PDF datasheet of 645 KB carrying only the reference SDLS184 in its name, with no device or part number attached. This reference follows the Texas Instruments literature scheme for standard logic datasheets, so it most likely documents a TTL-type IC; read the header to be certain. Pinouts, logic symbols, truth tables and timing data are the usual contents. A technician relies on these when probing a suspect gate or register and when verifying that a replacement from another vendor is a genuine functional equivalent.
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.