Diodes APX803/D - Manual

APX803/D
3-PIN MICROPROCESSOR RESET CIRCUIT
APX803
Document number: DS32132 Rev. 2 - 2
1 of 11
www.diodes.com
September 2010
© Diodes Incorporated
Description
The APX803/D 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 V
CC
supply voltage
declines below a preset threshold, keeping it asserted for a
fixed period of time after V
CC
has risen above the reset
threshold. For the APX803D this period is a minimum of 1ms
while for other APX803 variants it is at least 140ms. 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.
The APX803 is available with different reset thresholds
suitable for operation with a variety of supply voltages,
however the APX803D is available with a 2.93V threshold
voltage.
The APX803/D have an open collector active low RESET
output and compliment Diodes APX809/10 which have push-
pull output stages.. Low supply current makes the APX803/D
ideal for use in portable equipment. The APX803/D are
available in two pin out variants of the 3-pin SOT23 package.
Pin Assignments
( Top View )
1
2
GND
V
CC
APX803
2
3
RESET
SOT23
( Top View )
1
2 GND
V
CC
APX803
2
3
RESET
SOT23R
Features
• Precision Monitoring of +2.5V, +3V, +3.3V, and +5V
Power-Supply Voltages
• Fully Specified Over Temperature
• Open-drain
RESET
Active Low
• Power-On/power supply glitch Reset Pulse
• APX803D 2ms (Typ)
• APX803 200ms (Typ)
• 30µA Supply Current (Typ.)
• Guaranteed Reset Valid to VCC = +1V
• No External Components
• SOT23 and SOT23R: Available in “Green” Molding
Compound (No Br, Sb)
• Lead Free Finish/ RoHS Compliant (Note 1)
Applications
• Computers
• Controllers
• Intelligent
Instruments
• Critical µP and µC Power Monitoring
• Portable/Battery Powered Equipment
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.