performance, the temperature should be set to 0°C~70°C. 3.135V~3.465V V power should work with it. Buffer IC is LVPECL that is output. There is a family of objects known as the ICS85357-01.
85357AG-01LF Features
The operating temperature of 0°C~70°C degrees
85357AG-01LF Applications
There are a lot of Renesas Electronics America Inc. 85357AG-01LF Clock Buffers & Drivers applications.