DS1212 - Nonvolatile Controller x 16 Chip

A, B, C, D CE CE0 - CE15 GND VBAT1 VBAT2 TOL VCCI VCCO PF - Address Inputs - Chip Enable - Chip Enable Outputs - Ground - + Battery 1 - + Battery 2 - Power Supply Tolerance - +5V Supply - RAM Supply - Power Fail CE15 CE14 CE13 CE12 CE11 D C 5 6 7 8 9 10 11 CE0 CE1 CE2 CE3 CE4 CE5 CE6 28-Pin PL

• Converts full CMOS RAM into nonvolatile memory Unconditionally write protects when VCC is out of tolerance Automatically switches to battery when power-fail occurs 4 to 16 decoder provides control for up to 16 CMOS RAMs Consumes less than 100 nA of battery current Tests battery condition on power-up Provides for redundant batteries Power fail signal can be used to interrupt processor on power failure Optional 5% or 10% power-fail detection Optional 28-pin PLCC surface mount package Optional indu.