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The other thing to note is that there are many signals in our system that need to be pulled up or pulled down. Of course, there are many reasons why the signal needs to be pulled up and down, but not all. The pull-down resistor pulls a simple input signal, and the current is tens of microamps or less, but pulling a driven signal will bring the current to milliamperes. Some people think that with the addition of the pull-down, the working state of these signals will be more stable, but this will increase the power consumption of the whole machine. So when designing, you need to figure out which signals must be pulled up. If you can not pull them up, try not to use them.

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