MAX812(2018) View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX812 Datasheet PDF : 9 Pages
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MAX811/MAX812
General Description
The MAX811/MAX812 are low-power microprocessor
(μP) supervisory circuits used to monitor power supplies
in μP and digital systems. They provide excellent circuit
reliability and low cost by eliminating external compo-
nents and adjustments when used with 5Vpowered or
3V-powered circuits. The MAX811/MAX812 also provide
a debounced manual reset input.
These devices perform a single function: They assert a
reset signal whenever the VCC supply voltage falls below
a preset threshold, keeping it asserted for at least 140ms
after VCC has risen above the reset threshold. The only
difference between the two devices is that the MAX811
has an active-low RESET output (which is guaranteed
to be in the correct state for VCC down to 1V), while the
MAX812 has an active-high RESET output. The reset
comparator is designed to ignore fast transients on VCC.
Reset thresholds are available for operation with a variety
of supply voltages.
Low supply current makes the MAX811/MAX812 ideal for
use in portable equipment. The devices come in a 4-pin
SOT143 package.
Applications
●● Computers
●● Controllers
●● Intelligent Instruments
●● Critical μP and μC Power Monitoring
●● Portable/Battery-Powered Equipment
Typical Operating Circuit
VCC
VCC
MAX811
MAX812
RESET
MR
(RESET)
GND
VCC
µP
RESET
INPUT
GND
PUSHBUTTON
SWITCH
( ) ARE FOR MAX812
4-Pin μP Voltage Monitors
with Manual Reset Input
Benefits and Features
●● Integrated Voltage Monitor Increases System
Robustness with Added Manual Reset
• Precision Monitoring of 3V, 3.3V, and 5V
Power-Supply Voltages
• 140ms Min Power-On-Reset Pulse Width
• RESET Output (MAX811), RESET Output
(MAX812)
• Guaranteed Over Temperature
• Guaranteed RESET Valid to VCC = 1V (MAX811)
• Power-Supply Transient Immunity
●● Saves Board Space
• No External Components
• 4-Pin SOT143 Package
●● Low Power Consumption Simplifies Power-Supply
Requirements
• 6μA Supply Current
Ordering Information
PART*
TEMP RANGE PIN-PACKAGE
MAX811_EUS-T -40°C to +85°C 4 SOT143
MAX812_EUS-T -40°C to +85°C 4 SOT143
*This part offers a choice of five different reset threshold voltages.
Select the letter corresponding to the desired nominal reset
threshold voltage, and insert it into the blank to complete the
part number.
Devices are available in both leaded and lead(Pb)-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
RESET THRESHOLD
SUFFIX
VOLTAGE (V)
L
4.63
M
4.38
T
3.08
S
2.93
R
2.63
Pin Configuration
TOP VIEW
GND 1
MAX811
MAX812
4 VCC
(RESET) RESET 2
3 MR
( ) ARE FOR MAX812
SOT143
NOTE: SEE PACKAGE INFORMATION FOR MARKING INFORMATION.
19-0411; Rev 6; 5/18
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