The DS1314 Nonvolatile Controller with Battery Monitor is a CMOS circuit which solves the application problem of converting CMOS RAM into nonvolatile memory. Incoming power is monitored for an out-of-tolerance condition. When such a condition is detected, chip enable is inhibited to accomplish write protection and the battery is switched on to supply the RAM with uninterrupted power. Special circuitry uses a low-leakage CMOS process which affords precise voltage detection at extremely low battery consumption.

In addition to battery-backup support, the DS1314 performs the important function of monitoring the remaining capacity of the lithium battery and providing a warning before the battery reaches end-of-life. Because the open-circuit voltage of a lithium backup battery remains relatively constant over the majority of its life, accurate battery monitoring requires loaded-battery voltage measurement. The DS1314 performs such measurement by periodically comparing the voltage of the battery as it supports an internal resistive load with a carefully selected reference voltage. If the battery voltage falls below the reference voltage under such conditions, the battery will soon reach end-of-life. As a result, the Battery Warning pin is activated to signal the need for battery replacement.
DS1314:功能原理框图 DS1314:功能原理框图 放大+


  • Converts CMOS SRAM into nonvolatile memory
  • Unconditionally write-protects SRAM when VCC is out of tolerance
  • Automatically switches to battery backup supply when VCC power failure occurs
  • Monitors voltage of a lithium cell and provides advanced warning of impending battery failure
  • Signals low-battery condition on active low Battery Warning output signal
  • Automatic VCC power-fail detection for 3.0V or 3.3V power supplies
  • Space-saving 8-pin DIP and SOIC packages
  • Optional 16-pin SOIC and 20-pin TSSOP versions reset processor when power failure occurs and hold processor in reset during system power-up
  • Industrial temperature range of -40°C to +85°C

请查看具体的参数规格 Non-Volatile RAM Controllers (6)

Part NumberCE Cntrl.Smart Socket w/Int. Batt.Li Batt. MonitorPwr. Fail OutRAMs ControlledVSUPPLY
Package/PinsOper. Temp.
See Notes
DS1314 YesNoYesYes13.3
SOIC (N)/8
SOIC (W)/16
-40 to +85$6.50 @1k

Pricing Notes:


应用笔记 3254 Battery Monitoring in NV SRAM Modules
应用笔记 202 NV SRAM Frequently Asked Questions
产品可靠性报告: DS1314.pdf 
型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C   Material Composition  

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。

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类型 编号 标题
应用笔记 3254 Battery Monitoring in NV SRAM Modules
应用笔记 202 NV SRAM Frequently Asked Questions