Nonvolatile Controller X 16 Chip

This product is Not Recommended for New Designs. Some versions may be No Longer Available or being discontinued and subject to Last Time Buy, after which new orders can not be placed.

The DS1212 Nonvolatile Controller x16 Chip performs five circuit functions required to render standard CMOS RAM nonvolatile:

• Monitor V_cc 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 V_cc, 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 V_cco, 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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