Designed to perform critical time-keeping functions in a range of applications, these small, highly efficient RTC/calendars fit nearly anywhere and cut power demands by as much as 60 percent.
The NXP PCF8523 and PCF2123 are CMOS devices that combine a real-time clock (RTC) and a calendar. Optimized for low power consumption, they operate at a current of less than 100 nA with a 2.0 V power supply, and consume less than 0.2μW of power.
Both devices are cased in tiny leadless packages that save space in compact designs. This makes them well suited for handheld and battery-operated applications, including blood-pressure monitors and other home-use medical devices, pocket calculators, portable phones, and PDAs.
They are also an excellent choice for white goods, such as small and large home appliances, metering units, Secure Key Credit cards, wireless sensors and building security systems and other industrial systems. Both devices can be powered by a very small battery cell or a super-cap.