DS1307CDRG

The DS1307 is a low-power, full BCD clock/calendar circuit with 56 bytes of user NV SRAM. Address and data are transferred serially via the I2C bus. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The end of month date is automatically adjusted for months with fewer than 31 days, including leap-year correction. The clock can operate in either 24-hour or 12-hour format with an AM/PM indicator. The DS1307 features a built-in power-sense circuit that detects power failures and automatically switches to the backup supply (battery) when a power failure is detected.

Applications

• Prepayment energy meters, IC card water meters, IC card gas meters
• Mobile phones
• Portable instruments
• Fax machines
• Battery-powered products
• Televisions

Key features

• Based on 32.768 kHz quartz crystal; counts seconds, minutes, hours, days, months, day-of-week, and years with leap-year compensation
• 56-byte non-volatile RAM with backup battery
• I2C serial bus interface
• Programmable square-wave output
• Automatic power-fail detection and power-switching circuit
• Battery backup current less than 500nA with oscillator running
• Optional industrial temperature range: -40°C ~ +85°C
• Available packages: DIP-8, SOP-8, and MSOP-8