PDF datasheet carrying the Texas Instruments literature code SDLS116, from the numbering block TI uses for its classic bipolar TTL logic families. The name does not say which device or package the 324 KB document covers, so open it to find out. Technicians use such sheets to read pin functions, check the absolute maximum ratings and compare input and output levels with oscilloscope readings. A datasheet also helps you choose a pin-compatible substitute when the original logic IC is obsolete or hard to source.
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.