DS1339 I²C Serial Real-Time Clock
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DS1339 I2C Serial Real-Time Clock GENERAL DESCRIPTION The DS1339 serial real-time clock (RTC) is a lowpower clock/date device with two programmable timeof-day alarms and a programmable square-wave output. Address and data are transferred serially 2 through an I C bus. The clock/date provides seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. The DS1339 has a built-in powersense circuit that detects power failures and automatically switches to the backup supply, maintaining time, date, and alarm operation. Completely Manages All Timekeeping Functions o Real-Time Clock Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap-Year Compensation Valid Up to 2100 o 56-Byte, Battery-Backed, GeneralPurpose RAM with Unlimited Writes o Programmable Square-Wave Output Signal Simple Serial Port Interfaces to Most Microcontrollers o I2C Serial Interface Low Power Operation Extends Battery Backup Run Time o Consumes Less than 500nA in Battery-Backup Mode with Oscillator Running o Automatic Power-Fail Detect and Switch Circuitry 8-Pin DIP and 8-Pin SO Minimizes Required Space Optional Industrial Temperature Range: -40°C to +85°C Supports Operation in a Wide Range of Applications Underwriters Laboratories® (UL) Recognized APPLICATIONS Handhelds (GPS, POS Terminals) Consumer Electronics (Set-Top Box, Digital Recording, Network Appliance) Office Equipment (Fax/Printers, Copier) Medical (Glucometer, Medicine Dispenser) Telecommunications (Routers, Switches, Servers) Other (Utility Meter, Vending Machine, Thermostat, Modem) Pin Configurations appear at end of data sheet. PIN-PACKAGE 16 SO (300 mils) 16 SO (300 mils) 16 SO (300 mils) 8 µSOP 8 µSOP 8 µSOP +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

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)………………………………………………………….-40°C to +85°C Storage Temperature Range………………………………………………………………………………..-55°C to +125°C Lead Temperature (soldering, 10s)...…………………………………………………………………………………+260°C Soldering Temperature (reflow).……………………………………………………………………………………….+260°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional...

DS1339 I C Serial Real-Time Clock DC ELECTRICAL CHARACTERISTICS (VCC = MIN to MAX, TA = -40°C to +85°C.) (Note 2) PARAMETER Input Leakage -2: VCC = 2.2V VCC Standby Current (Note 6) -33: VCC = 5.5V Trickle-Charger Resistor Register 10h = A5h, VCC = Typ, VBACKUP = 0V Trickle-Charger Resistor Register 10h = A6h, VCC = Typ, VBACKUP = 0V Trickle-Charger Resistor Register 10h = A7h, VCC = Typ, VBACKUP = 0V VBACKUP Leakage Current DC ELECTRICAL CHARACTERISTICS (VCC = 0V, TA = -40°C to +85°C.) (Note 2) PARAMETER VBACKUP Current EOSC = 0, SQW Off VBACKUP Current EOSC = 0, SQW On VBACKUP Current...

DS1339 I C Serial Real-Time Clock AC ELECTRICAL CHARACTERISTICS (VCC = MIN to MAX, TA = -40°C to +85°C.) (Note 9) PARAMETER CONDITION Fast mode SCL Clock Frequency Bus Free Time Between a STOP and START Condition Hold Time (Repeated) START Condition (Note 10) tBUF tHD:STA HIGH Period of SCL Clock Setup Time for a Repeated START Condition Data Hold Time (Notes 11, 12) Data Setup Time (Note 13) Rise Time of Both SDA and SCL Signals (Note 14) Fall Time of Both SDA and SCL Signals (Note 14) Setup Time for STOP Condition Standard mode Fast mode Standard mode Fast mode Standard mode Fast mode...

DS1339 I C Serial Real-Time Clock POWER-UP/DOWN CHARACTERISTICS (TA = -40°C to +85°C) (Note 2, Figure 1) PARAMETER VCC Fall Time; VPF(MAX) to VPF(MIN) VCC Rise Time; VPF(MIN) to VPF(MAX) WARNING: Under no circumstances are negative undershoots, of any amplitude, allowed when device is in battery-backup mode. Note 2: Limits at -40°C are guaranteed by design and are not production tested. ICCA—SCL at fSC max, VIL = 0.0V, VIH = VCC, trickle charger disabled. Specified with the I2C bus inactive, VIL = 0.0V, VIH = VCC, trickle charger disabled. VCC must be less than 3.63V if the 250Ω resistor is...

STOP START tHD:DAT tHIGH tSU:DAT Power Control ALARM, TRICKLE

DS1339 I C Serial Real-Time Clock TYPICAL OPERATING CHARACTERISTICS (VCC = 3.3v, TA = +25°C, unless otherwise noted.) IBACKUP vs. VBACKUP Oscillator Frequency vs. Supply Voltage Oscillator Supply Voltage (V)