MAX811 Datasheet PDF


Part Number

MAX811

Description

4-Pin uP Voltage Monitors

Manufacture

Maxim

Total Page 9 Pages
PDF Download
Download MAX811 Datasheet PDF


Features Datasheet pdf MAX811/MAX812 4-Pin μP Voltage Monitor s with Manual Reset Input General Desc ription The MAX811/MAX812 are low-power microprocessor (µP) supervisory circu its used to monitor power supplies in P and digital systems. They provide ex cellent circuit reliability and low cos t by eliminating external components an d adjustments when used with 5Vpowered or 3V-powered circuits. The MAX811/MAX8 12 also provide a debounced manual rese t input. These devices perform a single function: They assert a reset signal w henever the VCC supply voltage falls be low a preset threshold, keeping it asse rted for at least 140ms after VCC has r isen above the reset threshold. The onl y difference between the two devices is.
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MAX811 Datasheet
MAX811/MAX812
4-Pin μP Voltage Monitors
with Manual Reset Input
General Description
The MAX811/MAX812 are low-power microprocessor
(µP) supervisory circuits used to monitor power sup-
plies in µP and digital systems. They provide excellent
circuit reliability and low cost by eliminating external
components and adjustments when used with 5V-
powered 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 thresh-
old. 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 out-
put. 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
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
SOT143
( ) ARE FOR MAX812
NOTE: SEE PACKAGE INFORMATION FOR MARKING INFORMATION.
19-0411; Rev 5; 6/15




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