1. Products
  2. Power Monitor, Control, and Protection
  3. Supervisory Circuits
  4. Supply Monitors with Watchdog Timers
  5. DS1819


Features and Benefits

  • 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

Product Details

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.

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
DS1819AR-10+T&R Material Declaration Reliability Data 5-SOT_23-N/A
DS1819AR-10-U+ Material Declaration Reliability Data 5-SOT_23-N/A
DS1819AR-20+T&R Material Declaration Reliability Data 5-SOT_23-N/A
DS1819AR-20-U+ Material Declaration Reliability Data 5-SOT_23-N/A
DS1819AR-5+T&R Material Declaration Reliability Data 5-SOT_23-N/A
DS1819BR-10+T&R Material Declaration Reliability Data 5-SOT_23-N/A
DS1819CR-10+T&R Material Declaration Reliability Data 5-SOT_23-N/A
DS1819CR-20+T&R Material Declaration Reliability Data 5-SOT_23-N/A
DS1819CR-5+T&R Material Declaration Reliability Data 5-SOT_23-N/A
Wafer Fabrication Data DS1819 Reliability Data

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