PDF datasheet carrying the code SDLS145, 306 KB. The name identifies only the document, using the numbering Texas Instruments applies to its logic family data sheets, so the specific IC must be confirmed on page one. It should contain the pin configuration, function table, voltage and current limits and package outlines. Keep it open when probing a logic device on a powered board or checking for a short to ground. Make sure the part marking matches the document before relying on its pinout.
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.