General Description
The MAX6819/MAX6820 are power-supply sequencers for dual-voltage microprocessors (µPs) and multivoltage systems. These devices monitor a primary supply voltage and enable/disable an external n-channel MOSFET switch for a secondary supply voltage. The MAX6819/MAX6820 control local component voltage sequencing when system power-on/power-off characteristics cannot be guaranteed (supplies come from a multivoltage system bus, silver box, or must be sequenced in different modes for components on the same board). These small power-supply sequencers improve system reliability.

Features
♦ Adjustable Primary Supply Voltage Monitor
   (Monitors Down to 0.62V)
♦ Internal Charge Pump to Enhance External
   Secondary Supply n-Channel MOSFET Switch
♦ Delay from Primary Supply Good to Secondary
   Supply Enabled
   Factory Fixed 200ms (MAX6819)
   Capacitor Adjustable (MAX6820)
♦ Logic Driven ENABLE Input (MAX6819)
♦ Immune to Short Voltage Transients
♦ Few External Components
♦ -40°C to +125°C Operating Temperature Range
♦ Small 6-Pin SOT23 Package

Applications
   Dual-Voltage Microprocessors
   Multivoltage Systems
   Digital Signal Processors
   Power PC™ Series Processors