A 78.7 KB PDF datasheet filed under literature number SDLS203. The name carries no part number, revision or package, so the device is unknown until the document is opened; the code matches the pattern of Texas Instruments logic literature. A technician reads such a sheet for pin functions, logic behaviour and voltage limits when diagnosing a stuck output or a dead line. Any PDF viewer will display it. Verify that the part on the PCB matches the one described inside.
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.