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.
Key Features
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
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