Datasheet Summary
19-5203; Rev 4/10
DS1644/DS1644P Nonvolatile Timekeeping RAM
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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 are Resident in the Eight Top RAM Locations.
- Totally Nonvolatile with Over 10 Years of Operation in the Absence of Power
- BCD-Coded Year, Month, Date, Day, Hours, Minutes, and Seconds with Leap Year pensation Valid Up to 2100
- Power-Fail Write Protection Allows for ±10% VCC Power Supply Tolerance
- DS1644 Only (DIP Module)
Upward patible with the DS1643 Timekeeping RAM to Achieve Higher RAM Density
Standard JEDEC...
