DS1339A 2 Low-Current, I C, Serial Real-Time Clock General Description Benefits and Features The DS1339A serial real-time clock (RTC) is a low- S Drop-In Replacement for DS1339 power clock/date device with two programmable time- S Real-Time Clock (RTC) Counts Seconds, Minutes, of-day alarms and a programmable square-wave output. Hours, Day, Date, Month, and Year with Leap-Year 2 Address and data are transferred serially through an I C Compensation Up to 2200 bus. The clock/date provides seconds, minutes, hours, Two Time-of-Day Alarms day, date, month, and year information. The date at the Programmable Square-Wave Output end of the month is automatically adjusted for months S Supports Crystals with Up to 60k ESR with fewer than 31 days, including corrections for leap S Maintains Time Even During Power Outage with year. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. The DS1339A has a built- Backup Supply Pin Automatic Power-Fail Detect and Switch in power-sense circuit that detects power failures and automatically switches to the backup supply, maintaining Circuitry Trickle-Charge Capability time, date, and alarm operation. Supports V from 1.8V to 5V CC Applications Oscillator Stop Flag Oscillator Runs Down to 1.15V Handhelds (GPS, POS Terminals) S Interfaces with a Wide Range of Microcontrollers Consumer Electronics (Set-Top Box, Digital 2 I C Serial Interface Recording, Network Appliance) S Underwriters Laboratories (UL) Recognized Office Equipment (Fax/Printers, Copier) Medical (Glucometer, Medicine Dispenser) Ordering Information appears at end of data sheet. Telecommunications (Routers, Switches, Servers) For related parts and recommended products to use with this part, refer to www.maximintegrated.com/DS1339A.related. Other (Utility Meter, Vending Machine, Thermostat, Modem) Functional Diagram 32.768kHz SQW/INTB DS1339A 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 CONTROL CALENDAR REGISTERS CONTROL LOGIC V BACKUP SCL SERIAL BUS INTERFACE AND USER BUFFER SDA (7 BYTES) ADDRESS REGISTER N For pricing, delivery, and ordering information, please contact Maxim Direct at 19-6425 Rev 2 1/15 1-888-629-4642, or visit Maxim Integrateds website at www.maximintegrated.com.DS1339A 2 Low-Current, I C, Serial Real-Time Clock ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground ....-0.3V to +6.0V Lead Temperature (soldering, 10 seconds) ...................+300NC Operating Temperature Range (Noncondensing) ....-40NC to +85NC Soldering Temperature (reflow) ......................................+260NC Storage Temperature Range ............................ -55NC to +125NC Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional opera- tion 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 (B ) .....206.3NC/W JA Junction-to-Case Thermal Resistance (B ) ...............42NC/W 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 = -40NC to +85NC, 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 = -40NC to +85NC.) (Note 2) CC BACKUP A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Leakage I (Note 3) -0.1 0.1 FA LI I/O Leakage I (Note 4) -0.1 0.1 FA LO Logic 0 Out (SDA or SQW/INT) V = 0.4V, I (Note 4) 3 mA OL OL V R V CC CCMIN Logic 0 Out (SQW/INT) I (Note 4) 250 V = 0.2V, V = 0V, FA OL OL CC V R V BAT BATMIN V Active Current I (Note 5) 450 FA CC CCA V Standby Current I (Note 6) 200 FA CC CCS Trickle-Charger Resistor Register 10h = A5h, V = Typ, R1 (Note 7) 200 I CC V = 0V BACKUP Maxim Integrated 2