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MAX812LEUS Datasheet(PDF) 1 Page - Maxim Integrated Products

Part No. MAX812LEUS
Description  4-Pin uP Voltage Monitors with Manual Reset Input
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX812LEUS Datasheet(HTML) 1 Page - Maxim Integrated Products

   
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________________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
____________________________Features
♦♦ Precision Monitoring of 3V, 3.3V, and 5V
Power-Supply Voltages
♦♦ 6µA Supply Current
♦♦ 140ms Min Power-On Reset Pulse Width;
R
RE
ES
SE
ET
T Output (MAX811), RESET Output (MAX812)
♦♦ Guaranteed Over Temperature
♦♦ Guaranteed R
RE
ES
SE
ET
T Valid to VCC = 1V (MAX811)
♦♦ Power-Supply Transient Immunity
♦♦ No External Components
♦♦ 4-Pin SOT143 Package
4-Pin µP Voltage Monitors
with Manual Reset Input
________________________________________________________________
Maxim Integrated Products
1
1
2
4
3
VCC
MR
(RESET) RESET
GND
MAX811
MAX812
SOT143
TOP VIEW
( ) ARE FOR MAX812
NOTE: SEE LAST PAGE FOR MARKING INFORMATION.
___________________Pin Configuration
MAX811
MAX812
VCC
VCC
RESET
(RESET)
RESET
INPUT
GND
VCC
GND
μP
( ) ARE FOR MAX812
PUSHBUTTON
SWITCH
MR
___________Typical Operating Circuit
19-0411; Rev 4; 12/05
PART*
MAX811_EUS-T
MAX812_EUS-T
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
PIN-PACKAGE
4 SOT143
4 SOT143
_______________Ordering Information
*
This part offers a choice of five different reset threshold volt-
ages. 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-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
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.


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