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MAX811LEUS+T

P1-P3P4-P6P7-P8
________________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 V
CC
supply voltage falls
below a preset threshold, keeping it asserted for at
least 140ms after V
CC
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 V
CC
down to
1V), while the MAX812 has an active-high RESET out-
put. The reset comparator is designed to ignore fast
transients on V
CC
. 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;
RREESSEETT
Output (MAX811), RESET Output (MAX812)
♦♦
Guaranteed Over Temperature
♦♦
Guaranteed
RREESSEETT
Valid to V
CC
= 1V (MAX811)
♦♦
Power-Supply Transient Immunity
♦♦
No External Components
♦♦
4-Pin SOT143 Package
MAX811/MAX812
4-Pin µP Voltage Monitors
with Manual Reset Input
________________________________________________________________
Maxim Integrated Products
1
1
2
4
3
V
CC
MR(RESET) RESET
GND
MAX811
MAX812
SOT143
TOP VIEW
( ) ARE FOR MAX812
NOTE: SEE LAST PAGE FOR MARKING INFORMATION.
___________________Pin Configuration
MAX811
MAX812
V
CC
V
CC
RESET
(RESET)
RESET
INPUT
GND
V
CC
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.
MAX811/MAX812
4-Pin µP Voltage Monitors
with Manual Reset Input
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= 5V for L/M versions, V
CC
= 3.3V for T/S versions, V
CC
= 3V for R version, T
A
= -40°C to +85°C, unless otherwise noted.
Typical values are at T
A
= +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Terminal Voltage (with respect to GND)
V
CC
......................................................................-0.3V to 6.0V
All Other Inputs.......................................-0.3V to (V
CC
+ 0.3V)
Input Current, V
CC,
MR .......................................................20mA
Output Current, RESET or RESET .......................................20mA
Continuous Power Dissipation (T
A
= +70°C)
SOT143 (derate 4mW/°C above +70°C) .......................320mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
I
SOURCE
= 150µA, 1.8V < V
CC
< V
TH(MIN)
MAX81_R/S/T, V
CC
= 3.6V, I
OUT
= 0
MAX81_L/M, V
CC
= 5.5V, I
OUT
= 0
T
A
= -40°C to +85°C
V
OD
= 125mV, MAX81_R/S/T
V
OD
= 125mV, MAX81_L/M
MAX81_S
MAX81_L
MAX81_M
V
CC
= V
TH(MAX)
CONDITIONS
0.8 x V
CC
2.3V
IH
µs0.5t
MD
MR to Reset Propagation Delay
(Note 2)
ns100
MR Glitch Immunity (Note 3)
µs10t
MR
MR Minimum Pulse Width
ms140 560t
RP
Reset Active Timeout Period
µA
2.7 10
I
CC
Supply Current
615
V
1.2
V
CC
Operating Voltage Range
µs
20
V
CC
to Reset Delay (Note 2)
40
2.88 2.93 2.98
3.03 3.08 3.14
Reset Threshold
4.54 4.63 4.72
4.50 4.75
4.30 4.38 4.46
4.25 4.50
UNITSMIN TYP MAXSYMBOLPARAMETER
MAX812L/M only, I
SINK
= 3.2mA,
V
CC
= V
TH(MAX)
MAX812R/S/T only, I
SINK
= 1.2mA,
V
CC
= V
TH(MAX)
V
0.4
V
OL
RESET Output Voltage
(MAX812)
0.3
V
OH
V
CC
> V
TH(MAX)
, MAX81_L/M
0.8V
IL
V
CC
> V
TH(MAX)
, MAX81_R/S/T
V
0.25 x V
CC
V
IL
MR Input Threshold
0.7 x V
CC
V
IH
kΩ10 20 30
MR Pull-Up Resistance
T
A
= 0°C to +70°C 1.0 5.5
3.00 3.15
2.85 3.00
ppm/°C30Reset Threshold Tempco
MAX81_R
2.58 2.63 2.68
2.55 2.70
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
MAX81_T
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
V
TH
V
MAX811/MAX812
4-Pin µP Voltage Monitors
with Manual Reset Input
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 5V for L/M versions, V
CC
= 3.3V for T/S versions, V
CC
= 3V for R version, T
A
= -40°C to +85°C, unless otherwise noted.
Typical values are at T
A
= +25°C.) (Note 1)
Note 1: Production testing done at T
A
= +25°C, over temperature limits guaranteed by design using six sigma design limits.
Note 2: RESET output for MAX811, RESET output for MAX812.
Note 3: “Glitches” of 100ns or less typically will not generate a reset pulse.
MAX811R/S/T only, I
SINK
= 1.2mA,
V
CC
= V
TH(MIN)
MAX811L/M only, I
SOURCE
= 800µA,
V
CC
> V
TH(MAX)
MAX811L/M only, I
SINK
= 3.2mA,
V
CC
= V
TH(MIN)
I
SINK
= 50µA, V
CC
> 1.0V
MAX811R/S/T only, I
SOURCE
= 500µA,
V
CC
> V
TH(MAX)
CONDITIONS
0.3
V
V
CC
- 1.5
V
OH
RESET Output Voltage
(MAX811)
0.4
0.3
V
OL
0.8 x V
CC
UNITSMIN TYP MAXSYMBOLPARAMETER
P1-P3P4-P6P7-P8

MAX811LEUS+T

Mfr. #:
Buy MAX811LEUS+T
Manufacturer:
Maxim Integrated
Description:
Supervisory Circuits 4-Pin uPower Voltage Monitor
Lifecycle:
New from this manufacturer.
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