SN74AVC4T774: 关于AVC系列和LVC系列电压转换芯片的传播延时问题

1 & 2) The differences can be attributed to transistor type and not design/architecture. The transistors in AVC cannot be found in LVC because both support different voltage ranges. AVC uses transistors that work best when using voltages in the 1.8V to 3.3V range. While LVC level translators can support voltages as low as 1.65V, they work best when using voltages in the 3.3V and 5V range. Actually you will see the propagation delay values from 3.3V to 5V in LVC are similar to AVC when operating from 1.8V to 3.3V. 

3) That's correct.

4) [FAQ] How does a slow or floating input affect a CMOS device?