SDLS160 is the only identifier on this 286 KB PDF datasheet. That code matches the numbering Texas Instruments gives logic family publications, though the exact device has to be read from the document header. Inside you can expect the pin configuration, function description, DC and AC characteristics and mechanical data. It is useful for measuring inputs and outputs on a live board or confirming a substitute. Make sure the part marking and package on the PCB agree with the sheet before acting on it.
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.