Bilingual edition: English is preserved and Chinese follows each unit. Terminology uses the confirmed v20260916 glossary; automated semantic review remains traceable.
中英双语版:英文原文完整保留,中文紧随对应单元;术语采用 v20260916 确认表,自动语义审校结果可追溯。

IC7420 Dual 4-Input NAND Gate

IC7420 双4输入NAND逻辑门

The 7420, 74H20, 74S20, 74LS20 share this geometry and function.

7420、74H20、74S20、74LS20具有相同的几何结构和功能。
Basic Gates
基本逻辑门
NAND Gate
与非门
Index

Electronics concepts

Digital Circuits
索引 电子学概念 数字电路
 
HyperPhysics*****Electricity and magnetism
HyperPhysics ***** 电磁学
R Nave
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