The DS1250Y is a nonvolatile timekeeping RAM manufactured by Dallas Semiconductor (now part of Maxim Integrated). It integrates static RAM, a real-time clock, and a lithium battery to provide a complete timekeeping solution that retains data and time even when the main power is off.

Applications:

• Data Logging: Used in systems that require continuous data recording with accurate time stamps.
• Industrial Control Systems: Implemented in industrial automation equipment to track time and maintain critical data during power interruptions.
• Point-of-Sale (POS) Terminals: Used in POS systems to maintain transaction records and time-sensitive data.
• Medical Equipment: Employed in medical devices to ensure accurate timekeeping and data retention for patient records.
• Embedded Systems: Integrated into various embedded systems to provide nonvolatile memory and real-time clock functionality.

Features:

• Nonvolatile Timekeeping RAM: Combines static RAM with a real-time clock and battery backup.
• Real-Time Clock (RTC): Provides accurate timekeeping with year, month, day, hour, minute, and second information.
• Integrated Lithium Battery: Maintains data and time for over 10 years in the absence of external power.
• Automatic Power-Fail Detect and Switch Circuitry: Automatically switches to battery power when the main power fails.
• Standard JEDEC Byte-Wide Pinout: Compatible with standard memory sockets for easy integration.
• Operating Temperature Range: Typically operates over a wide temperature range for industrial applications.

Benefits:

• Data Retention: Ensures critical data is preserved during power outages, preventing data loss.
• Accurate Timekeeping: Provides precise timekeeping for accurate time-stamping and scheduling.
• Long-Term Reliability: Integrated battery provides long-term data retention and reliable operation.
• Ease of Integration: Standard pinout allows for easy integration into existing systems.
• Maintenance-Free Operation: Requires no external components or maintenance for timekeeping and data retention.

Additional Details:

The DS1250Y typically features a 128k x 8 or 32k x 8 static RAM configuration. The RTC provides time information in BCD format. The battery voltage is typically 3V. The device operates over a temperature range of -40°C to +85°C. It is commonly available in a 28-pin DIP package. Given its End-of-Life status, consider newer alternatives for new designs. Consult the manufacturer's datasheet for specific details and replacement options.