Datasheet stored as a 374 KB PDF and named SDLS172, which is a document code rather than a part designation. Texas Instruments uses the SDLS literature range for standard logic family datasheets, so the first page will show which IC is covered. Expect a pinout, logic symbol, truth table and voltage and timing limits. These details help when testing a chip in circuit, interpreting logic probe readings, and confirming that a substitute shares the same function, package and pin numbering before soldering.
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.