Description
The PT7C4300 serial real-time clock is a low-power clock/calendar with a programmable square-wave output. Address and data are transferred serially via a 2-wire bidirectional bus. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in the 24-hour format indicator.

FEATUREs
• Using external 32.768kHz quartz crystal
• Supports I2C-Bus's high speed mode (400 kHz)
• Includes time (Hour/Minute/Second) and calendar(Year/Month/Date/Day) counter functions (BCD code)
• Automatic power-fail detect and switch circuitry of battery backup
• Operating range: 2.0V to 5.5V
• Software clock calibration
• Ultra-low battery supply current of 1µA