DS1307 2 64 x 8, Serial, I C Real-Time Clock GENERAL DESCRIPTION FEATURES The DS1307 serial real-time clock (RTC) is a l-ow Real-Time Clock (RTC) Counts Seconds, power, full binary-coded decimal (BCD) clock/calendar Minutes, Hours, Date of the Month, Month, Day of plus 56 bytes of NV SRAM. Address and data are the week, and Year with Leap-Year 2 transferred serially through an C,I bidirectional bus. Compensation Valid Up to 2100 The clock/calendar provides seconds, minutes, hours, 56-Byte, Battery-Backed, General-Purpose RAM day, date, month, and year information. The end of with Unlimited Writes 2 the month date is automatically adjusted for months I C Serial Interface with fewer than 31 days, including corrections for leap Programmable Square-Wave Output Signal year. The clock operates in either the 24-hour or 12- Automatic Power-Fail Detect and Switch Circuitry hour format with AM/PM indicator. The DS1307 has a Consumes Less than 500nA in Battery-Backup built-in power-sense circuit that detects power failures Mode with Oscillator Running and automatically switches to the backup supply. Optional Industrial Temperature Range: Timekeeping operation continues while the part -40C to +85C operates from the backup supply. Available in 8-Pin Plastic DIP or SO Underwriters Laboratories (UL) Recognized TYPICAL OPERATING CIRCUIT V CC PIN CONFIGURATIONS V CC TOP VIEW CRYSTAL X1 V X1 V CC CC V R R CC PU PU X2 SQW/OUT X2 SQW/OUT V SCL V SCL BAT BAT X1 X2 V CC SDA GND SDA GND SCL SQW/OUT SO (150 mils) PDIP (300 mils) CPU DS130 SDA V BAT GND R = t /C PU r b Functional Diagrams ORDERING INFORMATION PART TEMP RANGE VOLTAGE (V) PIN-PACKAGE TOP MARK* DS1307+ 0C to +70C 5.0 8 PDIP (300 mils) DS1307 DS1307N+ -40C to +85C 5.0 8 PDIP (300 mils) DS1307N DS1307Z+ 0C to +70C 5.0 8 SO (150 mils) DS1307 DS1307ZN+ -40C to +85C 5.0 8 SO (150 mils) DS1307N DS1307Z+T&R 0C to +70C 5.0 8 SO (150 mils) Tape and Reel DS1307 DS1307ZN+T&R -40C to +85C 5.0 8 SO (150 mils) Tape and Reel DS1307N +Denotes a lead-free/RoHS-compliant package. *A + anywhere on the top mark indicates a lead-free package. An N anywhere on the top mark indicates an industrial temperature range device. 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 at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com. REV: 100208 AVAILABLE2 DS1307 64 x 8, Serial, I C Real-Time Clock ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground ................................................................................ -0.5V to +7.0V Operating Temperature Range (Noncondensing) Commercial .......................................................................................................................... 0C to +70C Industrial ............................................................................................................................ -40C to +85C Storage Temperature Range ......................................................................................................... -55C to +125C Soldering Temperature (DIP, leads) .................................................................................... +260C for 10 seconds Soldering Temperature (surface mount)...Refer to the JPC/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 o tfhe specifications is not implied. Exposure to the absolute maximum rating conditions for extended periods may affect device reliability. RECOMMENDED DC OPERATING CONDITIONS (T = 0C to +70C, T = -40C to +85C.) (Notes 1, 2) A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V 4.5 5.0 5.5 V CC Logic 1 Input V 2.2 V + 0.3 V IH CC Logic 0 Input V -0.3 +0.8 V IL V Battery Voltage V 2.0 3 3.5 V BAT BAT DC ELECTRICAL CHARACTERISTICS (V = 4.5V to 5.5V T = 0C to +70C, T = -40C to +85C.) (Notes 1, 2) CC A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Leakage (SCL) I -1 1 LI A I/O Leakage (SDA, SQW/OUT) I -1 1 A LO Logic 0 Output (I = 5mA) V 0.4 V OL OL Active Supply Current I 1.5 mA CCA (f = 100kHz) SCL Standby Current I (Note 3) 200 CCS A V Leakage Current I 5 50 nA BAT BATLKG 1.216 x 1.25 x 1.284 x Power-Fail Voltage (V = 3.0V) V V BAT PF V V V BAT BAT BAT DC ELECTRICAL CHARACTERISTICS (V = 0V, V = 3.0V T = 0C to +70C, T = -40C to +85C.) (Notes 1, 2) CC BAT A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS V Current (OSC ON) BAT I 300 500 nA BAT1 SQW/OUT OFF V Current (OSC ON) BAT I 480 800 nA BAT2 SQW/OUT ON (32kHz) V Data-Retention Current BAT I 10 100 nA BATDR (Oscillator Off) WARNING: Negative undershoots below -0.3V while the part is in battery-backed mode may cause loss of data. 2 of 14