PDF reference for the 74HC595, an 8-bit shift register with storage latches and three-state outputs, at 367 KB, filed under schematics. No manufacturer or package is stated in the name. Repair work on LED matrices, panel boards and indicator circuits often comes down to this chip, and the timing diagrams help confirm whether serial data, shift clock and latch clock are reaching it correctly. Pin numbering differs between DIP and surface-mount outlines only in shape, but always check the marking against 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 @cyberlanelectonik. Enginerys does not host this file.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.