PDF with the Texas Instruments literature number SDLS113, a code from the range TI applies to its older 54/74 TTL logic datasheets. The file name gives only that code, so open the 458 KB document to see which device it covers. Its contents normally include the pinout, logic diagram, recommended operating conditions and switching data. A technician uses that information to confirm a suspected faulty gate, flip-flop or buffer by measurement and to choose a correct replacement for repair work on vintage hardware.
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.