DS1642

非易失时钟RAM


点击查看特定型号的库存状况。

说明

The DS1642 is a 2k x 8 nonvolatile static RAM and a full-function real-time clock (RTC), both of which are accessible in a bytewide format. The nonvolatile time keeping RAM is pin and function equivalent to any JEDEC-standard 2k x 8 SRAM. The device can also be easily substituted in ROM, EPROM, and EEPROM sockets, providing read/write nonvolatility and the addition of the real-time clock function. The real-time clock information resides in the eight uppermost RAM locations. The RTC registers contain year, month, date, day, hours, minutes, and seconds data in 24-hour BCD format. Corrections for the day of the month and leap year are made automatically. The RTC clock registers are double-buffered to avoid access of incorrect data that can occur during clock update cycles. The double-buffered system also prevents time loss as the timekeeping countdown continues unabated by access to time register data. The DS1642 also contains its own power-fail circuitry, which deselects the device when the VCC supply is in an out-of-tolerance condition. This feature prevents loss of data from unpredictable system operation brought on by low VCC as errant access and update cycles are avoided.
DS1642:原理框图 DS1642:原理框图 放大+

关键特性

  • 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

CAD Symbols and Footprints

  • DS1642-100
  • DS1642-85+
  • 型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C  

    备注: 通过技术手段对故障率进行汇总,并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

    质量管理体系 >
    环境管理体系 >

     
    Status:
    Package:
    Temperature:

    相关资料


    MAX31341B
    低电流、实时时钟,具有I2C接口和电源管理

    • 延长电池寿命
    • 提供灵活的配置
    • 节省电路板面积

    MAX31342
    Low-Current, Real-Time Clock with I2C Interface

    • Increases Battery Life
    • Provides Flexible Configurability
    • Saves Board Space