A 575 KB datasheet in PDF format carrying the literature number SDLS150. The device itself is not named in the file name; SDLS codes belong to the Texas Instruments standard logic documentation series, so check the first page for the part. Expect pinout, function description, DC and switching characteristics and package drawings. The sheet serves for probing logic levels, checking supply pins and finding an equivalent chip. Match the marking and package suffix of the original component against it.
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.