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DS1642：非易失时钟RAM

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.

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

功能框图

关键参数

数据手册DataSheet

技术资料

• Tips for Writing Bulletproof Real-Time Clock Control Code
• State Machine Logic in Binary-Coded Decimal (BCD)-Formatted Real-Time Clocks
• Using a Nonvolatile Timekeeping RAM with a Microcontroller
• Lithium Coin-Cell Batteries: Predicting an Application Lifetime
• Design Considerations for Maxim Real-Time Clocks

质量和环境数据

• DS1642.pdf

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