rt9818a-49gvl Richtek Technology Corporation, rt9818a-49gvl Datasheet - Page 9

• Manufacturer Part Number: rt9818a-49gvl
• Description: Micro-power Voltage Detectors
• Manufacturer: Richtek Technology Corporation

RT9818
Application Information
Multiple Supplies
Mainly, the pull-up connected to the RT9818 will connect to the supply voltage that is being monitored at the IC’ s
VDD
pin. However, some systems may use the open-drain output to level-shift from the monitored supply to reset circuitry
powered by some other supply.
Benefits of Highly Accurate Reset Threshold
Most μP supervisor ICs have reset threshold voltages between 1% and 1.5% below the value of nominal supply voltages.
This ensures a reset will not occur within 1% of the nominal supply, but will occur when the supply is 1.5% below
nominal.
DS9818-05 March 2007
www.richtek.com
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