Datasheet stored as a 732 KB PDF, named SDLS186 with no further detail about the part. The SDLS code matches the literature numbering Texas Instruments gives its standard logic documentation, though the specific IC can only be confirmed by reading the cover. Expect pinout drawings, function tables, electrical characteristics and package dimensions. On the bench it supports checking supply and ground pins, comparing measured logic states against the table, and confirming a replacement shares the same pin mapping.
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.