MSKSEMI DS1307Z+MSK

This serial real-time clock is a low-power, full BCD clock/calendar chip with 56 bytes of non-volatile SRAM. Address and data are transferred serially via a two-wire bidirectional bus. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. End-of-month date is 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. An integrated power-sense circuit detects power failure and automatically switches to battery backup.

• Real-time clock counts seconds, minutes, hours, date, month, day of week, and year, with leap year compensation valid up to 2100
• 56-byte non-volatile RAM for data storage
• 2-wire serial interface
• Programmable square-wave output signal
• Automatic power-fail detect and switch circuit
• Consumes less than 1μA in battery backup mode with oscillator running
• Optional industrial temperature range: -40°C to +85°C