DS1831D:3.3V/2.5V Multisupply Micromonitor

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.

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
DS1831C, DS1831D, DS1831E: Block Diagram
DS1831C, DS1831D, DS1831E: Block Diagram
DataSheet
titleDownload file
DS1831C-DS1831E Data SheetDS1831C-DS1831E.pdf
Parametrics
Part NumberInterfaceReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureWatchdog TimeoutSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
DS1831CFactory 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 Reset2.5100PDIP(N)/16
SOIC(N)/16
$2.99 @1k
DS1831DInput/Output (WDI/WDO)
Pin Selectable
1s to 2s
<1s
PDIP(N)/16
SOIC(N)/16
$2.99 @1k
DS1831ENo Watchdog-PDIP(N)/16
SOIC(N)/16
$3.08 @1k
Ordering Information
Part NumberNotesStatusRecommended ReplacementPackageTempRoHS
DS1831Dw/WDNo Longer AvailableDS1831D+PDIP(N),;16 pin;158.4 mm²-40°C to +85°CNo
DS1831D+ActivePDIP(N),;16 pin;158.4 mm²-40°C to +85°CLead Free
DS1831DSw/WDNo Longer AvailableDS1831DS+SOIC(N),;16 pin;61.9 mm²-40°C to +85°CNo
DS1831DS+ActiveSOIC(N),;16 pin;61.9 mm²-40°C to +85°CLead Free
DS1831DS+T&RActiveSOIC(N),;16 pin;61.9 mm²-40°C to +85°CLead Free
DS1831DS/T&Rw/WDNo Longer AvailableDS1831DS+T&RSOIC(N),;16 pin;61.9 mm²-40°C to +85°CNo
DS1831C-DS1831E.pdf DS1831E
Adding Hysteresis to CPU Supervisor Voltage Sense Inputs Monitoring Upstream Voltage Supplies for Power-Fail Warnings DS1831E
DS1831C-DS1831E.pdf DS1831E