The R×5C338A is a 3-wire serial interface real-time clock IC with voltage monitoring function. It is connected to the CPU through three signal lines and performs serial transmission of time and calendar data. It incorporates a periodic interrupt circuit, two alarm circuits, an oscillation circuit, an oscillation halt sensing circuit, a supply voltage monitoring circuit, a 32-kHz clock output function, and an oscillation adjustment circuit.
The Ricoh Rx5C338A is a CMOS real-time clock IC designed for serial transmission of time and calendar data to a CPU using only three signal lines: CE, SCLK, and SIO. It incorporates various functional circuits including a periodic interrupt generator, two alarm circuits, and a supply voltage monitoring system to ensure data validity and system reliability.
The device supports timekeeping and calendar functions with automatic leap year identification up to the year 2099. It features a high-precision oscillation adjustment circuit and a built-in 32-kHz clock output. The IC is available in ultra-compact 10-pin SSOP and SSOP-G packages and is suitable for applications in communication devices, computers, and home appliances.
| Supply Voltage Range | 1.45 to 5.5 volts |
|---|---|
| Supply Current (Typical) | 0.35pA at 3 volts |
| Maximum Clock Frequency | 2 MHz |
| Oscillation Frequency | 32.768 kHz |
| Operating Temperature | -40 to +85 °C |
The maximum clock frequency is 2 MHz when the supply voltage is 5 volts.
Yes, it automatically identifies leap years up to the year 2099.
The IC connects to the CPU using three signal lines: CE (Chip Enable), SCLK (Serial Clock), and SIO (Serial Input/Output).