Maxim Integrated DS1391U-33 Low-Voltage SPI/3-Wire RTCs

The DS1391U-33 is a high-precision, low-voltage real-time clock (RTC) from Maxim Integrated that offers a comprehensive timekeeping solution for a wide range of applications. This integrated circuit is engineered to maintain accurate time and date information, featuring a serial peripheral interface (SPI) and 3-wire interface for seamless integration with microcontrollers and other digital systems.

Designed with versatility in mind, the DS1391U-33 operates over the industrial temperature range and is housed in a compact, 8-pin µSOP package, making it an ideal choice for space-constrained applications. Its low-power consumption ensures minimal impact on system power budgets, which is critical for battery-powered and portable devices.

Key features of the DS1391U-33 include:

• Integrated Timekeeping Functions: The device includes a full calendar, accurate to the year 2100, with seconds, minutes, hours, day, date, month, and year information. It also provides clock output signals for peripheral devices.
• Dual Power Supplies: The RTC operates on a primary power supply while a secondary backup power input ensures timekeeping continuity during primary power loss, making it extremely reliable for mission-critical systems.
• Programmable Alarm and Timer Functions: These features allow users to set interrupts for specific time events, adding to the device's flexibility and utility in complex systems.
• Low Voltage Operation: The DS1391U-33 is designed to work at a nominal voltage of 3.3V, accommodating modern low-voltage systems.
• Trickle-Charge Capability: This feature enables the RTC to maintain the charge of a backup battery, ensuring long-term reliability of the timekeeping function.

Whether it's for data logging, industrial controllers, telemetry systems, or consumer electronics, the DS1391U-33 delivers precision and reliability. Its ease of integration, coupled with Maxim Integrated's reputation for quality, makes this RTC an excellent choice for designers looking to add robust timekeeping features to their products.

Maxim Integrated's commitment to innovation is reflected in the DS1391U-33's design, ensuring that your applications stay accurate and synchronized with real-world time, no matter the environment or application.