Datasheet identified by the Texas Instruments literature code SDLS136, a 284 KB PDF. The device is not named in the file name, so check the heading to learn which TTL logic part it describes. Documents in this SDLS range come from TI's legacy bipolar logic catalog. They are typically consulted for pinout, logic diagrams, absolute maximum ratings and timing. Make sure the part number and package on the board match those covered before you use it for probing or replacement.
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.