DS1212+

Overview

The DS1212+ is a nonvolatile memory controller designed to convert up to sixteen CMOS RAMs into nonvolatile memories. It operates with a supply voltage range of 4.75V to 5.5V and consumes less than 100nA in battery backup mode. The device features a 4-to-16 decoder, automatic power-fail detection, and unconditionally write-protects when VCC is out of tolerance. It supports redundant batteries and tests battery condition on power-up.

Feature Summary

• Converts full CMOS RAM into nonvolatile memory
• Unconditionally write protects when VCC is out of tolerance
• Automatically switches to battery when power-fail occurs
• Tests battery condition on power-up

Applications

• Battery-backed memory systems
• Data storage requiring power-fail protection
• Embedded systems needing nonvolatile RAM conversion

Procurement Notes

Verify the component status as discontinued or obsolete through official manufacturer channels before procurement planning. Confirm package availability and lead times directly with authorized distributors. Ensure compatibility with existing system designs given potential lifecycle changes.

Selection Notes

Select this controller for applications requiring management of up to sixteen CMOS RAM banks. Consider the optional industrial temperature range and surface mount packages if required by environmental constraints. Verify battery redundancy needs and power-fail detection thresholds during design.

Part Context

The DS1212 belongs to the Maxim Integrated nonvolatile controller family. It addresses the specific need to maintain data integrity in volatile memory systems during power interruptions. The device integrates decoding, switching, and monitoring functions into a single CMOS circuit.

Replacement Considerations

Check for direct pin-compatible replacements within the DS121x series. Evaluate alternative nonvolatile controllers from Analog Devices that offer similar functionality and package options.

FAQ

How does the DS1212 handle power failure?

It monitors the VCCI supply and automatically switches to battery power while inhibiting chip enables to prevent data corruption.

Can the DS1212 support multiple batteries?

Yes, it provides an internal isolation switch allowing connection of two batteries for redundancy, selecting the one with the highest voltage.