XL1307

The XL/XD1307 series real-time clock is a low-power, full BCD clock/calendar with 56 bytes of non-volatile SRAM. Address and data are transferred serially via the I²C bidirectional bus. The clock/calendar provides seconds, minutes, hours, day of week, date, month, and year information. End-of-month dates are automatically adjusted for months with fewer than 31 days, including leap year correction. The clock operates in either 24-hour or 12-hour format with AM/PM indication. The XL/XD1307 features an integrated power-sense circuit that detects power failures and automatically switches to the backup supply. Timekeeping operation continues while the device is powered by the backup supply.

Key features

• Real-time clock with seconds, minutes, hours, day, date, month, and year counting; leap year compensation valid through 2100
• 56-byte battery-backed general-purpose RAM with unlimited write cycles
• I²C serial interface
• Programmable square-wave output signal
• Automatic power-fail detection and switchover circuit
• Power consumption below 1μA with oscillator running in battery backup mode
• Industrial temperature range: -40°C to +85°C
• Supply voltage range: 4.5V ~ 5.0V
• Available in 8-pin plastic DIP or small outline package