DS1744-120 Nonvolatile Timekeeping RAM

The DS1744-120 is a full-featured, battery-backed nonvolatile timekeeping RAM module from Maxim Integrated. This product combines a versatile 32K x 8 nonvolatile static RAM, a real-time clock, a crystal, and a lithium battery all in a single power encapsulated module. The integration of these components into one package makes the DS1744-120 a compact and reliable solution for memory and timekeeping functions in a wide range of applications.

The nonvolatile RAM in the DS1744-120 is directly accessible in a byte-wide configuration and retains data without the need for an external battery. This feature ensures that critical data is preserved in the event of a power failure. The real-time clock provides timekeeping with year, month, day, date, hours, minutes, and seconds information. The clock is accurate to ±1 minute per month at 25°C, making it suitable for applications that require precise time tracking.

Key features of the DS1744-120 include:

• Integrated Power-Fail Write Protection: Automatically switches to the backup battery when main power is lost, ensuring data integrity during power transitions.
• Low Energy Consumption: Designed for low power operation, which extends the life of the on-board battery and reduces the overall power requirements of the system.
• Century Byte: The real-time clock includes a century byte that provides full calendar capability from 1900 to 2099, accommodating leap years and the transition to the next century.
• Simple Parallel Interface: Enables easy integration with most microprocessors, providing a straightforward method to access both the RAM and timekeeping functions.
• Long Battery Life: The self-contained battery has a shelf life of 10 years, ensuring long-term reliability of the timekeeping and RAM retention functions.

The DS1744-120 is an excellent choice for systems that require a reliable nonvolatile memory and an integrated real-time clock. Its applications include utility meters, industrial controllers, point-of-sale terminals, and other embedded systems where maintaining accurate time and preserving data integrity are critical.

With its robust feature set and integrated design, the DS1744-120 from Maxim Integrated provides a comprehensive solution for designers looking to add nonvolatile RAM and real-time clock capabilities to their products with minimal additional components and complexity.