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 o

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.)