RS5C348A-E2-FB [Nisshinbo]

The Rx5C348A/B are CMOS real-time clock ICs that connect to a CPU via a 4-wire serial interface (CE, SCLK, SI, SO). They feature time and calendar counters in BCD format, periodic interrupts (0.5 seconds to 1 month), two alarm interrupt circuits, and a 32.768kHz clock output. The oscillation circuit operates under constant voltage, resulting in low timekeeping current (TYP. 0.35µA at 3V for Rx5C348A, TYP. 0.55µA at 3V for Rx5C348B). Additional features include oscillation halt sensing, supply voltage monitoring, leap year identification up to 2099, selectable 12/24-hour mode, built-in oscillation stabilization capacitors, and high-precision oscillation adjustment. The devices come in ultra-compact packages including SSOP10, SSOP10G, and TSSOP10G.