Component datasheet, 738 KB in PDF format, whose file name holds just the code SDLS190 and no model or part designation. That code style corresponds to the literature numbers Texas Instruments assigns to standard logic documentation; the actual device has to be read from the document itself. Inside, a technician can usually find the pinout, logic diagram and DC characteristics. It helps when tracing a dead signal path through a gate, latch or counter and when checking that a cross-reference part is pin 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.