DS1314

3V Nonvolatile Controller with Lithium Battery Monitor


Please check latest availability status for a specific part variant.

Description

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: Functional Block Diagram DS1314: Functional Block Diagram Enlarge+

Key Features

  • 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
Part NumberCE Cntrl.Smart Socket w/Int. Batt.Li Batt. MonitorPwr. Fail OutRAMs ControlledVSUPPLY
(V)
Package/PinsOper. Temp.
(°C)
Budgetary
Price
See Notes
DS1314 YesNoYesYes13.3
PDIP/8
SOIC (N)/8
SOIC (W)/16
TSSOP/20
-40 to +85$6.19 @1k
See All Non-Volatile RAM Controllers (6)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Technical Documents

App Note 3254 Battery Monitoring in NV SRAM Modules
App Note 202 NV SRAM Frequently Asked Questions

Quality and Environmental Data

Product Reliability Reports: DS1314.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • DS1314+
  • DS1314E+
  • DS1314E+T&R
  • DS1314S+
  • DS1314S+T&R
  • DS1314S-2+
  • DS1314S-2+T&R
  • DS1314S-2+T&R/C04
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

     
    Status:
    Package:
    Temperature:

    Related Resources


    MAX16136
    High-Precision Supervisory with Window Watchdog and Overvoltage Indicator

    • ±1% Accuracy
    • Enables ASIL Compliance at System Level
    • 0.5V to 5V Threshold Range with 20mV Increments

    MAX16160
    High-Accuracy 4-Channel, Any-Input Supervisory Circuits

    • Valid Active-Low RESET Logic State for Any Input Above 1V
    • ±1% Accuracy for All Inputs
    • Low 17μA Supply Current