Click here to ask about the production status of specific part numbers. 2 MAX31328 3.5ppm, I C RTC with Integrated Crystal and Power Management General Description Benefits and Features 2 The MAX31328 is a low-cost, extremely accurate, I C real-time clock (RTC) with an integrated temperature- Highly Accurate RTC Completely Manages All compensated crystal oscillator (TCXO) and crystal. The Timekeeping Functions device incorporates a battery input and maintains Complete Clock Calendar Functionality, accurate timekeeping when main power to the device is Including Seconds, Minutes, Hours, Day, Date, interrupted. The integration of the crystal resonator Month, and Year with Leap-Year Compensation enhances the long-term accuracy of the device and Up to 2100 eliminates the external crystal requirement in the Low Timekeeping Battery Current of 660nA system. The MAX31328 is available in a 10-pin LGA Timekeeping Accuracy 3.5ppm package. (0.302 seconds/day) from -40C to +85C Two Time-of-Day Alarms The RTC maintains seconds, minutes, hours, day, date, Temperature-Compensated Programmable month, and year information. The date at the end of the Square-Wave Output month is automatically adjusted for months with fewer Register for Aging Trim than 31 days, including corrections for leap year. The RST Output/Pushbutton Reset Debounce Input clock operates in either 24-hour or 12-hour format with Digital Temperature Sensor with 3C Accuracy an AM/PM indicator. Two programmable time-of-day +2.3V to +5.5V Supply Voltage alarms and a programmable square-wave output are provided. Address and data are transferred serially 2 Simple Serial Interface Connects to through an I C bidirectional bus. A precision temperature-compensated voltage reference and Most Microcontrollers 2 comparator circuit monitors the status of V to detect I C Interface (400kHz) CC power failures and automatically switch to the backup supply when necessary. Additionally, the RST pin is Battery-Backup Input for Continuous Timekeeping monitored as a pushbutton input for generating a Low-Power Operation Extends Battery- microprocessor reset. Backup Run Time 3.3V Operation Applications Operating Temperature Range: -40C to +85C Servers 5mm x 5mm 10-Pin LGA Package Power Meters Telematics Global Positioning System Ordering Information and package information appear at end of data sheet. 19-100978 Rev 0 2/21 2 MAX31328 3.5ppm, I C RTC with Integrated Crystal and Power Management Simplified Block Diagram 32kHz X1 OSCILLATOR AND N CAPACITOR ARRAY CONTROL LOGIC/ SQUARE-WAVE BUFFER DIVIDER INT/SQW CONTROL INT/SQW X2 1Hz N V CC TEMPERATURE V ALARM, STATUS, AND BAT POWER CONTROL SENSOR CONTROL REGISTERS GND 1Hz CLOCK AND CALENDAR REGISTERS SCL I2C INTERFACE AND ADDRESS REGISTER DECODE USER BUFFER SDA (7 BYTES) V CC VOLTAGE REFERENCE RST DEBOUNCE CIRCUIT MAX31328 PUSHBUTTON RESET N www.maximintegrated.com Maxim Integrated 2