View ds1231 d datasheet:

DS1231/S DS1231/S Power Monitor Chip FEATURES PIN ASSIGNMENT � Warns processor of an impending power failure 1 8 IN VCC � Provides time for an orderly shutdown 2 NMI 7 MODE � Prevents processor from destroying nonvolatile 3 RST 6 TOL memory during power transients 4 5 RST GND � Automatically restarts processor after power is DS1231 8�Pin DIP restored (300 MIL) See Mech. Dra

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BJT: SBT42 | 2SA200-Y | 2SA200-O | 2SD882-Q | 2SD882-P | 2SD882-E | 2SC945-L | 2SC945-H | 2SC4226-R23 | 2SC3357-F | 2SC3357-E | 2SC3356-R26 | 2SC3356-R24 | 2SC3356-R23 | 2SB772-Q | 2SB772-P | 2SB772-E | 2SA1015-L | 2SA1015-H | HSS8550 | HSS8050