DS1644

非易失时钟RAM

数据手册 (Rev. 3)

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产品详情

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 Compensation Valid Up to 2100
Power-Fail Write Protection Allows for ±10% V_CC Power Supply Tolerance
DS1644 Only (DIP Module)
- Upward Compatible with the DS1643 Timekeeping RAM to Achieve Higher RAM Density
- Standard JEDEC Bytewide 32k x 8 Static RAM Pinout
DS1644P Only (PowerCap Module Board)
- Surface Mountable Package for Direct Connection to PowerCap Containing Battery and crystal
- Replaceable Battery (PowerCap)
- Power-Fail Output
- Pin-for-Pin Compatible with Other Densities of DS164XP Timekeeping RAM

参考资料

数据手册 2

DS1644-DS1644P: Nonvolatile Timekeeping RAM Data Sheet (Rev.3) 04/15/2010

2744: 非易失时钟RAM Data Sheet 01/01/1900

可靠性数据 1

DS1644 Reliability Data 01/12/2023

设计笔记 4

Maxim产品中的内嵌锂电池\r\n 07/24/2011

Design Considerations for Analog Devices Real-Time Clocks 02/15/2002

PowerCap Package Allows for Density Upgrades, Surface Mount Assembly 05/30/2002

Using a Nonvolatile Timekeeping RAM with a Microcontroller 03/07/2003

技术文章 2

State Machine Logic in Binary-Coded Decimal (BCD)-Formatted Real-Time Clocks 09/17/2012

Tips for Writing Bulletproof Real-Time Clock Control Code 03/28/2014

这是最新版本的数据手册

硬件生态系统

部分模型	产品周期	描述
DS9034PCX	推荐新设计使用	PowerCap，带有晶振

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