EVALUATION KIT AVAILABLE DS3232 2 Extremely Accurate I C RTC with Integrated Crystal and SRAM General Description Features Accuracy 2ppm from 0C to +40C The DS3232 is a low-cost temperature-compensated Accuracy 3.5ppm from -40C to +85C crystal oscillator (TCXO) with a very accurate, tempera- ture-compensated, integrated real-time clock (RTC) and Battery Backup Input for Continuous Timekeeping 236 bytes of battery-backed SRAM. Additionally, the Operating Temperature Ranges DS3232 incorporates a battery input and maintains accu- Commercial: 0C to +70C rate timekeeping when main power to the device is inter- Industrial: -40C to +85C rupted. The integration of the crystal resonator enhances 236 Bytes of Battery-Backed SRAM the long-term accuracy of the device as well as reduces Low-Power Consumption the piece-part count in a manufacturing line. The DS3232 Real-Time Clock Counts Seconds, Minutes, is available in commercial and industrial temperature Hours, Day, Date, Month, and Year with Leap Year ranges, and is offered in an industry-standard 20-pin, Compensation Valid Up to 2099 300-mil SO package. Two Time-of-Day Alarms The RTC maintains seconds, minutes, hours, day, date, Programmable Square-Wave Output month, and year information. The date at the end of the 2 Fast (400kHz) I C Interface month is automatically adjusted for months with fewer 3.3V Operation than 31 days, including corrections for leap year. The Digital Temp Sensor Output: 3C Accuracy clock operates in either the 24-hour or 12-hour format Register for Aging Trim with an AM/PM indicator. Two programmable time-of- RST Input/Output day alarms and a programmable square-wave output 300-Mil, 20-Pin SO Package are provided. Address and data are transferred serially 2 through an I C bidirectional bus. Underwriters Laboratories Recognized A precision temperature-compensated voltage refer- Ordering Information ence and comparator circuit monitors the status of V CC to detect power failures, to provide a reset output, and PIN- TOP PART TEMP RANGE to automatically switch to the backup supply when nec- PACKAGE MARK essary. Additionally, the RST pin is monitored as a DS3232S 0C to +70C 20 SO DS3232 pushbutton input for generating a P reset. DS3232SN -40C to +85C 20 SO DS3232N Applications Denotes a RoHS-compliant device that may include lead that is exempt under the RoHS requirements. Lead finish is JESD97 Functional Diagrams Servers Utility Power Meters Category e3, and is compatible with both lead-based and Telematics GPS lead-free soldering processes. A anywhere on the top mark denotes a RoHS-compliant device. Typical Operating Circuit Pin Configuration TOP VIEW V V CC CC R = t / C PU R B N.C. 1 20 SCL V CC N.C. 2 19 N.C. R R PU PU V 32kHz 3 18 SCL CC SCL INT/SQW SCL VCC 4 17 SDA SDA SDA 32kHz INT/SQW 5 16 V DS3232 BAT RST V RST BAT PUSH- RST 6 15 GND P N.C. BUTTON DS3232 N.C. N.C. N.C. 7 14 RESET N.C. N.C. N.C. N.C. 8 13 N.C. N.C. N.C. N.C. N.C. N.C. 9 12 N.C. N.C. N.C. GND N.C. 10 11 N.C. Pin Configurations appear at end of data sheet. Functional Diagrams continued at end of data sheet. SO UCSP is a trademark of Maxim Integrated Products, Inc. For pricing, delivery, and ordering information, please contact Maxim Direct 19-5337 Rev 5 7/10 at 1-888-629-4642, or visit Maxims website at www.maxim integrated.com. AVAILABLEDS3232 2 Extremely Accurate I C RTC with Integrated Crystal and SRAM ABSOLUTE MAXIMUM RATINGS Voltage Range on V , V , 32kHz, SCL, SDA, RST, Junction Temperature......................................................+125C CC BAT Storage Temperature Range ...............................-40C to +85C INT/SQW Relative to Ground.............................-0.3V to +6.0V Junction-to-Ambient Thermal Resistance ( ) (Note 1)..55.1C/W Lead Temperature (soldering, 10s) .................................+260C JC Soldering Temperature (reflow, 2 times max) ....................+260C Junction-to-Case Thermal Resistance ( ) (Note 1)..........24C/W JC (See the Handling, PC Board Layout, and Assembly section.) Operating Temperature Range (noncondensing) .............................................-40C to +85C 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.maxim-ic.com/thermal-tutorial. 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. RECOMMENDED OPERATING CONDITIONS (T = -40C to +85C, unless otherwise noted.) (Notes 2, 3) 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 Input SDA, SCL V V IH V 0.3 CC +0.3 x Logic 0 Input SDA, SCL V -0.3 V IL V CC ELECTRICAL CHARACTERISTICS (V = 2.3V to 5.5V, V = active supply (see Table 1), T = -40C to +85C, unless otherwise noted.) (Typical values are at V = CC CC A CC 3.3V, V = 3.0V, and T = +25C, unless otherwise noted.) (Notes 2, 3) BAT A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS V = 3.3V 200 32kHz output off CC Active Supply Current I A CCA (Notes 4, 5) V = 5.5V 325 CC 2 I C bus inactive, 32kHz V = 3.3V 120 CC Standby Supply Current I output off, SQW output off A CCS V = 5.5V 160 (Note 5) CC 2 V = 3.3V 500 I C bus inactive, 32kHz CC Temperature Conversion Current I A CCSCONV output off, SQW output off V = 5.5V 600 CC Power-Fail Voltage V 2.45 2.575 2.70 V PF ACTIVE SUPPLY (Table 1 ) (2.3V to 5.5V, T = -40C to +85C, unless otherwise noted) (Note 2) A Logic 1 Output, 32kHz Active supply > 3.3V, I = -1mA OH V 3.3V > active supply > 2.7V, 2.0 V OH I = -0.75mA OH 2.7V > active supply > 2.3V I = -0.14mA OH 2 Maxim Integrated