How To Choose a Pull-Up Resistor Value. Rule 1: The value can’t be too high. The higher the pull-up value, the lower the voltage on the input becomes. It’s important that the voltage is high enough for the chip to see it as a HIGH, or logical 1, input. For example, if you use a CD4017 with a power supply of 10V, it requires a minimum of 7V.. A pull-up resistor allow controlled current flow from supply voltage source to the digital input pins, where the pull-down resistors could effectively control current flow from digital pins to the ground. At the same time both resistors, pull-down and pull-up resistors hold the digital state either Low or High.
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A pull-down resistor is used in electronic logic circuits to ensure a known state for a signal. It is usually used in combination with transistors and switches to ensure the voltage between ground and V cc is actively controlled when the switch is open (similar to a pull-up resistor ). This can sound confusing at first, so let’s go into an.. And when connected to switches such as pushbuttons, both pull up and pull down resistors can switch states so that a pull up resistor can be bring a pin to a LOW state and a pull down resistor can bring a pin to a HIGH state. The resistor value used for pull up and pull down resistors is usually 10KΩ or higher. Typical values are 10KΩ or 100KΩ.
