Datasheet for the SM5813AF device, supplied as a 42.5 KB PDF. The name gives only the part number with an AF suffix, likely a package designation, and nothing about the manufacturer or revision. Repair work typically draws on such a document for pin numbering, supply and signal levels, absolute maximum ratings and reference circuits when tracing a fault around the chip. Read it with any PDF viewer, and before substituting a part make sure the package and pin count match the original on the board.
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.