R2221T/L R2223T/L 2-wire Serial Interface Real Time Clock IC is a CMOS real-time clock IC connected to the CPU by two signal lines, SCL, SDA, and configured to perform serial transmission of time and calendar data to the CPU.
The document describes the R2221T/L and R2223T/L series of CMOS real-time clock integrated circuits. These devices connect to a CPU via two signal lines (SCL and SDA) to perform serial transmission of time and calendar data. Key features include periodic interrupt generation with six selectable ranges, dual alarm interrupt circuits, and an oscillation circuit driven under constant voltage for low power consumption.
| Timekeeping Supply Voltage (Min) | 0.6V to 5.5V |
|---|---|
| Typical Power Consumption | 0.18uA at 3V |
| Oscillation Frequency | 32.768 kHz |
| Operating Temperature Range | -40 to +85 °C |
| Package Type (T) | TSSOP10G |
| Max SCL Clock Frequency | 400 kHz |
The time keeping current is typically 0.18uA at a supply voltage of 3V.
Yes, it supports automatic identification of leap years up to the year 2099.