19-2533; Rev 2; 12/05
Ultra-Low-Power Voltage Detectors and
µP Supervisory Circuits
General Description
The MAX6461–MAX6466 family of ultra-low-power voltage
detectors and µP reset supervisory circuits monitors bat-
tery, power-supply, and system voltages. Each circuit
includes a precision bandgap reference, a comparator,
internally trimmed resistor networks that set specified trip
thresholds, and an internal 5% threshold hysteresis circuit
(see the
Functional Diagram).
Output is asserted when
V
CC
falls below the internal V
TH-
and remains asserted
until V
CC
rises above V
TH
+ (V
TH
+ = V
TH
-
×
1.05). These
devices provide excellent circuit reliability and low cost
by eliminating external components and adjustments
when monitoring nominal system voltages from +1.6V to
+5.5V. The MAX6461/MAX6462/MAX6463 are voltage
detectors with a propagation delay of 17µs.
The MAX6464/MAX6465/MAX6466 are µP supervisory
circuits with a minimum reset timeout period of 150ms. All
devices are available with thresholds from +1.6V to +5.5V
in 100mV increments.
The family is available with three output stage options:
push-pull with active-low output, push-pull with active-
high output, and open drain with active-low output. These
devices are available in SC70 and SOT23 packages
specified over the -40°C to +125°C temperature range.
♦
Ultra-Low 1.0µA Supply Current
♦
Preset Thresholds from +1.6V to +5.5V in 100mV
Increments
♦
Internal 5% Threshold Hysteresis
♦
±2.5% Threshold Accuracy Over Temperature
♦
Internal Timeout Period Option (150ms min)
♦
Immune to Short Voltage Transients
♦
No External Components
♦
Available in Three Output Options: Push-Pull
(Active Low/Active High) and Open Drain (Active
Low)
♦
Fully Specified from -40°C to +125°C
♦
Small SC70 and SOT23 Packages
Features
MAX6461–MAX6466
Ordering Information
PART
MAX6461XR_
_-T
MAX6461UR_ _-T
MAX6461UK_ _-T
MAX6462XR_
_-T
MAX6462UR_ _-T
MAX6462UK_ _-T
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
3 SC70-3
3 SOT23-3
5 SOT23-5
3 SC70-3
3 SOT23-3
5 SOT23-5
Applications
Precision Battery Monitoring
Load Switching/Power Sequencing
Power-Supply Monitoring in Digital/Analog
Systems
Noise-Immune µP Reset Circuits
Portable/Battery-Powered Equipment
Cellular Phones/Cordless Phones
PDAs
Portable Medical Devices
The MAX6461–MAX6466 are available in factory-set thresholds
from 1.6V to 5.5V in approximately 100mV increments. Choose
the desired voltage threshold suffix from Table 1 and insert it in
the blank spaces in the part number. There are 30 standard ver-
sions with a required order increment of 2500 pieces. Sample
stock generally is held on the standard versions only (Table 2).
Nonstandard versions require a 10k-piece order increment.
Contact factory for availability. All devices available in tape-and-
reel only.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
Ordering Information continued at end of data sheet.
Selector Guide appears at end of data sheet.
Pin Configurations
TOP VIEW
GND 1
N.C.
1
5
V
CC
(OUT)/OUT 1
MAX6461–
MAX6466
(OUT)/OUT 2
3
V
CC
GND 2
MAX6461–
MAX6466
GND 2
4
(OUT)/OUT
MAX6461–
MAX6466
3
V
CC
SC70-3
( ) ARE FOR THE MAX6462/MAX6465 ONLY
GND 3
SOT23-3
SOT23-5
________________________________________________________________
Maxim Integrated Products
1
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.
Ultra-Low-Power Voltage Detectors and
µP Supervisory Circuits
MAX6461–MAX6466
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND unless otherwise noted.)
V
CC
, Open-Drain OUT..............................................-0.3V to +7V
Push-Pull OUT/OUT....................................-0.3V
to (V
CC
+ 0.3V)
Input/Output Current (all pins) ............................................20mA
Output Short Circuit (V
CC
or GND)
Continuous Power Dissipation (T
A
= +70°C)
3-Pin SC70 (derate 2.9mW/°C above +70°C) ...........228.6mW
3-Pin SOT23 (derate 4.0mW/°C above +70°C)............320mW
5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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.
ELECTRICAL CHARACTERISTICS
(V
CC
= +1.2V to +6V, T
A
= -40°C to +125°C. Typical values are at T
A
= +25°C, unless otherwise noted.) (Note1)
PARAMETER
Operating Voltage Range
SYMBOL
V
CC
CONDITIONS
T
A
= 0°C to +125°C
T
A
= -40°C to 0°C
V
CC
= 3.6V, T
A
= -40°C to +125°C,
no load, output not asserted
V
CC
Supply Current
I
CC
V
CC
= 5.0V, T
A
= -40°C to +85°C,
no load, output not asserted
V
CC
= 5.0V, T
A
= +85°C to +125°C,
no load, output not asserted
V
CC
rising, T
A
= +25°C
V
TH
+
Voltage Threshold
(Note 2)
V
TH
-
V
CC
falling, T
A
= -40°C to +125°C
Voltage Threshold Hysteresis
V
HYST
V
HYST
= [(V
TH
+) - (V
TH
-)] / (V
TH
-)]
×
100%
V
CC
falling at 10mV/µs from
(V
TH
-) + 100mV to (V
TH
-) - 100mV
Propagation Delay
t
P
V
CC
rising at 10mV/µs
from (V
TH
+) - 100mV to
(V
TH
+) + 100mV
MAX6461/
MAX6462/
MAX6463 only
V
CC
rising, T
A
= -40°C to +125°C
V
CC
falling, T
A
= +25°C
(V
TH
+)
×
0.985
(V
TH
+)
×
0.975
(V
TH
-)
×
0.985
(V
TH
-)
×
0.975
3
4.5
17
µs
100
V
TH
-
V
TH
+
MIN
1
1.2
1
1.3
TYP
MAX
6
6.0
2
2.5
3.5
(V
TH
+)
×
1.015
(V
TH
+)
×
1.025
(V
TH
-)
×
1.015
(V
TH
-)
×
1.025
6
%
µA
UNITS
V
V
Startup Time
(MAX6461/MAX6462/MAX6463)
Output Timeout Period
(MAX6464/MAX6465/MAX6466)
t
RP
150
225
260
430
µs
ms
2
_______________________________________________________________________________________
Ultra-Low-Power Voltage Detectors and
µP Supervisory Circuits
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +1.2V to +6V, T
A
= -40°C to +125°C. Typical values are at T
A
= +25°C, unless otherwise noted.) (Note1)
PARAMETER
OUT
Output Low (Open Drain or
Push-Pull)
SYMBOL
V
OL
CONDITIONS
V
CC
≥
1.2V, I
SINK
= 1.0mA,
OUT
asserted
V
CC
≥
2.5V, I
SINK
= 4.0mA,
OUT
asserted
V
CC
≥
4.5V, I
SINK
= 9.0mA,
OUT
asserted
V
CC
≥
1.8V, I
SOURCE
= 1.5mA,
OUT
not asserted
OUT
Output High (Push-Pull)
V
OH
V
CC
≥
2.5V, I
SOURCE
= 3.0mA,
OUT
not asserted
V
CC
≥
4.5V, I
SOURCE
= 8.0mA,
OUT
not asserted
OUT
Output Open-Drain Leakage
Current
I
LKG
OUT
not asserted, V
OUT
= +6V
V
CC
≥
1.2V, I
SOURCE
= 200µA,
OUT asserted
V
CC
≥
1.8V, I
SOURCE
= 1.5mA,
OUT asserted
OUT Output High (Push-Pull)
V
OH
V
CC
≥
2.5V, I
SOURCE
= 3.0mA,
OUT asserted
V
CC
≥
4.5V, I
SOURCE
= 8.0mA,
OUT asserted
V
CC
≥
2.5V, I
SINK
= 4.0mA,
OUT not asserted
OUT Output Low (Push-Pull)
V
OL
V
CC
≥
4.5V, I
SINK
= 9.0mA,
OUT not asserted
0.8
×
V
CC
0.8
×
V
CC
0.8
×
V
CC
0.8
×
V
CC
0.3
V
0.4
0.8
×
V
CC
0.8
×
V
CC
0.8
×
V
CC
100
nA
V
MIN
TYP
MAX
0.3
0.3
0.4
V
UNITS
MAX6461–MAX6466
V
Note 1:
100% production testing done at +25°C. Limits over temperature are guaranteed by design.
Note 2:
See Table 1 for V
TH
- and V
TH
+ values.
Typical Operating Characteristics
(V
CC
= 5V, T
A
= +25°C, unless otherwise noted.)
PROPAGATION DELAY (RISING)
vs. TEMPERATURE
MAX6461 toc01
MAX6461 toc02
SUPPLY CURRENT vs. TEMPERATURE
1.45
V
CC
= 5V, NO LOAD
1.40
SUPPLY CURRENT (µA)
1.35
1.30
1.25
1.20
1.15
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
120
110
PROPAGATION DELAY (µs)
100
90
80
70
60
PROPAGATION DELAY (FALLING)
vs. TEMPERATURE
35
PROPAGATION DELAY (µs)
30
25
20
15
10
5
0
V
CC
FALLING AT 200mV/µs FROM
((V
TH
-) + 100mV) TO ((V
TH
-) - 100mV)
MAX6461 toc03
V
CC
RISING AT 200mV/µs FROM
((V
TH
+) - 100mV) TO ((V
TH
+) + 100mV)
40
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
_______________________________________________________________________________________
3
Ultra-Low-Power Voltage Detectors and
µP Supervisory Circuits
MAX6461–MAX6466
Typical Operating Characteristics (continued)
(V
CC
= 5V, T
A
= +25°C, unless otherwise noted.)
MAXIMUM V
CC
TRANSIENT DURATION
vs. V
TH-
THRESHOLD OVERDRIVE
19
TRANSIENT DURATION (µs)
18
17
16
15
14
13
12
11
10
0.01
0.1
1
V
TH-
THRESHOLD OVERDRIVE ((V
TH-
) - V
CC
) (V)
MAX6464_ _22
OUTPUT ASSERTS
ABOVE THIS LINE
MAX6461 toc04
PROPAGATION DELAY V
CC
RISING
MAX6461 toc05a
PROPAGATION DELAY V
CC
FALLING
MAX6461 toc05b
20
100mV/div
AC-COUPLED
V
CC
100mV/div
AC-COUPLED
V
CC
1V/div
ACTIVE-HIGH
OUTPUT
MAX6462_ _16
20µs/div
OUT
1V/div
ACTIVE-HIGH
OUTPUT
OUT
MAX6462_ _16
10µs/div
OUTPUT VOLTAGE HIGH
vs. SOURCE CURRENT
MAX6461 toc06a
OUTPUT VOLTAGE HIGH
vs. SOURCE CURRENT
MAX6461 toc06b
OUTPUT VOLTAGE LOW
vs. SINK CURRENT
V
CC
= 2.7V
V
TH
= 2.9V
MAX6461 toc07
6.0
3.5
V
CC
= 3.3V
V
TH
= 2.9V
3.3
OUTPUT VOLTAGE (V)
300
275
250
OUTPUT VOLTAGE (mV)
225
200
175
150
125
100
75
50
25
0
0
OUTPUT VOLTAGE (V)
5.5
3.1
5.0
2.9
4.5
2.7
4.0
0
1
2
3
4
5
6
7
8
9
10
SOURCE CURRENT (mA)
2.5
0
1
2
3
4
5
6
7
8
9
10
SOURCE CURRENT (mA)
1
2
3
4
5
6
7
8
9
10
SINK CURRENT (mA)
NORMALIZED THRESHOLD
vs. TEMPERATURE
MAX6461 toc08
NORMALIZED OUTPUT TIMEOUT PERIOD
vs. TEMPERATURE
MAX6461 toc09
HYSTERESIS vs. TEMPERATURE
MAX6461
5.5
% OF V
TH-
MAX6461 toc10
1.02
1.02
NORMALIZED RESET TIMEOUT PERIOD
MAX6466
1.01
6.0
NORMALIZED THRESHOLD
1.01
1.00
1.00
5.0
0.99
0.99
4.5
0.98
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
0.98
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
4.0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
4
_______________________________________________________________________________________
Ultra-Low-Power Voltage Detectors and
µP Supervisory Circuits
Pin Description
PIN
MAX6461–MAX6466
SOT23-3
SC70-3
SOT23-5
Detector Output for the MAX6461/MAX6462/MAX6463: Push-pull (active-low or
active-high) and open-drain (active-low) options.
OUT
is asserted low when the
monitored input (V
CC
) drops below the internal V
TH-
threshold and remains low
until the monitored input exceeds the internal V
TH+
threshold. OUT is asserted
high when the monitored input (V
CC
) drops below the internal V
TH-
threshold and
remains high until the monitored input exceeds the internal V
TH+
threshold. The
open-drain output
OUT
requires an external pullup resistor. Output for the
MAX6464/MAX6465/MAX6466: Push-pull (active-low or active-high) and open-
drain (active-low) options.
OUT
is asserted low when the monitored input (V
CC
) drops below the internal
V
TH-
threshold and remains low for at least 150ms after the monitored input
exceeds the internal V
TH+
threshold. OUT is asserted high when the monitored
input (V
CC
) drops below the internal V
TH-
threshold and remains high for at least
150ms after the monitored input exceeds the internal V
TH+
threshold. The open-
drain output
OUT
requires an external pullup resistor.
Ground. In the SOT23-5 package, both pins must be grounded.
Supply Voltage and Monitored Voltage Input
No Connection
NAME
FUNCTION
MAX6461–MAX6466
OUT
1
2
4
OUT
2
3
—
1
3
—
2, 3
5
1
GND
V
CC
N.C.
Functional Diagram
V
CC
Detailed Description
The MAX6461/MAX6462/MAX6463 voltage detectors
and the MAX6464/MAX6465/MAX6466 µP reset supervi-
sory circuits monitor battery, power-supply, and system
voltages from +1.6V to +5.5V. These devices consume
only 1µA of supply current with a 3.6V supply voltage.
Whenever V
CC
falls below the internal V
TH
- threshold,
the output is asserted and remains asserted until V
CC
rises above V
TH+
(V
TH+
= V
TH
-
×
1.05). All devices have
±2.5%
threshold accuracy over temperature and offer
protection to short voltage transients. These devices are
ideal for low-cost and space-critical applications
because they do not require external components for
proper operation.
R1
MAX6461–
MAX6466
R2
RESET
TIMEOUT
OUTPUT
STAGE
OUT
R3
1.23V
_______________________________________________________________________________________
5
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