What is the Difference Between an Active Low Pin and an Active High Pin in Digital Circuits and Which One is More Used?
In digital circuits, pins can be configured as either active low or active high. The difference between the two is in how the logic level is represented on the pin.
Active Low Pin
An active low pin is a pin that is normally high and goes low when it is activated. This means that when the logic level on the pin is high, the pin is inactive, and when the logic level on the pin is low, the pin is active.
Active High Pin
An active high pin is a pin that is normally low and goes high when it is activated. This means that when the logic level on the pin is low, the pin is inactive, and when the logic level on the pin is high, the pin is active.
Which One is More Used?
Both active low pins and active high pins are commonly used in digital circuits. However, active high pins are more commonly used than active low pins. This is because active high pins are easier to interface with other devices, such as microcontrollers and logic gates.
Related Questions
- What is the purpose of a pull-up resistor in a digital circuit?
- A pull-up resistor is used to ensure that a pin is pulled to a high logic level when it is not being driven.
- What is the difference between a sinking output and a sourcing output?
- A sinking output is an output that can only sink current, while a sourcing output is an output that can only source current.
- What is the advantage of using a tri-state buffer?
- A tri-state buffer is an output that can be in one of three states: high, low, or high-impedance. This allows multiple outputs to be connected to the same bus without causing contention.
- What is the purpose of a Schmitt trigger?
- A Schmitt trigger is a circuit that converts a slowly changing analog signal into a digital signal.
- What is the difference between a combinational circuit and a sequential circuit?
- A combinational circuit is a circuit whose output is determined only by its current inputs, while a sequential circuit is a circuit whose output is also determined by its past inputs.
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