The MAX31343 is a low-cost, extremely accurate, I²C real-time clock (RTC). The device incorporates a battery input and maintains accurate timekeeping when main power to the device is interrupted. The integration of the microelectromechanical systems (MEMS) resonator enhances the long-term accuracy of the device and eliminates the external crystal requirement in the system. The MAX31343 is available in the 8-pin WLP and TDFN packages.

The RTC maintains seconds, minutes, hours, day, date, month, year, and century information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year up to year 2199. The clock operates in the 24-hour format. Other features including two programmable time-of-day alarms, interrupt output, uncompensated programmable clock output, and temperature-compensated programmable square-wave output. Address and data are transferred serially through an I²C bidirectional bus. A voltage reference and comparator circuit monitors the status of V_CC to detect power failures and automatically switch to the backup supply when necessary. See the Typical Application Circuit for more details.