Maxim Integrated DS1643-70 Nonvolatile Timekeeping RAM

The Maxim Integrated DS1643-70 is a state-of-the-art nonvolatile timekeeping RAM module that combines a full-featured, battery-backed real-time clock (RTC) with a 32K x 8 nonvolatile static RAM. Designed to be a complete solution for data and timekeeping needs, this hybrid device ensures that both time and user data are maintained in the absence of an external power supply.

The DS1643-70 features a built-in lithium energy source and a quartz crystal, which are both encapsulated within the module to provide a high level of integration and long-term reliability. The RTC provides information including seconds, minutes, hours, day, date, month, and year, and it automatically corrects for months with fewer than 31 days, including corrections for leap year. The clock operates in either 24-hour or 12-hour format with an AM/PM indicator.

Integration of the memory and timekeeping functions allows the DS1643-70 to power down the SRAM and maintain data integrity while running the clock on the backup energy source. This feature is particularly valuable in systems where memory data and real-time clock must be preserved without the need for an external battery. The nonvolatile feature of the SRAM is transparent to the user, with no special write sequences required to make data nonvolatile.

The DS1643-70 is designed with a standard JEDEC 28-pin 600-mil DIP package, making it easy to integrate into a variety of applications. The device is ideal for use in systems that require reliable timekeeping and data storage upon power loss, such as embedded systems, utility meters, point of sale terminals, and industrial controllers.

Key features of the DS1643-70 include a precision RTC with an accuracy of ±1 minute per month at 25°C, a programmable interrupt function, and a low-power consumption design that ensures a long battery life. With its robust design and reliable performance, the Maxim Integrated DS1643-70 is the perfect solution for maintaining critical data and time information in a wide range of applications.