DS1343/DS1344 Low-Current SPI/3-Wire RTCs General Description Features The DS1343/DS1344 low-current real-time clocks (RTCs) S Low Timekeeping Current of 250nA (typ) are timekeeping devices that provide an extremely low S Compatible with Crystal ESR Up to 100kI standby current, permitting longer life from a backup S Versions Available to Support Either 6pF or supply source. The devices also support high-ESR 12.5pF Crystals crystals, broadening the pool of usable crystals for the devices. The clock/calendar provides seconds, minutes, S RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for Valid Through 2099 months with fewer than 31 days, including corrections S Power-Fail and Switch Circuitry for leap year. The clock operates in either 24-hour or S Three Operating Voltages 12-hour format with an AM/PM indicator. 1.8V 5% Address and data are transferred serially through an 3.0V10% SPI or 3-wire interface. Two programmable time-of-day 3.3V 10% alarms are provided. Each alarm can generate an inter- S Trickle-Charge Capability rupt on a combination of seconds, minutes, hours, and S Maintain Time Down to 1.15V (typ) day. Dont-care states can be inserted into one or more fields if it is desired for them to be ignored for the alarm S Support Motorola SPI Modes 1 and 3, or Standard condition. The time-of-day alarms can be programmed 3-Wire Interface to assert two different interrupt outputs, or they can be S Burst Mode for Reading/Writing Successive combined to assert one common interrupt output. Both Addresses in Clock/RAM interrupt outputs operate when the device is powered by S 96-Byte Battery-Backed NV RAM for Data Storage either V or V . CC BAT S Two Time-of-Day Alarms with Two Interrupt The devices are available in a lead-free/RoHS-compliant, Outputs 20-pin TSSOP or 14-pin TDFN package, and support a -40C to +85C extended industrial temperature range. S Industrial Temperature Range S 20-Pin TSSOP or 14-Pin TDFN Package Applications S Underwriters Laboratories (UL) Recognized Medical Handheld Devices Typical Operating Circuit Telematics Embedded Timestamping V CC R PU V CC INT INT0 X1 RST PF INT1 P DS1343 CE DS1344 Ordering Information appears at end of data sheet. X2 3-WIRE SCLK PORT SDI SDO V BAT SERMODE GND NOTE: SHOWN IN 3-WIRE I/O CONFIGURATION. For pricing, delivery, and ordering information, please contact Maxim Direct at 19-5801 Rev 2 10/14 1-888-629-4642, or visit Maxim Integrateds website at www.maximintegrated.com.DS1343/DS1344 Low-Current SPI/3-Wire RTCs ABSOLUTE MAXIMUM RATINGS Voltage Range on V or V Junction Temperature Maximum .....................................+150NC CC BAT Relative to Ground ............................................-0.3V to +6.0V Storage Temperature Range ............................ -55NC to +125NC Voltage Range on Any Nonpower Pin Lead Temperature (soldering, 10s) ................................+260NC Relative to Ground ................................ -0.3V to (V + 0.3V) Soldering Temperature (reflow) ......................................+260NC CC Operating Temperature Range .......................... -40NC to +85NC 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) TSSOP TDFN Junction-to-Ambient Thermal Resistance (B ) ..........91NC/W Junction-to-Ambient Thermal Resistance (B ) ..........54NC/W JA JA Junction-to-Case Thermal Resistance (B ) ...............20NC/W Junction-to-Case Thermal Resistance (B ) .................8NC/W JC JC 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 = -40C to +85C, unless otherwise noted.) (Note 2) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DS134 -18 1.71 1.8 5.5 Operating Voltage Range V DS134 -3 2.7 3.0 5.5 V CC DS134 -33 3.0 3.3 5.5 Minimum Timekeeping Voltage V T T = +25NC 1.15 1.3 V BAT MIN A Backup Voltage V 1.3 5.5 V BAT 0.7 x V + CC Logic 1 Input V V IH V 0.3 CC 0.3 x Logic 0 Input V -0.3 V IL V CC DC ELECTRICAL CHARACTERISTICS (V = V to +5.5V, V = +1.3V to +5.5V, T = -40C to +85C, unless otherwise noted.) (Notes 2, 3) CC CC(MIN) BAT A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Power-Supply Active Current I -3 or -33: f = 4MHz (Note 4) 400 FA CCA SCLK V = 3.63V 120 CC -33 V = V 160 CC CC(MAX) V = 3.3V 130 Power-Supply Standby Current CC I -3 FA CCS (Note 5) V = V 175 CC CC(MAX) V = 1.89V 120 CC -18 V = V 200 CC CC(MAX) Backup Leakage Current I V > V -100 +25 +100 nA BATLKG CC PF Backup Current (Oscillator Off) I 100 nA BAT T = +25NC, V = 0V, EOSC = 1 A CC V = 3V 250 BAT DS1343 V = V 500 Backup Current BAT BAT(MAX) I nA BAT1 (Note 6) V = 3V 350 BAT DS1344 V = V 600 BAT BAT(MAX) 2 Maxim Integrated