• High Accuracy Voltage Threshold (< 1%)

•Precision Under-Voltage Monitoring:

   Supports Common Rails of 1.8V, 2.5V, 3V, 3.3V and 5V

   0.5% Typical Hysteresis

• Factory-Programmed Precision Watchdog and Reset Timers:

   ±15% Accurate WDT and RST Delays

• User-Programmable Watchdog Timeout

• Input Voltage Range: 1.6V to 6.5V

• Low Supply Current: 1.2μA (TYP)

• Open-Drain Outputs

• Watchdog Disable Feature

• Manual Reset Input (nMR)

• -40℃ to +125℃ Operating Temperature Range

• Available in Green TDFN-3×3-8L and TDFN-2×2-8L Packages

The SGM820 combines a precision voltage supervisor with a programmable watchdog timer. The SGM820 is suitable for monitoring common rail voltages of 1.8V, 2.5V, 3V, 3.3V and 5V. The SGM820 comparator achieves a high accuracy (-40℃ to +125℃) for the under-voltage threshold and also includes accurate hysteresis, making the device ideal for use with tight tolerance systems. The supervisor nRESET delay features a high accuracy, high-precision delay timing.

The SGM820 includes a programmable watchdog timer for a wide variety of applications. The dedicated watchdog output (nWDO) enables increased resolution to help determine the nature of fault conditions. The watchdog timeouts can be programmed either by an external capacitor, or by factory-programmed default delay settings. The watchdog can be disabled via logic pins to avoid undesired watchdog timeouts during the development process.