DS1210N+

Overview

The DS1210N+ 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 supports an industrial temperature range from -40°C to +85°C. The device consumes less than 100nA in battery mode and features automatic power-fail detection with write protection. It includes battery status monitoring, redundant battery support, and low forward voltage drop switching.

Feature Summary

• Converts CMOS RAM into nonvolatile memory by managing power sources
• Unconditionally write protects data when supply voltage is out-of-tolerance
• Automatically switches to battery backup during power failure events
• Tests battery condition on power-up to prevent data loss

Applications

• Microprocessor-based systems requiring data retention
• Battery-backed real-time clock circuits
• Industrial control systems needing reliable storage
• Embedded applications with strict power management requirements

Procurement Notes

Verify the specific suffix 'N' confirms the industrial temperature grade (-40°C to +85°C) rather than commercial grade. Confirm RoHS compliance status via official documentation as manufacturing practices may evolve. Check current lifecycle status as older Maxim products often face discontinuation or obsolescence notices.

Selection Notes

Select this component when integrating external SRAM requires nonvolatile behavior without complex software overhead. Ensure the application benefits from hardware-level write protection and automatic battery switchover. Consider package availability if space constraints favor the 8-pin PDIP form factor over other options.

Part Context

This part belongs to the DS1210 family of nonvolatile controllers from Analog Devices/Maxim Integrated. It complements other RTC and memory solutions by providing the necessary interface logic for battery-backed RAM. The N suffix specifically denotes the extended temperature variant suitable for harsher environments compared to standard commercial parts.

Replacement Considerations

DS1210S+ (SOIC-16 package)

FAQ

How does the DS1210N+ protect data during a power failure?

It monitors the incoming supply voltage and inhibits the Chip Enable output (CEO) when voltage drops out-of-tolerance, effectively preventing writes while simultaneously switching to battery power.

What is the purpose of the TOL pin?

The TOL pin allows adjustment of the power-fail detection threshold. Grounding it sets the trip point between 4.5V and 4.75V, while connecting it to VCCO lowers the range to 4.25V–4.5V.

Can the DS1210N+ support multiple batteries?

Yes, it provides for redundant batteries by allowing connections to both VBAT1 and VBAT2 pins, automatically selecting the battery with the higher voltage.