Datasheet stored under the Texas Instruments document code SDLS112, part of the literature series for classic TTL logic. The name does not state which integrated circuit or package the 268 KB PDF describes, so open the cover page to find out. Datasheets of this kind list the terminal assignments, truth tables, supply voltage limits and propagation delays. Those figures let you compare measured logic levels with the specified ones and confirm that a substitute part from another family is a valid replacement.
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.