DS1819C

5 Volt and 3.3 Volt MicroMonitor


Please check latest availability status for a specific part variant.

Description

The DS1814 5-Volt MicroMonitor and the DS1819 3.3V MicroMonitor monitor three vital conditions for a microprocessor: power supply, software execution, and external override. First, a precision temperature-compensated reference and comparator circuit monitor the status of VCC. When an out-of-tolerance condition occurs, an internal power-fail signal is generated which forces the reset(s) to an active state. When VCC returns to an in-tolerance condition, the reset signal is kept in the active state for a minimum of 140ms to allow the power supply and processor to stabilize. The DS1814/DS1819 ‘A' and ‘C' perform pushbutton reset control. They debounce the pushbutton input and generate an active reset pulse width of 140ms minimum. The DS1814/9 'A' and 'B' versions perform a watchdog function. The watchdog is an internal timer that forces the reset signals to the active state if the strobe input does not change state every 1.12 seconds. The watchdog timer function can be disabled by leaving the watchdog strobe input disconnected.
DS1814, DS1819: Block Diagram DS1814, DS1819: Block Diagram Enlarge+

Key Features

  • Halts and restarts an out-of-control microprocessor
  • Holds microprocessor in check during power transients
  • Automatically restarts microprocessor after power failure
  • Monitors pushbutton for external override
  • Accurate 5%, 10%, or 20% (3V only) microprocessor power monitoring
  • Eliminates the need for discrete components
  • 20% tolerance for use with 3.0V systems
  • Pin- and function-compatible with the MAX823/24/25 products
  • Low cost SOT-23-5 package
  • Industrial temperature range: -40°C to +85°C
Part NumberReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureWatchdog TimeoutSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
DS1814A 3.3 to 5.5
Active Low
Push-Pull
85ms to 300msInput (WDI)1s to 2sManual Reset2.515
SOIC(N)/8
$0.72 @1k
DS1814B 3.3 to 5.5
Active High
Active Low
Push-Pull
Input (WDI)1s to 2s-15
SOIC(N)/8
$0.72 @1k
DS1814C 3.3 to 5.5
Active High
Active Low
Push-Pull
No Watchdog-Manual Reset15
SOIC(N)/8
$0.72 @1k
DS1819A 2.5 to 3.3
Active Low
Push-Pull
Input (WDI)1s to 2sManual Reset12
SOIC(N)/8
$2.17 @1k
DS1819B 2.5 to 3.3
Active High
Active Low
Push-Pull
Input (WDI)1s to 2s-12
SOIC(N)/8
$2.17 @1k
DS1819C 2.5 to 3.3
Active High
Active Low
Push-Pull
No Watchdog-Manual Reset12
SOIC(N)/8
$2.17 @1k
See All Supervisors (1 Monitored Voltage) (261)
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.

Quality and Environmental Data

Request Reliability Report for: DS1819C 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • DS1819CR-10+T&R
  • DS1819CR-10-U+
  • DS1819CR-20+T&R
  • DS1819CR-20-U+
  • DS1819CR-5+T&R
  • DS1819CR-5-U+
  • 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 >

     
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