R2061 SERIES 3 wire interface Real-Time Clock ICs with Battery Backup switch-over Function
The Ricoh R2061 series consists of CMOS real-time clock ICs connected to a CPU via three signal lines: CE, SCLK, and SIO. These devices are designed for serial transmission of time and calendar data and include a battery backup switchover circuit to maintain timekeeping during power failures. The ICs feature a voltage detector and periodic interrupt circuits with selectable ranges from 0.5 seconds to 1 month.
| Timekeeping supply voltage (Typ.) | 0.75V |
|---|---|
| Time keeping current (Typ.) | 0.4uA |
| Time keeping current (Max.) | 1.0uA |
| Maximum clock frequency | 1MHz |
| Oscillation Frequency | 32.768 kHz |
| Operating Temperature | -40 to +85 °C |
| Storage Temperature | -55 to +125 °C |
The minimum timekeeping supply voltage is typically 0.75V and can be up to 1.00V.
The typical time keeping current is 0.4uA at 3V.
The maximum clock frequency is 1MHz when Vcc is 3V.