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Nonvolatile Controller X 8 Chip

Product Details

Key Features

Simplified Block Diagram

Technical Docs

Data Sheet Nonvolatile Controller X 8 Chip Nov 18, 1999

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Key Features

  • Controller circuitry with monitoring and logic functions to make CMOS RAM nonvolatile
  • Controls up to 8 memories
  • Monitors Vcc and write-protects when out of tolerance
  • Consumes less than 100nA battery current
  • Tests battery condition on power-up
  • Supports redundant batteries
  • Thermal operating ranges:
    • DS1211: 0°C to +70°C
    • DS1211-IND: -40° to +85°C
  • Voltage/tolerances: 5V ±5% or ±10%

Applications/Uses

Description

The DS1211 Nonvolatile Controller x8 Chip performs five circuit functions required to render standard CMOS RAM nonvolatile:

  • Monitor Vcc using a precise comparator that detects power-fail and inhibits chip-enable
  • Monitor battery status and warn the processor of low status
  • Switch power between a battery and Vcc, whichever is greater
  • Write-protect data
  • Provide for automatically switching between two batteries Power-fail detection occurs in the range of 4.75V to 4.5V with the tolerance Pin 3 grounded. If Pin 3 in connected to Vcco, then power-fail detection occurs in the range of 4.5 volts to 4.25 volts.

    By combining the DS1211 nonvolatile controller/decoder chip and lithium batteries, nonvolatile RAM operation can be achieved for up to eight CMOS memories.
  • Simplified Block Diagram

    DS1211: Pin Assignment DS1211: Pin Assignment Zoom icon

    Technical Docs

    Data Sheet Nonvolatile Controller X 8 Chip Nov 18, 1999

    Support & Training

    Search our knowledge base for answers to your technical questions.

    Filtered Search

    Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .