Datasheet labelled with the Texas Instruments literature code SDLS114, part of the document series TI uses for its legacy TTL logic products. The name does not give a part number, so open the 241 KB PDF to confirm which device and package it covers. Repair technicians rely on such sheets for pinouts, function tables, supply ranges and output characteristics. With that data you can check signals on a working board against expected behaviour and choose an equivalent logic family when the original is no longer made.
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.