DS1337 2 I C Serial Real-Time Clock www.maxim-ic.com GENERAL DESCRIPTION FEATURES The DS1337 serial real-time clock is a low-power Real-Time Clock (RTC) Counts Seconds, clock/calendar with two programmable time-of-day Minutes, Hours, Day, Date, Month, and Year alarms and a programmable square-wave output. with Leap-Year Compensation Valid Up to Address and data are transferred serially through an 2100 2 IC bus. The clock/calendar provides seconds, Available in a Surface-Mount Package with an minutes, hours, day, date, month, and year Integrated Crystal (DS1337C) information. The date at the end of the month is 2 I C Serial Interface automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock Two Time-of-Day Alarms operates in either the 24-hour or 12-hour format with Oscillator Stop Flag AM/PM indicator. Programmable Square-Wave Output The device is fully accessible through the serial Defaults to 32kHz on Power-Up 2 interface while V is between 1.8V and 5.5V. I C CC Available in 8-Pin DIP, SO, or SOP operation is not guaranteed below 1.8V. Timekeeping operation is maintained with V as low CC -40C to +85 C Operating Temperature Range as 1.3V. ORDERING INFORMATION APPLICATIONS TOP Handhelds (GPS, POS Terminal, MP3 Player) PART TEMP RANGE PIN-PACKAGE MARK Consumer Electronics (Set-Top Box, VCR/Digital DS1337+ -40C to +85C 8 DIP (300 mils) DS1337 Recording) DS1337S+ -40C to +85C 8 SO (150 mils) DS1337 Office Equipment (Fax/Printer, Copier) DS1337U+ -40C to +85C 8 SOP 1337 Medical (Glucometer, Medicine Dispenser) DS1337C -40C to +85C 16 SO (300 mils) DS1337C Telecommunications (Router, Switch, Server) + Denotes a lead(Pb)-free/RoHS-compliant device. Other (Utility Meter, Vending Machine, Thermostat, Functional Diagrams Denotes a RoHS-compliant device that may include lead that is Modem) exempt under the RoHS requirements. The lead finish is JESD97 category e3, and is compatible with both lead-based and lead-free soldering processes. TYPICAL OPERATING CIRCUIT A + anywhere on the top mark denotes a lead-free device. A denotes a RoHS-compliant device. Pin Configurations appear at end of data sheet. Pin Configurations appear at end of data sheet. Functional Diagrams continued at end of data sheet. UCSP is a trademark of Maxim Integrated Products, Inc. For pricing, delivery, and ordering information, please contact Maxim Direct 19-4652 7/09 at 1-888-629-4642, or visit Maxims website at www.maxim integrated.com. AVAILABLE2 DS1337 I C Serial Real-Time Clock ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground...-0.3V to +6.0V Operating Temperature Range (Noncondensing).-40C to +85C Storage Temperature Range..-55C to +125C Soldering TemperatureSee IPC/JEDEC J-STD-020 Specification 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 the absolute maximum rating conditions for extended periods may affect device reliability. RECOMMENDED DC OPERATING CONDITIONS (T = -40C to +85C) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS V Full operation 1.8 3.3 5.5 V CC V Supply Voltage CC Timekeeping (Note V 1.3 1.8 V CCT 5) SCL, SDA 0.7 x V V + 0.3 CC CC Logic 1 V V IH INTA, SQW/INTB 5.5 Logic 0 V -0.3 +0.3 x V V IL CC DC ELECTRICAL CHARACTERISTICSFull Operation (V = 1.8V to 5.5V, T = -40C to +85C.) (Note 1) CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Leakage I (Note 2) -1 +1 A LI I/O Leakage I (Note 3) -1 +1 A LO Logic 0 Output (V = 0.4V) I (Note 3) 3 mA OL OL Active Supply Current I (Note 4) 150 A CCA Standby Current I (Notes 5, 6) 1.5 A CCS DC ELECTRICAL CHARACTERISTICS--Timekeeping (V = 1.3V to 1.8V, T = -40C to +85C.) (Note 1) CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Timekeeping Current I (Notes 5, 7, 8, 9) 425 600 nA CCTOSC (Oscillator Enabled) Data-Retention Current I (Notes 5, 9) 100 nA CCTDDR (Oscillator Disabled)