Datasheet PDF of about 145 KB identified only by a literature code, with no part number in the name. SDLS-numbered documents come from Texas Instruments and generally cover TTL logic devices of the 74 series, but the specific chip covered has to be confirmed by opening the file. Typical contents include a function table, pinout diagram, recommended operating conditions and timing data. Once the part is identified, use it to check pin functions and logic levels, matching it against the actual IC marking.
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.