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Maxim > Products > Supervisors, Voltage Monitors, Sequencers 
DS1231
Power Monitor


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Data Sheet
FULL DATA SHEET (PDF, 67kB)
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Description
With precise, temperature-compensated comparators, the DS1231 Power Monitor Chip monitors input power and a 5V system power supply. If unsafe voltages are detected, a nonmaskable interrupt sends a warning signal to the processor in advance of power failure. Processing is unconditionally halted when power falls below a user-selectable 5% or 10% threshold level, with time to shutdown proportional to the available hold-up time of the power supply. Upon return of power, the DS1231 maintains reset until power conditions stabilize.

The DS1231 enhances system reliability by closely monitoring both processor and upstream power levels, warning of impending failure, and automatically suspending and restarting processor operation. An input sense also supports a connection to switched inputs such as an opto-isolator for LED function. All external reset components (i.e., pull-up resistor and delay timing capacitor) are contained in one package, saving space and cost.

Key Features
  • Monitors input and power supply and warns of impending failure
  • Provides orderly shutdown
  • Initiates and holds processor reset until levels are unsafe
  • Tolerance threshold levels can be set for 5% or 10%
  • Automatically restarts processor on power-up
  • Pauses restart until system stabilizes
  • Operating range: 0°C to +70°C (DS1231 and DS1231S)
    -40°C to +85°C (DS1231-N and DS1231S-N)
  • Optional active-low NMI Hysteresis (200mV = "-20", 350mV = "-35", 500mV = "-50")

Key Specifications:   Supervisors (1 Monitored Voltage)
Part Number Reset Threshold Range (V) Active-Low Reset Output Min. Reset Timeout Range Watchdog Feature Supervisor Features Reset Thresh. Acc. (% @+25°C) Max. ICC (µA) RoHS Available Package Operating Temp. Range (°C) Price**
DS1231  3.3 to 5.5 Open Drain 85ms to 300ms No Watchdog Power Fail Comparator 2.5 2000 Yes PDIP/8
SOIC/16 		-40 to +85
0 to +70 		$2.85 @ 1k
See All Supervisors (1 Monitored Voltage) (268)
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 prices and delivery, please see the price and availability page or contact an authorized distributor.

Application Notes
  		• Application Note 245: Adding Hysteresis to CPU Supervisor Voltage Sense Inputs Monitoring Upstream Voltage Supplies for Power-Fail Warnings - DS1231
  		• Application Note 3316: Dallas Semiconductor Microprocessor Supervisor Selection Guide - DS1231

    Evaluation Kits
    none

    Reliability Reports
  		• Reliability Report: DS1231.pdf

    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: 1-30 of 30

    DS1231 Notes Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1231-50+  
    		PDIP;8 pin;
    Dwg: 56-G5005-000
    Use pkgcode/variation: P8+7*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1231-20N+  
    		PDIP;8 pin;
    Dwg: 56-G5005-000
    Use pkgcode/variation: P8+7*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1231-35N+  
    		PDIP;8 pin;
    Dwg: 56-G5005-000
    Use pkgcode/variation: P8+7*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1231-50N+  
    		PDIP;8 pin;
    Dwg: 56-G5005-000
    Use pkgcode/variation: P8+7*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1231-35+  
    		PDIP;8 pin;
    Dwg: 56-G5005-000
    Use pkgcode/variation: P8+7*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1231-20+   200mV Hysteresis
    		PDIP;8 pin;
    Dwg: 56-G5005-000
    Use pkgcode/variation: P8+7*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1231-50   500mV Hysteresis
    		PDIP;8 pin;
    Dwg: 56-G5005-000
    Use pkgcode/variation: P8-7*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1231-20   200mV Hysteresis
    		PDIP;8 pin;
    Dwg: 56-G5005-000
    Use pkgcode/variation: P8-7*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1231-35   350mV Hysteresis
    		PDIP;8 pin;
    Dwg: 56-G5005-000
    Use pkgcode/variation: P8-7*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1231-50/G  
    		PDIP;8 pin;
    Dwg: 56-G5005-000
    Use pkgcode/variation: P8-7*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1231-35N   350mV Hysteresis
    		PDIP;8 pin;
    Dwg: 56-G5005-000
    Use pkgcode/variation: P8-7*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1231-20N   200mV Hysteresis
    		PDIP;8 pin;
    Dwg: 56-G5005-000
    Use pkgcode/variation: P8-7*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1231-50N   500mV Hysteresis
    		PDIP;8 pin;
    Dwg: 56-G5005-000
    Use pkgcode/variation: P8-7*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1231S-20+T&R  
    		SOIC;16 pin;
    Dwg: 56-G4009-001
    Use pkgcode/variation: W16+11*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1231S-35+  
    		SOIC;16 pin;
    Dwg: 56-G4009-001
    Use pkgcode/variation: W16+11*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1231S-35N/T&R  
    		SOIC;16 pin;
    Dwg: 56-G4009-001
    Use pkgcode/variation: W16-11*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1231S-50N/T&R  
    		SOIC;16 pin;
    Dwg: 56-G4009-001
    Use pkgcode/variation: W16-11*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1231S-50N+  
    		SOIC;16 pin;
    Dwg: 56-G4009-001
    Use pkgcode/variation: W16+11*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1231S-20N+  
    		SOIC;16 pin;
    Dwg: 56-G4009-001
    Use pkgcode/variation: W16+11*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1231S-50+  
    		SOIC;16 pin;
    Dwg: 56-G4009-001
    Use pkgcode/variation: W16+11*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1231S-500+T&R  
    		SOIC;16 pin;
    Dwg: 56-G4009-001
    Use pkgcode/variation: W16+11*
    		0°C to +70°C See data sheet
    Materials Analysis
    DS1231S-20+  
    		SOIC;16 pin;
    Dwg: 56-G4009-001
    Use pkgcode/variation: W16+11*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1231S-20   200mV Hysteresis
    		SOIC;16 pin;
    Dwg: 56-G4009-001
    Use pkgcode/variation: W16-11*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1231S-20/T&R   200mV Hysteresis
    		SOIC;16 pin;
    Dwg: 56-G4009-001
    Use pkgcode/variation: W16-11*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1231S-35   350mV Hysteresis
    		SOIC;16 pin;
    Dwg: 56-G4009-001
    Use pkgcode/variation: W16-11*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1231S-35/T&R   350mV Hysteresis
    		SOIC;16 pin;
    Dwg: 56-G4009-001
    Use pkgcode/variation: W16-11*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1231S-50   500mV Hysteresis
    		SOIC;16 pin;
    Dwg: 56-G4009-001
    Use pkgcode/variation: W16-11*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1231S-500/T&R  
    		SOIC;16 pin;
    Dwg: 56-G4009-001
    Use pkgcode/variation: W16-11*
    		0°C to +70°C See data sheet
    Materials Analysis
    DS1231S-20N   200mV Hysteresis
    		SOIC;16 pin;
    Dwg: 56-G4009-001
    Use pkgcode/variation: W16-11*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1231S-50N   500mV Hysteresis
    		SOIC;16 pin;
    Dwg: 56-G4009-001
    Use pkgcode/variation: W16-11*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis

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    1998-02-26
    This page last modified: 2007-07-25




             


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