Datasheet for an IC identified only as SM8311, delivered as a 122 KB PDF; neither the manufacturer nor the function is in the name, so the document must be opened to confirm the device. A file of this size normally contains the pinout, block diagram, absolute maximum ratings and operating characteristics. In repair work it helps find power, clock and I/O pins, measure them on a suspect board and plan a replacement. Check the full chip marking and package against the sheet before using its data.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @datasheet_technar_org. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.