Texas Instruments literature number SDLS135, supplied as a 289 KB PDF datasheet. The name carries no part number, so the covered logic device has to be confirmed from the document itself. TI uses the SDLS prefix for its classic 54/74 TTL family datasheets. Expect pin configurations, function tables, recommended operating conditions and switching data, which help when testing gates or replacing a failed chip. Match the package marking to the listed devices before relying on the pinout.
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.