View ds1211 datasheet:

DS1211 Nonvolatile Controller x 8 Chip www.dalsemi.com FEATURES PIN ASSIGNMENT Converts full CMOS RAMs into nonvolatile VBAT1 1 20 VCCI memories VCCO 2 19 VBAT2 Unconditionally write protects when VCC is out of tolerance TOL 3 18 CE Automatically switches to battery when PF 4 17 CE0 power-fail occurs VBAT1 1 20 VCCI 3 to 8 decoder provides control for up to eight 5 16 CE1 CE7

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