3.3V/2.5V Multisupply Micromonitor

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The DS1831C multisupply monitor and reset monitors up to four system voltages: 2.5V supply, 3.3V (or 3V) supply, and two additional user configurable voltage monitors. DS1831 power for internal operation comes from the higher voltage level of the 3.3V input or the 2.5V input. One of these inputs must be greater than 1V for device operation. Pushbutton (manual reset) functionality is provided for the 2.5V reset, the 3.3V reset or for all reset outputs by the master pushbutton. The DS1831D replaces one reference comparator and the master pushbutton with watchdog and the DS1831E replaces the 3.3V active-low PBRST with a last reset status output.

TOL and TD inputs allow user configuration of the DS1831 for multiple applications. The TOL inputs configure the tolerance for the specified output and the TD inputs configure the reset time delays.
DS1831C, DS1831D, DS1831E: Block Diagram DS1831C, DS1831D, DS1831E: Block Diagram Enlarge+

Key Features

  • 2.5V power-on reset
  • 3.3V (or 3V) power-on reset
  • Two referenced comparators with separate outputs for monitoring additional supplies
  • Internal power is drawn from higher of either the IN2.5V input or the IN3.3V input
  • Excellent for systems designed to operate with multiple power supplies
  • Asserts resets during power transients
  • Pushbutton reset input for system override
  • Maintains reset for user configurable times of 10ms, 100ms, or 1s
  • Watchdog timer for software monitoring (DS1831D)
  • Precision temperature-compensated voltage reference and voltage sensor
  • 16-pin DIP and 16-pin, 150mil SO available
  • Operating temperature of -40°C to +85°C

See parametric specs for Supervisors (4 Monitored Voltages) (22)

Part NumberInterfaceReset Thresh.
Reset OuttRESETWatchdog FeatureWatchdog TimeoutSupervisor FeaturesReset Thresh. Accur.
min@ +25°CmaxSee Notes
Factory Fixed
R/C Adjustable
2.5 to 3.3
3.3 to 5.5
Active Low
Open Drain
15ms to 85ms
85ms to 300ms
300ms to 1s
No Watchdog-Manual Reset2.5100
SOIC (N)/16
$3.14 @1k
Input/Output (WDI/WDO)
Pin Selectable
1s to 2s
SOIC (N)/16
$3.14 @1k
DS1831E No Watchdog-
SOIC (N)/16
$3.23 @1k

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.
Request Reliability Report for: DS1831E 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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.

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