The DS1225AD-170 is a 64k Nonvolatile SRAM from Dallas Semiconductor (now Maxim Integrated). This memory device combines the functionality of static RAM with non-volatile EEPROM technology, providing a reliable solution for storing critical data that must be retained even when power is lost.

Applications:

• Data logging: Used in systems where data needs to be continuously recorded and preserved, even during power outages.
• Industrial control systems: Employed in PLCs and other industrial controllers to store configuration parameters and operational data.
• Point-of-sale (POS) terminals: Provides non-volatile storage for transaction data and system settings.
• Networking equipment: Stores configuration data and routing tables in routers, switches, and other network devices.
• Medical devices: Used in medical instruments and equipment to store patient data and calibration settings.

Features:

• Non-volatile storage: Retains data without power using an embedded lithium battery.
• 64k (8k x 8) memory array: Provides ample storage for various data types.
• JEDEC standard pinout: Simplifies integration into existing systems.
• Automatic power-fail detect and switch circuitry: Ensures seamless transition to battery backup during power loss.
• Write protection: Prevents accidental data corruption during power transitions.
• Unlimited write cycles: Unlike EEPROMs, this device allows for virtually unlimited write operations.
• 10-year data retention in the absence of power.
• 170ns access time.

Benefits:

• Data security: Protects critical data from loss due to power failures.
• Increased system reliability: Reduces downtime and data corruption in mission-critical applications.
• Simplified design: Integrates easily into existing systems with a standard pinout.
• Reduced maintenance: Eliminates the need for frequent battery replacements (battery life is typically 10+ years).
• Enhanced system performance: Fast access times ensure quick data retrieval.

Additional Details:

The DS1225AD-170 operates within a specific voltage range (typically 4.5V to 5.5V) and temperature range (typically 0°C to 70°C or -40°C to +85°C, depending on the specific grade). The device utilizes a CMOS SRAM core with a non-volatile element overlayed. During normal operation, it functions as a standard SRAM. When a power failure is detected, the device automatically switches to battery backup mode, preserving the data stored in memory. The device also includes write protection circuitry to prevent accidental data corruption during power transitions. It is packaged in a 28-pin DIP package.