Which is true about the operation of a digital buffer in circuits?

A digital buffer serves a critical role in circuit design, primarily characterized by its function of isolating the input from the output. This means that when a buffer is employed, the input signal can be maintained without being affected by the output load.

This isolation is particularly beneficial in digital circuits where different components might need to work at different voltage levels or where a high-impedance input needs to be protected from driving a low-impedance output. By providing this separation, the buffer helps in preventing signal degradation and allows for reliable signal transmission.

Furthermore, while some other characteristics such as amplification may be associated with similar devices like analog buffers, digital buffers specifically do not amplify but merely transfer the signal while maintaining its integrity and without interference from loading effects. Thus, the key purpose of a digital buffer is effectively encapsulated in its ability to isolate, ensuring that the integrity of the circuit is maintained.