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MAX6463XR16+T-MAX6466XR22+
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
VCCfalls below the internal VTH- and remains asserted
until VCCrises above VTH+ (VTH+ = VTH- ×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.
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
FeaturesUltra-Low 1.0µA Supply CurrentPreset Thresholds from +1.6V to +5.5V in 100mV
IncrementsInternal 5% Threshold Hysteresis±2.5% Threshold Accuracy Over TemperatureInternal Timeout Period Option (150ms min)Immune to Short Voltage TransientsNo External ComponentsAvailable in Three Output Options: Push-Pull
(Active Low/Active High) and Open Drain (Active
Low)Fully Specified from -40°C to +125°CSmall SC70 and SOT23 Packages
MAX6461–MAX6466
Ultra-Low-Power Voltage Detectors and
µP Supervisory Circuits
TOP VIEW
(OUT)/OUT
3VCC
GND
MAX6461–
MAX6466
SC70-3
GND
(OUT)/OUTGNDVCCN.C.
MAX6461–
MAX6466
SOT23-5
GND
3VCCMAX6461–
MAX6466
SOT23-3
(OUT)/OUT
( ) ARE FOR THE MAX6462/MAX6465 ONLY
Pin Configurations
Ordering Information
19-2533; Rev 2; 12/05
PARTTEMP RANGEPIN-PACKAGE
MAX6461XR_ _-T-40°C to +125°C3 SC70-3
MAX6461UR_ _-T-40°C to +125°C3 SOT23-3
MAX6461UK_ _-T-40°C to +125°C5 SOT23-5
MAX6462XR_ _-T-40°C to +125°C3 SC70-3
MAX6462UR_ _-T-40°C to +125°C3 SOT23-3
MAX6462UK_ _-T-40°C to +125°C5 SOT23-5
Ordering Information continued at end of data sheet.
Selector Guide appears at end of data sheet.
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.
MAX6461–MAX6466
Ultra-Low-Power Voltage Detectors and
µP Supervisory Circuits
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC= +1.2V to +6V, TA= -40°C to +125°C. Typical values are at TA= +25°C, unless otherwise noted.) (Note1)
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.
(All voltages referenced to GND unless otherwise noted.)
VCC, Open-Drain OUT..............................................-0.3V to +7V
Push-Pull OUT/OUT....................................-0.3V to (VCC+ 0.3V)
Input/Output Current (all pins)............................................20mA
Output Short Circuit (VCCor GND)
Continuous Power Dissipation (TA= +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
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
TA = 0°C to +125°C16Operating Voltage RangeVCCTA = -40°C to 0°C1.26.0V
VCC = 3.6V, TA = -40°C to +125°C,
no load, output not asserted12
VCC = 5.0V, TA = -40°C to +85°C,
no load, output not asserted1.32.5VCC Supply CurrentICC
VCC = 5.0V, TA = +85°C to +125°C,
no load, output not asserted3.5
VCC rising, TA = +25°C(VTH+)
× 0.985VTH+(VTH+)
× 1.015VTH+
VCC rising, TA = -40°C to +125°C(VTH+)
× 0.975
(VTH+)
× 1.025
VCC falling, TA = +25°C(VTH-)
× 0.985VTH-(VTH-)
× 1.015
Voltage Threshold
(Note 2)
VTH-
VCC falling, TA = -40°C to +125°C(VTH-)
× 0.975
(VTH-)
× 1.025
Voltage Threshold HysteresisVHYSTVHYST = [(VTH+) - (VTH-)] / (VTH-)] × 100%34.56%
VCC falling at 10mV/µs from
(VTH-) + 100mV to (V TH-) - 100mV17
Propagation DelaytPVCC rising at 10mV/µs
from (VTH+) - 100mV to
(VTH+) + 100mV
MAX6461/
MAX6462/
MAX6463 only
Startup Time
(MAX6461/MAX6462/MAX6463)225µs
Output Timeout Period
(MAX6464/MAX6465/MAX6466)tRP150260430ms
MAX6461–MAX6466
Ultra-Low-Power Voltage Detectors and
µP Supervisory Circuits
ELECTRICAL CHARACTERISTICS (continued)
(VCC= +1.2V to +6V, TA= -40°C to +125°C. Typical values are at TA= +25°C, unless otherwise noted.) (Note1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
VCC ≥ 1.2V, ISINK = 1.0mA, OUT asserted0.3
VCC ≥ 2.5V, ISINK = 4.0mA, OUT asserted0.3OUT Output Low (Open Drain or
Push-Pull)VOL
VCC ≥ 4.5V, ISINK = 9.0mA, OUT asserted0.4
VCC ≥ 1.8V, ISOURCE = 1.5mA,
OUT not asserted
0.8 ×
VCC
VCC ≥ 2.5V, ISOURCE = 3.0mA,
OUT not asserted
0.8 ×
VCCOUT Output High (Push-Pull)VOH
VCC ≥ 4.5V, ISOURCE = 8.0mA,
OUT not asserted
0.8 ×
VCC
OUT Output Open-Drain Leakage
CurrentILKGOUT not asserted, V OUT = +6V100nA
VCC ≥ 1.2V, ISOURCE = 200µA,
OUT asserted
0.8 ×
VCC
VCC ≥ 1.8V, ISOURCE = 1.5mA,
OUT asserted
0.8 ×
VCC
VCC ≥ 2.5V, ISOURCE = 3.0mA,
OUT asserted
0.8 ×
VCC
OUT Output High (Push-Pull)VOH
VCC ≥ 4.5V, ISOURCE = 8.0mA,
OUT asserted
0.8 ×
VCC
VCC ≥ 2.5V, ISINK = 4.0mA,
OUT not asserted0.3
OUT Output Low (Push-Pull)VOL
VCC ≥ 4.5V, ISINK = 9.0mA,
OUT not asserted0.4
Note 1:100% production testing done at +25°C. Limits over temperature are guaranteed by design.
Note 2:See Table 1 for VTH- and VTH+ values.
Typical Operating Characteristics
(VCC= 5V, TA= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
MAX6461 toc01
TEMPERATURE (°C)
SUPPLY CURRENT (
VCC = 5V, NO LOAD
PROPAGATION DELAY (RISING)
vs. TEMPERATURE
MAX6461 toc02
TEMPERATURE (°C)
PROPAGATION DELAY (
VCC RISING AT 200mV/μs FROM
((VTH+) - 100mV) TO ((VTH+) + 100mV)
PROPAGATION DELAY (FALLING)
vs. TEMPERATURE
MAX6461 toc03
TEMPERATURE (°C)
PROPAGATION DELAY (
VCC FALLING AT 200mV/μs FROM
((VTH-) + 100mV) TO ((VTH-) - 100mV)
MAX6461–MAX6466
Ultra-Low-Power Voltage Detectors and
µP Supervisory Circuits
Typical Operating Characteristics (continued)
(VCC= 5V, TA= +25°C, unless otherwise noted.)
MAXIMUM VCC TRANSIENT DURATION
vs. VTH- THRESHOLD OVERDRIVE
MAX6461 toc04
VTH- THRESHOLD OVERDRIVE ((VTH-) - VCC) (V)
TRANSIENT DURATION (
OUTPUT ASSERTS
ABOVE THIS LINE
MAX6464_ _22
PROPAGATION DELAY VCC RISING
MAX6461 toc05a
20μs/div
100mV/div
AC-COUPLED
1V/div
VCC
OUTACTIVE-HIGH
OUTPUT
MAX6462_ _16
PROPAGATION DELAY VCC FALLING
MAX6461 toc05b
10μs/div
100mV/div
AC-COUPLED
1V/div
VCC
OUTACTIVE-HIGH
OUTPUT
MAX6462_ _16
OUTPUT VOLTAGE HIGH
vs. SOURCE CURRENT
MAX6461 toc06a
SOURCE CURRENT (mA)
OUTPUT VOLTAGE (V)87654321
OUTPUT VOLTAGE HIGH
vs. SOURCE CURRENT
MAX6461 toc06b
SOURCE CURRENT (mA)
OUTPUT VOLTAGE (V)87654321
VCC = 3.3V
VTH = 2.9V
OUTPUT VOLTAGE LOW
vs. SINK CURRENT
MAX6461 toc07
SINK CURRENT (mA)
OUTPUT VOLTAGE (mV)86723451
VCC = 2.7V
VTH = 2.9V
NORMALIZED THRESHOLD
vs. TEMPERATURE
MAX6461 toc08
TEMPERATURE (°C)
NORMALIZED THRESHOLD
NORMALIZED OUTPUT TIMEOUT PERIOD
vs. TEMPERATURE
MAX6461 toc09
TEMPERATURE (°C)
NORMALIZED RESET TIMEOUT PERIOD
MAX6466
HYSTERESIS vs. TEMPERATURE
MAX6461 toc10
TEMPERATURE (°C)
% OF V
TH-
MAX6461
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 VCCfalls below the internal VTH- threshold,
the output is asserted and remains asserted until VCC
rises above VTH+ (VTH+ = VTH- ×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.
MAX6461–MAX6466
Ultra-Low-Power Voltage Detectors and
µP Supervisory Circuits
Pin Description
PIN
MAX6461–MAX6466
SOT23-3SC70-3SOT23-5
NAMEFUNCTION
OUT
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 (VCC) drops below the internal VTH- threshold and remains low
until the monitored input exceeds the internal VTH+ threshold. OUT is asserted
high when the monitored input (VCC) drops below the internal VTH- threshold and
remains high until the monitored input exceeds the internal VTH+ 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.124
OUT
OUT is asserted low when the monitored input (VCC) drops below the internal
VTH- threshold and remains low for at least 150ms after the monitored input
exceeds the internal VTH+ threshold. OUT is asserted high when the monitored
input (VCC) drops below the internal VTH- threshold and remains high for at least
150ms after the monitored input exceeds the internal VTH+ threshold. The open-
drain output OUT requires an external pullup resistor.2, 3GNDGround. In the SOT23-5 package, both pins must be grounded.5VCCSupply Voltage and Monitored Voltage Input1N.C.No Connection
RESET
TIMEOUT
OUTPUT
STAGE
1.23V
VCC
OUT
MAX6461–
MAX6466
Functional Diagram
MAX6461–MAX6466
Applications Information
Interfacing to Different Logic Voltage
Components
The MAX6463 and MAX6466’s active-low, open-drain out-
put versions can be used to interface with a different logic
voltage than VCC, as shown in Figure 1. This output struc-
ture sinks current when OUTis asserted. Connect a
pullup resistor from OUTto any supply from 0 to 6V.
Select a resistor value large enough to allow a valid logic
low (see the Electrical Characteristics) and small enough
to register a logic high while supplying all input current
and leakage paths connected to the OUTpin.
Hysteresis
The MAX6461–MAX6466 feature internal hysteresis that
creates two trip points: one for rising supply voltage
and one for falling supply voltage. The hysteresis pre-
vents the output from oscillating (chattering) when VCC
is near the voltage threshold.
Transients Immunity
These devices are relatively immune to short-duration
and falling VCCtransients (glitches). The Typical
Operating Characteristicsshow the Maximum Transient
Duration vs. Threshold Overdrive graph, for which OUT
is not asserted. The graph shows the maximum pulse
width that a falling VCCtransient typically might have
before the devices are asserted. As the amplitude of
the transient increases, the maximum allowable pulse
width decreases.
Ensuring Valid Output Down to 0V
When VCCfalls below 1V, the MAX6461/MAX6464 out-
put sinking capability is reduced. Therefore, high-
impedance CMOS logic inputs connected to OUTcan
drift to undetermined voltages. This presents no prob-
lem in most applications, because most circuitry is
inoperative when VCCis below 1V. In applications
where OUTmust be valid down to ground, add a pull-
down resistor to ground so any stray leakage currents
flow to ground, holding OUTlow. Select a resistor large
enough not to load OUTand small enough to pull OUT
to ground. For most applications, 100kΩdoes not load
OUTand pulls OUTto ground.
Ultra-Low-Power Voltage Detectors and
µP Supervisory Circuits
DC/DC
CONVERTER
OUT
MAX6463
MAX6466
SUSPEND
VCC
OUTIN
VCC3.6V
Li+
Figure 1. Interfacing to Different Logic Voltage Components

Partno	Mfg	Dc	Qty	Available	Descript
MAX6463XR16+T	MAXIM	N/a	2500	avai	Ultra-Low-Power Voltage Detectors and µP Supervisory Circuits
MAX6466XR22+ \|MAX6466XR22	MAX	N/a	2500	avai	Ultra-Low-Power Voltage Detectors and µP Supervisory Circuits