positiveedgetriggered

Positive edge triggered refers to a property of certain digital circuits and storage elements that cause a response or state change only when a signal transitions from low to high, i.e., on the rising edge of a clock or input waveform. This behavior contrasts with level-sensitive devices that respond continuously while the signal remains high or low.

In practice, many memory and timing elements called edge-triggered flip-flops are designed to be sensitive to the rising edge. A common implementation uses two level-sensitive latches arranged as a master-slave configuration: when the clock is low, the master latch captures the input; on the rising edge, the data is transferred to the output through the slave latch and then remains stable until the next rising edge. As a result, the stored value is updated only at discrete moments, enabling synchronous operation in digital systems.

This approach is often contrasted with negative-edge triggering, where the response occurs on the falling edge (high-to-low transition) of the clock. Positive edge triggering is widely used in synchronous circuits, microprocessors, and memory devices to ensure predictable timing and to minimize unintended state changes during the rest of the clock cycle. Timing requirements such as setup time, hold time, and clock propagation delay are important for reliable operation.

While robust against slow clock transitions, positive edge-triggered devices still require clean, well-defined edges to avoid glitches and metastability. They are widely available in standard digital families and are commonly used for data sampling and state storage in sequential logic.