MAX809 – Voltage Supervisor, Microprocessor Reset Chip

MAX809 is a cost-effective system supervisor IC in a tiny SOT23-3/SC70-3 package. It is designed to monitor the supply voltage of a host processor and provide a reset signal when necessary. This will ensure that the microprocessor is initialised correctly, and no low voltage glitch occurs. MAX809 provides the best value for money by eliminating external components. The MAX809 will activate the reset output within 10us once VCC reached the reset voltage threshold and will keep the microprocessor in the reset state for at least 140ms ensuring that the microprocessor is reset correctly. The MAX809 are optimized to reject any transient glitches in the VCC line. The MAX809 has a push-pull output stage while its counterpart MAX803 has an open-drain output. 

MAX809 Pinout Configuration

Features

• Precision Monitoring of Power-Supply Voltages
• Fully Specified Over Temperature
• Push-Pull Active-Low RESET Output
• 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

Note: The Complete Technical Details can be found on the MAX809 datasheet given at the end of this page.

Equivalent for MAX809: MAX803,

Alternative for MAX809: MAX810, LM809, ZXCM809, NCV809

How to Use the MAX809?

Integrating MAX809 into your design is simple. The connections are straightforward. Connect the VCC pin to the VCC line of the microprocessor, GND to the GND and the RESET out to the RESET pin of the microprocessor. The application circuit for MAX809 is given below.

Applications

• Automotive
• Computers: Desktop, Workstation, Server
• Critical µP and µC Power Monitoring
• Intelligent Instruments
• Portable Battery-Powered Equipment
• Embedded Systems
• Infotainment
• Instrument Cluster

Selection Table

2D-Model (SOT-23) and Dimensions