The DS1340Z-3+T&R is an integrated circuit (IC) Real Time Clock (RTC) with a trickle charger from Analog Devices. It is an 8-pin device that provides a low-power, low-cost solution for applications where reliable timekeeping is a critical feature. The IC contains a Real Time Clock (RTC) with a battery-backed charge pump, a 13-bit binary counter, an algorithmically derived battery voltage monitor, and an optional trickle charger for top-off the supercapacitor. The battery-backed charge pump provides both instantaneous and highly accurate timekeeping, while the optional trickle charger allows for long life and reliability in battery-backed applications. The device features selectable clock sources, a programmable leap year clock, alarm, and advanced functions including supercapacitor, power out, and power fail detect. It also features software selectable SQW and low battery detect outputs, and I2C and SPI interface options.