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Input pins often have a huge input impedance, in the range of mega-ohms. So only very miniscule current can and will flow into or out of them. This means that only miniscule electrical noise is sufficient to change the voltage on the pin. This electrical noise can come from e.g. RF interference picked up from the environment. The pin and connected lines ...


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The input is floating because it does not have a logic voltage driving it with a valid logic low or logic high. The resistor provides that connection to a logic voltage. It can connect it to a logic high voltage (pull-up resistor) or a logic low voltage (pull-down resistor). If it's the only connection to the input then the resistor does the same job as a ...


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It's very simple. simulate this circuit – Schematic created using CircuitLab Figure 1. A CMOS input and one with a pull-down resistor. The typical input is very high impedance - so high that we can usually assume that no current flows into it in the steady state. The input has some very small capacitance, however, and this needs to be taken into ...


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