MAX809 Datasheet

• Precision Monitoring of +2.5V, +3V, +3.3V, and +5V Power-Supply Voltages
• Fully Specified Over Temperature
• Available in Three Output Configurations
  • Push-Pull Active-Low RESET Output (MAX809)
• 140ms min Power-On Reset Pulse Width
• 12µA Supply Current
• Guaranteed Reset Valid to V_CC= +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

• Automotive
• Computers: Desktop, Workstation, Server
• Controllers
• Critical µP and µC Power Monitoring
• Intelligent Instruments
• Portable Battery-Powered Equipment

The MAX809 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 V_CC supply voltage declines below a preset threshold, keeping it asserted for at least 140ms after V_CC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply voltages are available.

The MAX809 have push-pull outputs. The MAX809 have an active-low RESET output. The reset comparator is designed to ignore fast transients on V_CC, and the outputs are guaranteed to be in the correct logic state for V_CC down to 1V.

Low supply current makes the MAX809 ideal for use in portable equipment. The MAX809 are available in 3-pin SC70 or SOT23 packages.