74HC/LS/HCT/F系列芯片的区别 LS是低功耗肖特基，HC是高速COMS。LS的速度比HC略快。HCT输入输出与LS兼容，但是功耗低；F是高速肖特基电路；(The difference between 74HC/LS/HCT/F series chips LS is low power Schottky, HC is high speed COMS. The speed of LS is faster than that of HC. The HCT input and output

74系列芯片总汇 、很全的，适合电子专业新手编程及电路设计参考。(74 series chips are very comprehensive, suitable for novice electronic programming and circuit design reference.)