PDF datasheet carrying the literature number SDLS099, roughly 437 KB in size, with no part number visible in the file name itself. Codes in the SDLS series are used by Texas Instruments for older bipolar logic documentation, so expect a TTL or LS-family device, but verify the title page first. Such a sheet supplies pin assignments, function tables, recommended operating conditions and switching characteristics, which help when probing inputs and outputs on a logic IC suspected of failure or when matching a substitute part during repair.
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.