DS1642

Nonvolatile Timekeeping RAM

Part Details

  • Integrated NV SRAM, Real-Time Clock, Crystal, Power-Fail Control Circuit, and Lithium Energy Source
  • Standard JEDEC Bytewide 2k x 8 Static RAM Pinout
  • 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
  • Access Times of 85ns and 100ns
  • Quartz Accuracy ±1 Minute a Month at +25°C, Factory Calibrated
  • 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 Power is Applied for the First Time
DS1642
Nonvolatile Timekeeping RAM
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