PDF datasheet carrying TI document code SDLS127, about 324 KB. As only the literature number is given, the exact logic IC must be confirmed by opening the file. SDLS-numbered sheets belong to Texas Instruments' legacy bipolar TTL range and often cover several family variants together. Use the pinout, truth table and electrical data when probing gates, checking supply pins or selecting a replacement. Make sure the package and part number on the PCB agree with the document first.
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.