APX809

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APX809
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Description

The APX809/810 are used for microprocessor (µP) supervisory circuits 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 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 240ms after V_CC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply voltages are available. The APX809/810 have push pull outputs. The APX809 have an active low RESET output, while the APX810 has an active high 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 APX809/810 ideal for use in portable equipment. The APX809/810 is available in a 3-pin SOT23 and SOT23R package.

Features and Benefits

• Precision Monitoring of +2.5V, +3V, +3.3V, and +5V Power-Supply Voltages
• Fully Specified Over Temperature
• Available in three Output Configurations
• Push-Pull RESET Active Low (APX809)
• Push-Pull RESET Active High (APX810)
• 200ms Typ Power-On Reset Pulse Width
• 30μA Supply Current (Typ.)
• Guaranteed Reset Valid to V_CC = +1V
• No External Components
• SOT23 and SOT23R: Available in “Green” Molding Compound (No Br, Sb)
• Lead Free Finish/RoHS Compliant

Applications

• Computers
• Controllers
• Intelligent Instruments
• Critical μP and μC Power Monitoring
• Portable/Battery Powered Equipment
• Automotive

Part Number	APX809
Detect Voltages V	2.25/ 2.63/ 2.93/ 3.08/ 4.00/ 4.38/ 4.63
Minimum Input Voltage V	1
Maximum Input Voltage V	5.5
Quiescent Current uA	20
Typical Time Delay ms	200
RESET Output ;Active High	N
RESET Output ;Active Low	Y
MR	N
Watchdog	N
Reset Output Topology	Push - Pull
Operating Ambient Temp Range °C	-40 - +85

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