DS1307-DW

The DS1307 serial real-time clock is a low-power, BCD clock/calendar chip with 56 bytes of non-volatile SRAM. Address and data are transferred serially via the I²C interface. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. End-of-month dates are automatically adjusted for months with fewer than 31 days, with leap year correction included. The clock format supports either 24-hour or 12-hour mode with AM/PM indication. The DS1307 features an integrated power-sense circuit that automatically switches to backup power supply when primary power fails, maintaining timekeeping operation.

Applications

• Multi-rate energy meter
• IC card water meter
• IC card gas meter
• Mobile phone
• Portable instrument
• Fax machine
• Battery-powered product
• Television

Key features

• Based on 32.768 kHz quartz crystal; counts seconds, minutes, hours, days, months, day of week, and years with leap-year compensation
• I²C serial bus interface
• Integrated 56-byte non-volatile RAM with backup battery
• Programmable square-wave output
• Integrated automatic power-fail detection and power-switching circuit
• Supply current less than 500 nA with battery backup and oscillator running
• Commercial temperature range: -20℃ to +85℃
• Available in DIP8 and SOP8 packages