Rx5C348A/B are CMOS real-time clock ICs connected to the CPU by four signal lines, CE, SCLK, SI, SO, and configured to perform serial transmission of time and calendar data to the CPU.
This document is a technical datasheet for the Ricoh Rx5C348A/B series of CMOS real-time clock integrated circuits. These devices are designed to connect to a CPU via four signal lines (CE, SCLK, SI, SO) to perform serial transmission of time and calendar data.
| Timekeeping supply voltage range | 1.45 to 5.5V |
|---|---|
| Typical time keeping current (Rx5C348A) | 0.35uA at 3V |
| Typical time keeping current (Rx5C348B) | 0.55uA at 3V |
| Maximum clock frequency | 2 MHz (with VDD = 5V) |
| Oscillation Frequency | 32.768 kHz |
The Rx5C348A can disable 32-kHz clock output via command, while the Rx5C348B keeps it enabled.
The models come in SSOP10, SSOP10G, and TSSOP10G packages.