Devices using an internal core voltage regulator require an external filter capacitor for regulator stability. Because the core voltage is turned off during Deep Sleep, this filter capacitor will end up discharging. Energy is used each cycle for recharging the core voltage filter capacitor, creating a break-even point where traditional Sleep mode may provide better efficiency for applications with short time periods (below 20 seconds) between wake-up events. Families without the core voltage regulator, such as the PIC24F16KA102, will not need to use any additional power on wake-up.