Datasheet for the 245 octal bus transceiver in the SN54 series, the military temperature range counterpart of the common 74 series part, as a 150 KB PDF. The name does not say which logic family, such as LS, HC or ABT, is covered, so check the document itself. Expect the pinout with direction and output enable controls, a function table and electrical data. Technicians use it to follow bidirectional data buses, verify the direction pin state and find a shorted channel on older logic boards.
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.