The DS1643-85+ is a state-of-the-art nonvolatile timekeeping RAM module from Maxim Integrated, designed to provide a full-featured battery-backed real-time clock (RTC) and memory component in a single package. This innovative product combines 32k x 8 nonvolatile static RAM, a real-time clock, a crystal, and a lithium energy source into a 34-pin DIP package, ensuring long-term data retention and accurate timekeeping even when the main power is off.

Key Features

• Integrated Power-Supply: With a built-in lithium energy source, the DS1643-85+ ensures up to 10 years of data retention and clock functionality in the absence of external power.
• Real-Time Clock: The device includes a full-function, binary-coded decimal (BCD) clock/calendar that is accessible through a simple multiplexed byte-wide interface. Timekeeping is maintained down to the second, minute, hour, day, date, month, and year with leap year compensation up to the year 2100.
• Automatic Power-Fail Chip De-Select: When power conditions decline below a certain threshold, the device automatically switches to the battery supply, ensuring no data loss or corruption.
• Byte-Wide Interface: The DS1643-85+ allows easy integration into a wide range of applications thanks to its byte-wide interface, which is compatible with most microprocessors and microcontrollers.
• Low Energy Consumption: Designed with energy efficiency in mind, the DS1643-85+ features a low power standby mode, making it ideal for battery-powered applications.

Applications

The DS1643-85+ is perfect for applications that require reliable and long-term nonvolatile memory storage with an integrated real-time clock. It is commonly used in systems that need to maintain accurate time and date even after power cycles, such as:

• Embedded systems
• Utility meters
• Industrial timekeeping
• POS terminals
• Network hardware (routers, switches, servers)
• Medical devices

With its robust feature set and Maxim Integrated's reputation for quality, the DS1643-85+ is an excellent choice for designers looking to enhance their systems with reliable timekeeping and memory capabilities.