An buffered low output is used in bi-directional buffers like I2C. This helps the buffer re-drive with locking up by re-driving its own input.

What is the purpose of open-drain interrupts? Open-drain interrupts are used to communicate some type of indicator or flag back to the MCU. It signals the brains of system that something has happened to one or more peripheral devices in a design.

Input high voltage, input low voltage, output high voltage, output low voltage. Why do these terms matter, and how to design electrical systems with this electrical characteristics in mind.