The DDCA detects rising input transitions with two internal voltage references and two comparators per channel. After the voltage on a data line crosses the first threshold (VTRIPL), the boost pull-up current source is activated to speed transition. After the voltage crosses the second threshold (VTRIPH), the boost pull-up current source is de-activated, leaving an active pull-up current of 275A on the line. When both channels are HIGH, the pull-up current for both lines is reduced to 100A to save power. Internal logic ensures that the active and boost pull-up current sources are not activated during downward transitions.