2 DS3231M 5ppm, I C Real-Time Clock General Description Benefits and Features 2 The DS3231M is a low-cost, extremely accurate, I C real- Highly Accurate RTC With Integrated MEMS time clock (RTC). The device incorporates a battery input Resonator Completely Manages All Timekeeping and maintains accurate timekeeping when main power to Functions the device is interrupted. The integration of the microelec- Complete Clock Calendar Functionality Including tromechanical systems (MEMS) resonator enhances the Seconds, Minutes, Hours, Day, Date, Month, and long-term accuracy of the device and reduces the piece- Year, with Leap-Year Compensation Up to Year part count in a manufacturing line. The DS3231M is avail- 2100 able in the same footprint as the popular DS3231 RTC. Timekeeping Accuracy 5ppm (0.432 Second/Day) from -45C to +85C The RTC maintains seconds, minutes, hours, day, date, Footprint and Functionally Compatible to DS3231 month, and year information. The date at the end of the Two Time-of-Day Alarms month is automatically adjusted for months with fewer 1Hz and 32.768kHz Outputs than 31 days, including corrections for leap year. The Reset Output and Pushbutton Input with Debounce clock operates in either the 24-hour or 12-hour format Digital Temp Sensor with 3C Accuracy with an AM/PM indicator. Two programmable time-of- +2.3V to +5.5V Supply Voltage day alarms and a 1Hz output are provided. Address and 2 data are transferred serially through an I C bidirectional Simple Serial Interface Connects to Most bus. A precision temperature-compensated voltage refer- Microcontrollers 2 ence and comparator circuit monitors the status of V Fast (400kHz) I C Interface CC to detect power failures, to provide a reset output, and to Battery-Backup Input for Continuous Timekeeping automatically switch to the backup supply when neces- Low Power Operation Extends Battery-Backup sary. Additionally, the RST pin is monitored as a pushbutton Run Time input for generating a microprocessor reset. See the Operating Temperature Range: -40C to +85C Block Diagram for more details. 8-Pin or 16-Pin SO Packages Applications Underwriters Laboratories (UL) Recognized Power Meters Industrial Applications Typical Operating Circuit Ordering Information +3.3V +3.3V PART TEMP RANGE PIN-PACKAGE DS3231MZ+ -45NC to +85NC 8 SO DS3231MZ/V+ -45NC to +85NC 8 SO DS3231M+ -45NC to +85NC 16 SO SCL I/O PORT +Denotes a lead(Pb)-free/RoHS-compliant package. SDA /V denotes an automotive qualified part. 32KHZ V BAT INT/SQW INTERRUPTS RST CPU DS3231M Underwriters Laboratories is a registered certification mark of Underwriters Laboratories Inc. 19-5312 Rev 7 3/152 DS3231M 5ppm, I C Real-Time Clock Absolute Maximum Ratings Voltage Range on Any Pin Relative to GND ........-0.3V to +6.0V Junction Temperature .....................................................+150NC Operating Temperature Range .......................... -45NC to +85NC Lead Temperature (soldering, 10s) ................................+300NC Storage Temperature Range ............................ -55NC to +125NC Soldering Temperature (reflow) ......................................+260NC Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Package Thermal Characteristics (Note 1) 8 SO 16 SO Junction-to-Ambient Thermal Resistance (q ) ........120C/W Junction-to-Ambient Thermal Resistance (q ) ..........90C/W JA JA Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. Recommended Operating Conditions (T = -45NC to +85NC, unless otherwise noted.) (Note 2) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS V 2.3 3.3 5.5 CC Supply Voltage V V 2.3 3.0 5.5 BAT 0.7 x V + CC Logic 1 V V IH V 0.3 CC 0.3 x Logic 0 V -0.3 V IL V CC Electrical CharacteristicsFrequency And Timekeeping (V or V = +3.3V, T = -45NC to +85NC, unless otherwise noted. Typical values are at V = +3.3V, V = +3.0V, and CC BAT A CC BAT T = +25NC, unless otherwise noted.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 1Hz Frequency Tolerance Df/f Measured over R 10s interval Q5 ppm OUT 1Hz Frequency Stability vs. V CC Df/V Q1 ppm/V Voltage Seconds/ Timekeeping Accuracy tK Q0.432 A Day 32kHz Frequency Tolerance Df/f Q2.5 % OUT DC Electrical CharacteristicsGeneral (V = +2.3V to +5.5V, T = -45NC to +85NC, unless otherwise noted. Typical values are at V = +3.3V, V = +3.0V, and T = CC A CC BAT A +25NC, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Active Supply Current V = +3.63V 200 CC 2 (I C Active: Includes I A CCA V = V 300 Temperature Conversion Current) CC CCMAX Standby Supply Current V = +3.63V 130 CC 2 (I C Inactive: Includes I A CCS V = V 200 Temperature Conversion Current) CC CCMAX V = +3.63V 575 Temperature Conversion Current CC I A CCSCONV 2 (I C Inactive) V = V 650 CC CCMAX Maxim Integrated 2 www.maximintegrated.com