The DS1251Y-120 is a 3.3V 4096 x 8 Nonvolatile Timekeeping RAM produced by Maxim Integrated. It is designed to provide a full-featured, battery-backed real-time clock/calendar (RTC) and 512K of nonvolatile static RAM. This component is particularly suitable for applications requiring data and timekeeping to be preserved in the absence of an external power source.

Key Features

• Integrated Battery: The DS1251Y-120 comes with a built-in lithium battery, which ensures that time, date, and RAM data are maintained in the absence of external power.
• Real-Time Clock: The device includes a real-time clock/calendar that tracks time in seconds, minutes, hours, days, date, month, and year. The RTC is accurate to ±1 minute per month at 25°C.
• Automatic Power-Fail Chip Deactivation: When power conditions deteriorate, the device automatically switches to the battery supply, ensuring no disruption to the clock or data.
• Large NV SRAM Storage: With 512K of nonvolatile SRAM, the DS1251Y-120 provides ample storage for critical data that must be preserved during power loss.
• High-Speed Access: The component offers fast read and write access times of 120ns, enabling efficient data retrieval and storage.
• Durable: The expected battery life for data retention and timekeeping is over 10 years, making it a reliable choice for long-term applications.
• Surface-Mount Package: The DS1251Y-120 is available in an industry-standard 32-pin EDIP or 36-pin TSOP packaging, making it versatile for various PCB designs.

Applications

The DS1251Y-120 is ideal for a range of applications that require reliable, long-term data retention and an accurate timekeeping mechanism. These include utility meters, security systems, industrial controllers, point-of-sale terminals, and other embedded systems that need to maintain data integrity and timekeeping through power cycles.

Technical Specifications