The MAX803/MAX809/MAX810SEUR are microprocessor (μP) supervisory circuits used to monitor the power supplies in μP and digital systems. They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with +5V, +3.3V, +3.0V, or +2.5V powered circuits. These circuits perform a single function: they assert a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for at least 140ms after VCC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply voltages are available. The MAX803 has an open-drain output stage, while the MAX809/MAX810SEUR have push-pull outputs. The MAX803's open-drain active-low RESET output requires a pullup resistor that can be connected to a voltage higher than VCC. The MAX803/MAX809 have an active-low RESET output, while the MAX810SEUR has an active-high RESET output. The reset comparator is designed to ignore fast transients on VCC, and the outputs are guaranteed to be in the correct logic state for VCC down to 1V. Low supply current makes the MAX803/MAX809/MAX810SEUR ideal for use in portable equipment. The MAX803 is available in a 3-pin SC70 package, and the MAX809/MAX810SEUR are available in 3-pin SC70 or SOT23 packages.
Feature
- Precision Monitoring of +2.5V, +3V, +3.3V, and +5V Power-Supply Voltages
- Fully Specified Over Temperature
- Available in Three Output Configurations
- Open-Drain Active-Low RESET Output (MAX803)
- Push-Pull Active-Low RESET Output (MAX809)
- Push-Pull RESET Output (MAX810)
- 140ms min Power-On Reset Pulse Width
- 12μA Supply Current
- Guaranteed Reset Valid to VCC= +1V
- Power Supply Transient Immunity
- No External Components
- 3-Pin SC70 and SOT23 Packages
- AEC-Q100 Qualified. Refer to Ordering Information for Specific /V Versions
Applications
- Automotive
- Computers: Desktop, Workstation, Server
- Controllers
- Critical μP and μC Power Monitoring
- Intelligent Instruments
- Portable Battery-Powered Equipment
