The Maxim Integrated DS1391U-3+T is a high-precision, low-power real-time clock (RTC) with a built-in temperature-compensated crystal oscillator (TCXO) and crystal. This RTC is designed to provide accurate time and date information for a wide range of applications, including embedded systems, telecommunications, data loggers, and many other types of electronic equipment.

Key Features

• Accuracy: The device maintains an impressive timekeeping accuracy of ±5ppm (±0.432 second/day) over the temperature range of -40°C to +85°C, ensuring reliable performance under varying environmental conditions.
• Power Management: With a supply voltage range of 2.7V to 5.5V, the DS1391U-3+T is versatile for different power setups. Additionally, it features a backup battery input and automatic switch-over to the battery when main power is lost, preserving timekeeping operation.
• Communication Interface: The device uses an I²C serial interface for communication, allowing for easy integration into existing systems with minimal interface requirements.
• Memory: It includes a user-accessible, non-volatile, timekeeping RAM, which can be used for storage of application-specific data that needs to be preserved across power cycles.
• Form Factor: The RTC is offered in a compact, 10-pin µSOP package, making it suitable for space-constrained applications.
• Extended Temperature Range: The device operates reliably in extreme temperature environments, making it suitable for outdoor and industrial applications.

Applications

The DS1391U-3+T is ideal for a variety of applications where maintaining accurate time is crucial. These include:

• Networking equipment (routers, switches, servers)
• Industrial systems (PLCs, industrial computers)
• Consumer electronics (set-top boxes, digital recording devices)
• Portable medical devices
• Point-of-sale (POS) systems

With its combination of accuracy, power efficiency, and robust feature set, the Maxim Integrated DS1391U-3+T RTC is a highly reliable choice for time-critical applications demanding long-term, precise timekeeping.