A datasheet in PDF form, 288 KB, whose file name SDLS170 is a bare literature code. Texas Instruments assigns SDLS numbers to its standard logic documentation, so this probably describes a logic family IC that the cover page will name. Usual contents include the pin diagram, truth table, timing characteristics and absolute maximum ratings. Technicians refer to them to confirm correct supply levels, interpret signals on enable and clock pins, and make sure any replacement is pin and function compatible.
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.