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Serial I²C bus real-time clock (RTC) with battery switchover
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5 V, 64 Kbit (8 Kb x 8) TIMEKEEPER® SRAM
5.0 or 3.3 V, 256 Kbit (32 Kbit x 8) TIMEKEEPER® SRAM
5 V, 64 Kbit (8 Kb x 8) ZEROPOWER® SRAM