APX803-29SAG-7 Datasheet, PDF (1/10 Pages) Diodes Incorporated – 3-PIN MICROPROCESSOR RESET CIRCUIT

APX803
3-PIN MICROPROCESSOR RESET CIRCUIT
Features
• Precision Monitoring of +2.5V, +3V, +3.3V, and +5V
Power-Supply Voltages
• Fully Specified Over Temperature
• Available in three Output Configurations
• Open-drain RESET Active Low
• 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 (Note 1)
General Description
The APX803 is 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 on power up and whenever the VCC supply voltage
declines below a preset threshold, keeping it asserted for at least
140ms after VCC has risen above the reset threshold. Reset
thresholds suitable for operation with a variety of supply voltages
are available. The APX803 have an open collector active low
RESET output. The reset comparator is designed to ignore
fast transients on VCC, and the outputs are guaranteed to be in
the correct logic state for VCC down to 1V. Low supply current
makes the APX803 ideal for use in portable equipment. The
APX803 is available in two pin out variants of the 3-pin SOT23
and SOT23R packages.
Applications
• Computers
• Controllers
• Intelligent Instruments
• Critical µP and µC Power Monitoring
• Portable/Battery Powered Equipment
Typical Application Circuit
Vcc
C_IN
100nF
Vcc
APX803
RESET
Vcc
Microprocessor
RESET
INPUT
GND
GND
APX803
Document number: DS32132 Rev. 1 – 2
1 of 10
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MARCH 2010
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