Maxim Integrated DS1339U-3+ Real-Time Clock

The DS1339U-3+ from Maxim Integrated is a highly accurate, low-power, serial real-time clock (RTC) with a built-in 56-byte, battery-backed SRAM. Offering full binary-coded decimal (BCD) clock/calendar functionality, this RTC is designed to provide precise timekeeping and data storage in a variety of applications, from embedded systems to industrial controls and portable consumer electronics.

This compact RTC integrates a crystal oscillator and leverages a 2-wire serial interface compatible with I²C for communication, simplifying integration into existing designs. The device supports a wide voltage range of 2.3V to 5.5V, making it flexible for various power supply scenarios and ensuring reliable operation even during voltage fluctuations.

One of the standout features of the DS1339U-3+ is its automatic power-fail detect and switch circuitry. This ensures that timekeeping continues uninterrupted by automatically switching to the backup power supply when the main power is compromised. The low power consumption of the device, coupled with a long-life backup battery, ensures that the clock/calendar information is maintained for extended periods without external power.

The DS1339U-3+ provides a multitude of useful features, including two programmable time-of-day alarms and a programmable square-wave output. These functions allow for the scheduling of events and tasks without the need for additional timing components, thus reducing the overall system complexity and cost. The clock/calendar itself provides seconds, minutes, hours, day, date, month, and year information, with automatic leap year compensation valid up to the year 2100.

Encased in an 8-pin µSOP package, the DS1339U-3+ is designed for space-constrained applications. Its surface-mount form factor is ideal for automated production environments, and the device's industrial temperature range of -40°C to +85°C ensures reliable operation in harsh conditions.

Overall, the DS1339U-3+ from Maxim Integrated is a versatile and dependable choice for any application requiring precise timekeeping and data retention capabilities, delivering performance and reliability in a tiny footprint.