This datasheet details the Maxim DS1302, a real-time clock chip with 31 bytes of static RAM and a serial interface for battery-backed timekeeping.
The DS1302 is a trickle-charge timekeeping chip that integrates a real-time clock/calendar and 31 bytes of static RAM. It communicates via a simple three-wire serial interface (CE, I/O, SCLK) with a microprocessor. The device supports both 12-hour and 24-hour time formats and includes leap-year compensation for dates up to the year 2000.
| Supply Voltage Range | 2.0V to 5.5V |
|---|---|
| Quiescent Current (at 2.0V) | < 300nA |
| RAM Size | 31 x 8 bits |
| Nominal Frequency | 32.768 kHz |
| Load Capacitance | 6 pF |
The device supports timekeeping with leap-year compensation valid up to the year 2100.
The device uses a simple three-wire serial interface consisting of CE, I/O, and SCLK.
Pin 2 (X1) connects to a standard 32.768kHz quartz crystal or an external oscillator signal.