19-5058; Rev 5/10 com DS1643/DS1643P Nonvolatile Timekeeping RAMs www.
maxim-ic.
com FEATURES  Integrated NV SRAM, Real-Time Clock, Crystal, Power-Fail Control Circuit and Lithium Energy Source  Clock Registers are Accessed Identically to the Static RAM.
These Registers Reside in the Eight Top RAM Locations.
 Totally Nonvolatile with Over 10 Years of Operation in the Absence of Power  Access Times of 85ns and 100ns  BCD-Coded Year, Month, Date, Day, Hours, Minutes, and Seconds with Leap Year Compensation Valid Up to 2100  Power-Fail Write Protection Allows for ±10% VCC Power Supply Tolerance  Lithium Energy Source is Electrically Disconnected to Retain Freshness Until...

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