Datasheet
General Description
The MAX803/MAX809/MAX810 are microprocessor (μP)
supervisory circuits used 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, or
+2.5V powered circuits.
These circuits perform a single function: they assert a
reset signal whenever the V
CC
supply voltage declines
below a preset threshold, keeping it asserted for at least
140ms after V
CC
has risen above the reset threshold.
Reset thresholds suitable for operation with a variety of
supply voltages are available.
The MAX803 has an open-drain output stage, while the
MAX809/MAX810 have push-pull outputs. The MAX803’s
open-drain RESET output requires a pullup resistor that
can be connected to a voltage higher than V
CC
. The
MAX803/MAX809 have an active-low RESET output,
while the MAX810 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 MAX803/MAX809/MAX810
ideal for use in portable equipment. The MAX803 is
available in a 3-pin SC70 package, and the MAX809/
MAX810 are available in 3-pin SC70 or SOT23 packages.
Applications
● Computers
● Controllers
● Intelligent Instruments
● Critical μP and μC Power Monitoring
● Portable/Battery-Powered Equipment
● Automotive
Benets and 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 Output (MAX803)
• Push-Pull RESET Output (MAX809)
• Push-Pull RESET Output (MAX810)
● 140ms (min) Power-On-Reset Pulse Width
● 12μA Supply Current
● Guaranteed Reset Valid to V
CC
= +1V
● Power Supply Transient Immunity
● No External Components
● 3-Pin SC70 and SOT23 Packages
● AEC-Q100 Qualified. Refer to Ordering Information
for Specific /V Versions.
19-0344; Rev 11; 10/17
Selector Guide and Ordering Information appear at end of data
sheet.
MAX803
MAX809
V
CC
V
CC
R
PULLUP
*
RESET
RESET
INPUT
GND
V
CC
GND
*MAX803 ONLY
µP
MAX803/MAX809/
MAX810
3-Pin Microprocessor Reset Circuits
Typical Operating Circuit