The DS1558D from Maxim Integrated is a comprehensive memory solution that integrates a full-function, year 2000-compliant (Y2K) real-time clock (RTC) with an embedded crystal, SRAM, and a power-fail control circuit. This product is designed to maintain accurate time and date information, as well as to preserve user data, making it an ideal choice for a wide range of applications, including telecommunications, networking, industrial systems, and any other systems that require a reliable time base and data storage upon power loss.

Key Features

• Real-Time Clock (RTC): The DS1558D features a highly accurate RTC that maintains seconds, minutes, hours, day, date, month, and year information, with automatic leap year compensation valid up to 2100.
• Embedded Crystal: The inclusion of an embedded crystal within the device package eliminates the need for an external crystal, reducing the overall component count and simplifying the design process.
• SRAM: The device includes static random-access memory (SRAM) for user data storage, which is protected from power loss by an automatic switchover to a backup battery source.
• Power-Fail Control: The integrated power-fail control circuit ensures that the RTC and SRAM contents are maintained during power outages, with the switchover threshold voltage being user-adjustable.
• Serial Interface: The DS1558D communicates with the host system via a simple serial interface, which minimizes the number of I/O lines required and simplifies integration into existing designs.

Applications

The DS1558D is suited for a variety of applications, particularly where timekeeping is critical and data integrity must be maintained in the event of a power failure. Some common applications include:

• Server Hardware and Network Infrastructure
• Industrial Control Systems
• Utility Meters
• POS Terminals
• Medical Devices

Summary

Maxim Integrated's DS1558D is a robust, integrated memory solution that provides a secure and reliable way to maintain time and preserve user data across power cycling events. Its integration of RTC, SRAM, and power-fail control features in a single package makes it a compact and efficient choice for designers looking to streamline their system architecture while ensuring data and timekeeping integrity.