DS1210S

Overview

The DS1210S+ is a nonvolatile controller chip designed to convert standard CMOS RAM into nonvolatile memory. It operates within a supply voltage range of 4.75V to 5.5V and consumes 5mA of operating current. The device features an ultra-low battery backup current of less than 100nA and supports redundant batteries for enhanced reliability. It is housed in a 16-pin SO package and functions within a commercial temperature range of 0°C to +70°C.

Feature Summary

• Converts CMOS RAM into nonvolatile memory by monitoring incoming power and automatically switching to battery backup during power failures.
• Unconditionally write-protects the connected memory when the supply voltage falls out of tolerance, preventing data corruption.
• Supports redundant battery configurations with internal isolation switches to ensure continuous operation if one battery fails.
• Tests battery condition upon power-up to provide early warnings of potential data loss due to low battery voltage.

Applications

• Microprocessor-based systems requiring persistent data storage
• Battery-backed real-time clock circuits
• Industrial control systems needing reliable nonvolatile memory solutions

Procurement Notes

Verify component authenticity through authorized Analog Devices or Maxim Integrated distributors. Confirm RoHS compliance status via official datasheets. Check for obsolescence notices as this series may be discontinued. Ensure proper handling for static-sensitive components during installation.

Selection Notes

Select the DS1210S+ variant for surface-mount applications requiring a 16-pin SO package. Choose the industrial grade (DS1210SN+) if operation below 0°C is required. Verify that the connected CMOS RAM matches the electrical specifications supported by the controller's output drive capabilities.

Part Context

The DS1210 belongs to the Maxim Integrated family of nonvolatile memory controllers. These devices are engineered to simplify the integration of volatile SRAM with battery backup systems. The product line provides robust protection against power interruptions, ensuring data integrity in critical embedded applications.

Replacement Considerations

Consult official documentation for direct pin-compatible substitutes. Cross-reference with other models in the DS1210 series based on package type and temperature rating requirements.

FAQ

How does the DS1210S+ handle battery redundancy?

The controller includes an internal isolation switch that connects two batteries. It automatically selects the battery with the highest voltage and seamlessly transitions to the second battery if the primary one fails.

What is the mechanism for write protection?

When the supply voltage drops out of tolerance, the device inhibits the Chip Enable output (CEO). This holds the memory in a high-impedance state, preventing any writes until normal power is restored.