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Maxim > Products > [Supervisors, Voltage Monitors, Sequencers] 
DS1312
Nonvolatile Controller with Lithium Battery Monitor


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 192kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The DS1312 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 DS1312 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 DS1312 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.

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
  • Optional 5% or 10% power-fail detection
  • 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
  • Underwriters Laboratories (UL®) Recognized

Key Specifications:  Non-Volatile RAM Controllers
Part Number CE Cntrl. Smart Socket w/Int. Batt. Li Batt. Monitor Pwr. Fail Out RAMs Controlled Reset Out VSUPPLY
(V)		 Package/Pins Smallest Available Pckg.
(mm2)		 Price
max w/pins See Notes
DS1312  Yes No Yes No 1 Yes (except 8-pin pckgs) 5
PDIP(N)/8
SOIC(N)/8
TSSOP/20
 31 $4.86 @1k
See All Non-Volatile RAM Controllers (13)

Diagram
DS1312: Functional Block Diagram
Functional Block Diagram

Reliability Reports
  		• Reliability Report: DS1312.pdf
  		• Underwriters Laboratories (UL®) Recognized

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-12 of 12

    DS1312 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1312    
    		Active PDIP(N);8 pin;80 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P8-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1312S    
    		Active SOIC(W);16 pin;112 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0107 (PDF)
    Use pkgcode/variation: W16-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1312S/T&R    
    		Active SOIC(W);16 pin;112 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0107 (PDF)
    Use pkgcode/variation: W16-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1312S+  
    		Active SOIC(W);16 pin;112 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0107 (PDF)
    Use pkgcode/variation: W16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1312S+T&R    
    		Active SOIC(W);16 pin;112 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0107 (PDF)
    Use pkgcode/variation: W16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1312S-2    
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1312S-2/T&R    
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1312S-2+  
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1312E    
    		Active TSSOP;20 pin;45 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0116 (PDF)
    Use pkgcode/variation: U20-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1312E/T&R    
    		Active TSSOP;20 pin;45 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0116 (PDF)
    Use pkgcode/variation: U20-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1312E+    
    		Active TSSOP;20 pin;45 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0116 (PDF)
    Use pkgcode/variation: U20+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1312E+T&R    
    		Active TSSOP;20 pin;45 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0116 (PDF)
    Use pkgcode/variation: U20+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• UL Certified

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    Document Ref.: xxxx; 2004-09-15
    This page last modified: 2009-10-26


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