鉴于很多电子初学者对什么是TTL电平,什么是CMOS电平不清楚.也不能了解CMOS电平与TTL电平的区别.特别在网上找到这篇TTL和CMOS电平总结.感谢作者的工作.-In view of the many electronic beginners What is TTL level CMOS level is not clear. Nor to understand the difference between the CMOS level and TTL level find online,