Reference PDF for the 74LVC00A quad 2-input NAND gate, a larger 517 KB edition that likely includes several package options and detailed timing tables. It sits in the schematic category but is effectively a datasheet for the logic chip. Use it to locate the four gates on the pinout, confirm VCC and GND pins and check expected output levels while probing a powered board. Before replacing the part, match the marking and footprint on the PCB, as SO, TSSOP and smaller packages share the same logic function.
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.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.