DS1210

Controllers Overview

The DS1210 is a nonvolatile controller chip designed to convert standard CMOS RAM into nonvolatile memory. It operates with a supply voltage range of 4.75V to 5.5V and consumes less than 100nA in battery mode. The device features an optional industrial temperature range of -40°C to +85°C for the N suffix variants. Available in space-saving 8-pin PDIP or 16-pin SO packages, it provides precise voltage detection and automatic switching between incoming power and backup batteries.

Controllers Feature Summary

• Converts CMOS RAM into nonvolatile memory by monitoring incoming power and automatically switching to battery backup during power failures.
• Unconditionally write protects memory when VCC is out-of-tolerance by inhibiting the chip enable output.
• Tests battery condition on power-up to prevent data loss if battery voltage falls below 2.0 volts.
• Supports redundant batteries via internal isolation switches that select the highest voltage source transparently.

Controllers Applications

• Microprocessor-based systems requiring data retention during power interruptions
• Battery-backed real-time clock applications
• Industrial control systems needing reliable nonvolatile storage

Controllers Procurement Notes

Verify the specific package type (PDIP or SO) and temperature grade (Commercial or Industrial) required for your design. Confirm RoHS compliance status as indicated by the '+' suffix. Check current availability as this component may be subject to discontinuation notices from Analog Devices/Maxim Integrated.

Controllers Selection Notes

Select the appropriate package based on board space constraints; use 8-pin PDIP for minimal footprint or 16-pin SO for surface mount flexibility. Choose the 'N' suffix variant if operation in temperatures down to -40°C is necessary. Ensure the TOL pin configuration matches the desired power-fail detection threshold for your specific supply voltage requirements.

Controllers Part Context

The DS1210 belongs to the Maxim Integrated family of nonvolatile controllers. It is specifically engineered to interface with external CMOS SRAM devices. Unlike standalone NVRAM chips, this controller manages the power switching and protection logic, allowing designers to utilize standard RAM components while achieving nonvolatile characteristics.

Controllers Replacement Considerations

DS1210SN+

Controllers FAQ

How does the DS1210 handle battery redundancy?

The DS1210 includes an internal isolation switch that allows two batteries to be connected. It automatically selects the battery with the higher voltage. If one battery fails, the other takes over without interrupting circuit operation.

What happens if the battery voltage drops below 2.0 volts?

During power-up, the DS1210 checks the battery voltage. If it is below 2.0 volts, the second memory cycle is inhibited to prevent data corruption. A subsequent read/write test can verify if the battery is low.