MAX812MEUS View Datasheet(PDF) - Tiger Electronic
Part Name
Description
Manufacturer
MAX812MEUS Datasheet PDF : 8 Pages
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TIGER ELECTRONIC CO.,LTD
MAX811 / 812
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
Features
Precision Monitoring of 3V, 3.3V, and 5V
Power-Supply Voltages
6µA Supply Current
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
No External Components
4-Pin SOT143 Package
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.
RESET THRESHOLD
SUFFIX
VOLTAGE (V)
L
4.63
M
4.38
T
3.08
S
2.93
R
2.63
Pin Configuration
VCC
VCC
MAX811
MAX812
RESET
MR
(RESET)
GND
PUSHBUTTON
SWITCH
VCC
P
RESET
INPUT
GND
( ) ARE FOR MAX812
TOP VIEW
GND 1
MAX811
MAX812
4 VCC
(RESET) RESET 2
3 MR
SOT143
( ) ARE FOR MAX812
NOTE: SEELAST PAGE FOR MARKING INFORMATION.
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