MAX811, MAX812
4-Pin µP Reset Monitors
The MAX811 and MAX812 are cost–effective system supervisor
circuits designed to monitor VCC in digital systems and provide a reset
signal to the host processor when necessary. A manual reset input is
provided to override the reset monitor, and is suitable for use as a
push–button reset. No external components are required.
The reset output is driven active within 20 µsec (4 µsec for
F version) of VCC falling through the reset voltage threshold. RESET
is maintained active for a minimum of 140 msec after VCC rises above
the reset threshold. The MAX812 has an active–high RESET output
while the MAX811 has an active–low RESET output. The output of
the MAX811 is guaranteed valid down to VCC = 1 V. Both devices are
available in a 4–Pin SOT–143 package.
The MAX811/12 are optimized to reject fast transient glitches on
the VCC line. Low supply current of 7 µA (VCC = 3.3 V) makes these
devices suitable for battery powered applications.
4
3
1
SOT–143
CASE 318A
2
PIN CONNECTIONS
Features
• Precision VCC Monitor for 1.8 V, 2.7 V, 3.0 V, 3.3 V, 5.0 V
•
•
•
•
•
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http://onsemi.com
Nominal Supplies
Manual Reset Input
140 msec Guaranteed Minimum RESET, RESET Output Duration
RESET Output Guaranteed to VCC = 1.0 V (MAX811)
Low 7 µA Supply Current
VCC Transient Immunity
Small SOT–143–4 Package
No External Components
GND
MAX811 (RESET)
MAX812 (RESET)
1
4 VCC
2
3 MR
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 6 of this data sheet.
Typical Applications
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•
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Computers
Embedded Systems
Battery Powered Equipment
Critical µP Power Supply Monitoring
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 6 of this data sheet.
VCC
VCC
PROCESSOR
VCC
MAX811
RESET
INPUT
(ACTIVE LOW)
GND
MR
PUSH–
BUTTON
GND
RESET
Typical Operating Circuit
© Semiconductor Components Industries, LLC, 2002
May, 2002 – Rev. 4
1
Publication Order Number:
MAX811/D
