View ds1312 datasheet:

DS1312 Nonvolatile Controller with Lithium Battery Monitor www.dalsemi.com FEATURES PIN ASSIGNMENT Converts CMOS SRAM into nonvolatile memory VCCO 1 8 VCCI VCCO 1 8 VCCI VBAT 2 7 BW VBAT 2 7 BW Unconditionally write-protects SRAM when TOL 3 6 CEO TOL 3 6 CEO VCC is out of tolerance 5 5 GND 4 CEI GND 4 CEI Automatically switches to battery backup supply when VCC power failure occur

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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