I have come across some text or blog before but I cannot find the source that: when we use 74HCT08 AND gate IC and for the logic inputs if we use pulldown resistors to prevent floating then we need to use the resistor pulldown resistor values Rp low such that the input should not rise over 0.9V.

Regarding a such input as hand drawn below:

[![enter image description here](https://i.stack.imgur.com/WtipM.png)](https://i.stack.imgur.com/WtipM.png)

Why does the value of resistor matter and how could high values make the input higher than 0.9V when the switch is open?