Portuguese introductory study material on digital electronics, the first part of a course series judging by the numbering in the name.

Manual of digital electronics written in Spanish, a general reference rather than a schematic for any particular equipment.

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.

PDF for the 74AC00, a quad 2-input NAND gate in the advanced CMOS family, 302 KB, catalogued as a schematic; the name drops the digit before input, but the part number…

PDF reference titled around diodes and five-pin IC circuits, about 6.26 MB, filed as a schematic but not tied to any particular device or board by its name.

Data document for the 74LVC14A, described in the name as a faster hex inverter with Schmitt-trigger inputs, running from 3.3 V and tolerant of 5 V on its inputs.