DS1211+

Controllers Overview

The DS1211+ is a nonvolatile memory controller designed to convert full CMOS RAMs into nonvolatile memories. It operates with a supply voltage range of 4.75V to 5.25V and consumes less than 100 nA of battery current. The device supports up to eight CMOS RAM channels via a 3-to-8 decoder. It features automatic switching to battery backup upon power failure and includes unconditionally write protection when VCC is out of tolerance. The component is available in a 20-pin DIP package.

Controllers Feature Summary

• Converts full CMOS RAMs into nonvolatile memories by monitoring incoming power for out-of-tolerance conditions
• Automatically switches to battery backup and inhibits chip enables to provide unconditional write protection during power failures
• Utilizes a low-leakage CMOS process to achieve precise voltage detection while consuming extremely low battery current
• Includes circuitry to test battery condition on power-up and provides support for redundant batteries

Controllers Applications

• Systems requiring nonvolatile operation for multiple CMOS memories using lithium batteries
• Applications needing automatic power-fail detection and processor interrupt signals
• Circuits requiring unconditionally write protected memory states during power loss

Controllers Procurement Notes

Verify the specific package variant, as the DS1211 series includes both through-hole DIP and surface-mount SOIC options. Confirm temperature range requirements against the standard commercial grade or industrial grade specifications. Check manufacturer documentation for RoHS compliance details and current product lifecycle status, as availability may vary.

Controllers Selection Notes

Select this controller when designing systems that require managing up to eight separate CMOS RAM chips with a single control interface. Ensure the design accommodates the required 3-to-8 address decoding logic. Verify that the external lithium battery selection aligns with the device's low standby current requirements and voltage thresholds.

Controllers Part Context

The DS1211 belongs to the Maxim Integrated nonvolatile controller family, which addresses data retention issues in volatile memory systems. It functions alongside companion devices like the DS1212, which offers similar control for sixteen chips. This component integrates power monitoring, battery management, and memory addressing into a single CMOS circuit.

Controllers Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material.