EVALUATION KIT AVAILABLE 2 DS1339B Low-Current, I C, Serial Real-Time Clock for High-ESR Crystals General Description Benefits and Features The DS1339B serial real-time clock (RTC) is a low- Drop-In Replacement for DS1339 power clock/date device with two programmable time- Supports High-ESR Crystals Up to 100k to Allow of-day alarms and a programmable square-wave output. Crystals to be Optimized for Cost and Space 2 Address and data are transferred serially through an I C Completely Manages All Timekeeping Functions bus. The clock/date provides seconds, minutes, hours, Real-Time Clock Counts Seconds, Minutes, Hours, day, date, month, and year information. The date at the Date of the Month, Month, Day of the Week, and end of the month is automatically adjusted for months Year with Leap-Year Compensation Valid Up to with fewer than 31 days, including corrections for leap 2200 year. The clock operates in either the 24-hour or 12-hour Two Time-of-Day Alarms format with AM/PM indicator. The device has a built-in Programmable Square-Wave Output Signal power-sense circuit that detects power failures and auto- Low-Power Operation Extends Battery Backup Run Time matically switches to the backup supply, maintaining time, date, and alarm operation. Automatic Power-Fail Detect and Switch Circuitry Simple Serial Port Interfaces to Most Microcontrollers Applications 2 I C Serial Interface Hand helds (GPS, POS Terminals) Underwriters Laboratories (UL ) Recognized Consumer Electronics (Set-Top Box, Digital Recording, Network Appliance) Office Equipment (Fax / Printers, Copier) Medical (Glucometer, Medicine Dispenser) Telecommunications (Route rs, Switches, Servers) Ordering Information appears at end of data sheet. Other (Utility Meter, Vending Machine, Thermostat, Modem) UL is a registered trademark of Underwriters Laboratories Inc. Functional Diagram 32.768kHz SQW/INTB DS1339B 8.192kHz MUX/ 4.096kHz N BUFFER 1Hz X1 /4 /2 /4096 ALARMS, X2 OSCILLATOR TRICKLE CHARGER, AND AND CONTROL REGISTERS DIVIDER CLOCK AND V CC POWER CALENDAR REGISTERS CONTROL LOGIC CONTROL V BACKUP SERIAL BUS SCL INTERFACE AND USER BUFFER SDA ADDRESS (7 BYTES) REGISTER N 19-6682 Rev 1 4/152 DS1339B Low-Current, I C, Serial Real-Time Clock for High-ESR Crystals Absolute Maximum Ratings Voltage Range on Any Pin Relative to Ground .... -0.3V to +6.0V Lead Temperatur e (soldering, 10s) ................................. +300C Operating Temperature Range (noncondensing) ... -40C to +85C Soldering Temperature (reflow) ....................................... +260C Storage Temperature Range ............................ -55C to +125C 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) SOP Junction-to-Ambient Thermal Resistance ( ) ........ 206.3 C/W Junction-to- Case Thermal Resistance ( ) ................. 42 C/W JA 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 Supply Voltage V 1.71 3.3 5.5 V CC V 1.3 3.0 3.7 BACKUP Backup Supply Voltage V V 1.15 1.3 BACKMIN 0.7 x Logic 1 V 5.5 V IH V CC 0.3 x Logic 0 V -0.3 V IL V CC Power-Fail Voltage V 1.51 1.61 1.71 V PF DC Electrical Characteristics (V = MIN to MAX, V = MIN to MAX, T = -40C to +85C.) (Note 2) CC BACKUP A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Leakage I (Note 3) -0.1 0.1 A LI I/O Leakage I (Note 4) -0.1 0.1 A LO Logic 0 Out (SDA or SQW/INT) I (Note 4) 3 mA V = 0.4V, OL OL V V CC CCMIN Logic 0 Out (SQW/INT) I (Note 4) 250 A V = 0.2V, V = 0V, OL OL CC V V BAT BATMIN V Active Current I (Note 5) 450 A CC CCA V Standby Current I (Note 6) 200 A CC CCS Trickle-Charger Resistor Register 10h = A5h, V = Typ, R1 (Note 7) 200 CC V = 0V BACKUP Maxim Integrated 2 www.maximintegrated.com