Datasheet SDLS148 in a 501 KB PDF. The name contains only the document code, which follows the scheme Texas Instruments uses for logic family literature, leaving the actual device to be identified on the cover page. Content normally includes pin assignments, logic tables, absolute maximum ratings and package outlines. A technician can use it to trace signals through the chip and confirm which pins should carry power. Before replacing the part, check that its marking matches the variant in the document.
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.