Datasheet stored as a 258 KB PDF and labelled SDLS202. The device is not identified by the file name; SDLS codes are characteristic of Texas Instruments logic datasheets, so check the cover page for the actual part. Typical sections include the logic symbol, function table, recommended operating conditions and package outlines. With these a technician can confirm expected states on each pin while measuring in circuit. Compare the board marking and package type with the document before substituting a component.
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.