Maxim Integrated DS1744-70+ Nonvolatile Timekeeping RAM

The DS1744-70+ from Maxim Integrated is a high-performance, full-function, year-2000-compliant (Y2K-compliant) timekeeping RAM that combines a full-featured real-time clock/calendar (RTC) and a static RAM with a nonvolatile controller circuit. This innovative product is designed for applications that require long-term data retention and timekeeping, such as embedded systems, utility meters, and industrial controllers.

With a capacity of 32KB, the DS1744-70+ provides ample storage for critical data, which is maintained in the absence of an external power supply by an onboard lithium energy source. The RTC tracks time with precision in seconds, minutes, hours, day, date, month, and year format, with the accuracy necessary for time-critical applications. The calendar is accurate through 2100, with automatic leap year correction, ensuring reliable operation well into the future.

One of the key features of the DS1744-70+ is its ability to automatically switch over to battery backup in the event of a power failure. This seamless transition ensures that both the clock and RAM contents are preserved. Additionally, the device features a write protection mechanism that prevents inadvertent writes to the clock or RAM data when the power level drops below a predefined threshold, further securing the integrity of the data.

Communication with the DS1744-70+ is facilitated via a simple multiplexed address and data bus, which allows for easy integration into a wide range of microprocessor-based systems. The device is packaged in a standard 28-pin 600-mil EDIP or 300-mil SO package, making it compatible with existing board layouts and designs.

For those looking to incorporate reliable timekeeping and data storage into their systems, the DS1744-70+ offers a robust solution that delivers both performance and peace of mind. Its combination of nonvolatile RAM and RTC functionality, along with the assurance of Y2K compliance, makes it an excellent choice for a multitude of applications requiring dependable long-term operation.