A 382 KB PDF carrying the literature code SDLS161 and no part name. The SDLS prefix is the one Texas Instruments applies to its standard logic data sheets, so this should document a logic IC, identified on the cover. Technicians rely on such files for pinouts, truth tables, supply ratings and package outlines when checking a suspect chip or choosing an equivalent. Read the device number and ordering information first, then compare them with the markings on the component you are working on.
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.