Nonvolatile Controller X 16 Chip

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Part Details
  • Controller circuitry with monitoring and logic functions to make CMOS RAM nonvolatile
  • Controls up to 16 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:
    • DS1212: 0°C to +70°C
    • DS1212-IND: -40° to +85°C
  • Voltage/power-fail tolerances: 5V ±5% or ±10%
Additional Details
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The DS1212 Nonvolatile Controller x16 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 4.5V to 4.25V. By combining the DS1212 nonvolatile controller/decoder chip with lithium batteries, nonvolatile RAM operation can be achieved for up to 16 CMOS memories.

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