The DS17287 is a real-time clock (RTC) with a built-in crystal and battery, manufactured by Dallas Semiconductor (now Maxim Integrated). It's designed to provide accurate timekeeping even when the main system power is off.

Applications

• Personal computers (PCs)
• Servers
• Embedded systems
• Industrial control systems
• Data logging applications

Features

• Integrated Crystal: Contains a built-in 32.768 kHz crystal oscillator for accurate timekeeping.
• Integrated Battery: Includes a lithium battery to maintain timekeeping when external power is unavailable.
• Real-Time Clock: Tracks seconds, minutes, hours, day, date, month, and year with leap year compensation.
• Programmable Alarm: Provides a programmable alarm function to trigger events at specific times.
• RAM: Incorporates a small amount of static RAM (SRAM) for storing system configuration data.

Benefits

• Accurate Timekeeping: Ensures accurate time and date information is maintained.
• Data Retention: The integrated battery allows the RTC to continue running and retain the time and date even during power outages.
• Simplified Design: Simplifies system design by integrating the crystal and battery into a single package.
• Programmable Alarms: Enables the system to perform actions based on specific time triggers.
• Non-Volatile Memory: SRAM provides a convenient way to store small amounts of configuration data that needs to be retained without power.

Additional Details

The DS17287 communicates with the host system using a parallel interface. The battery life is typically several years. Because the battery is integrated into the chip, the entire chip needs to be replaced when the battery is depleted. Consult the official datasheet from Maxim Integrated for detailed specifications, pinouts, and operating conditions. As an older component, availability and suitability for new designs should be carefully considered.