DS1339 2 I C Serial Real-Time Clock GENERAL DESCRIPTION BENEFITS AND FEATURES The DS1339 serial real-time clock (RTC) is a low- Completely Manages All Timekeeping power clock/date device with two programmable time- Functions of-day alarms and a programmable square-wave o Real-Time Clock Counts Seconds, output. Address and data are transferred serially 2 Minutes, Hours, Date of the Month, through an I C bus. The clock/date provides seconds, minutes, hours, day, date, month, and year Month, Day of the Week, and Year information. The date at the end of the month is with Leap-Year Compensation Valid automatically adjusted for months with fewer than 31 Up to 2100 days, including corrections for leap year. The clock o Two Time-of-Day Alarms operates in either the 24-hour or 12-hour format with o Programmable Square-Wave Output AM/PM indicator. The DS1339 has a built-in power- sense circuit that detects power failures and o Oscillator Stop Flag automatically switches to the backup supply, Interfaces to Most Microcontrollers maintaining time, date, and alarm operation. 2 o I C Serial Interface APPLICATIONS Low-Power Operation Extends Battery Handhelds (GPS, POS Terminals) Backup Run Time Consumer Electronics (Set-Top Box, Digital o Automatic Power-Fail Detect and Recording, Network Appliance) Switch Circuitry Office Equipment (Fax/Printers, Copier) o Trickle-Charge Capability Medical (Glucometer, Medicine Dispenser) Telecommunications (Routers, Switches, Servers) Underwriters Laboratories (UL) Other (Utility Meter, Vending Machine, Thermostat, Recognized Modem) Surface-Mount Package with an Integrated Crystal (DS1339C Saves Pin Configurations appear at end of data sheet. Additional Space and Simplifies Design ORDERING INFORMATION PART TEMP RANGE VOLTAGE (V) PIN-PACKAGE TOP MARK DS1339C-2 -40C to +85C 2.0 16 SO (300 mils) DS1339C-2 DS1339C-3 -40C to +85C 3.0 16 SO (300 mils) DS1339C-3 DS1339C-33 -40C to +85C 3.3 16 SO (300 mils) DS1339C-33 DS1339U-2+ -40C to +85C 2.0 8 SOP 1339 rr-2 DS1339U-3+ -40C to +85C 3.0 8 SOP 1339 rr-3 DS1339U-33+ -40C to +85C 3.3 8 SOP 1339 rr-33 +Denotes a lead(Pb)-free/RoHS-compliant package. Denotes a RoHS-compliant device that may include lead that is exempt under the RoHS requirements. The lead finish is JESD97 category e3, and is compatible with both lead-based and lead-free soldering processes. A + anywhere on the top mark indicates a lead(Pb)-free device. A denotes a RoHS-compliant device. rr = second line, revision code 19-5770 Rev 3/15 1 of 20 2 DS1339 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 Lead Temperature (soldering, 10s)...+260C Soldering Temperature (reflow)..+260C 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. PACKAGE THERMAL CHARACTERISTICS (Note 1) SOP Junction-to-Ambient Thermal Resistance ( ).....206.3 C/W JA Junction-to-Case Thermal Resistance ( )42C/W JC SO Junction-to-Ambient Thermal Resistance ( )..73C/W JA Junction-to-Case Thermal Resistance ( )23C/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.maxim-ic.com/thermal-tutorial. RECOMMENDED DC OPERATING CONDITIONS (T = -40C to +85C) (Note 2) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DS1339-2 1.8 2.0 5.5 DS1339-3 2.7 3.0 5.5 Supply Voltage V V CC DS1339-33 2.97 3.3 5.5 Backup Supply Voltage V 1.3 3.0 3.7 V BACKUP 0.7 x V + CC Logic 1 V V IH V 0.3 CC +0.3 x Logic 0 V -0.3 V IL V CC DS1339-2 1.58 1.70 1.80 Power-Fail Voltage V DS1339-3 2.45 2.59 2.70 V PF DS1339-33 2.70 2.85 2.97 2 of 20