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MAX6361HUT44+-MAX6361LUT26-MAX6363HUT46-MAX6364PUT
SOT23, Low-Power レP Supervisory Circuits with Battery Backup
General DescriptionThe MAX6361/MAX6363/MAX6364 supervisory circuits
reduce the complexity and number of components
required for power-supply monitoring and battery control
functions in microprocessor (µP) systems. The circuits sig-
nificantly improve system reliability and accuracy com-
pared to that obtainable with separate ICs or discrete
components. Their functions include µP reset, backup-
battery switchover, and power failure warning.
The MAX6361/MAX6363/MAX6364 operate from supply
voltages as low as +1.2V. The factory preset reset
threshold voltage ranges from 2.32V to 4.63V (see
Ordering Information). These devices provide a manual
reset input (MAX6361), battery-on output (MAX6363),
and an auxiliary adjustable reset input (MAX6364). In
addition, each part type is offered in three reset output
versions: an active-low push-pull reset, an active-low
open-drain reset, and an active-high push-pull reset
(see Selector Guide at end of data sheet).
Applications
FeaturesLow +1.2V Operating Supply Voltage
(VCCor VBATT)Precision Monitoring of +5.0V, +3.3V, +3.0V, and
+2.5V Power-Supply VoltagesDebounced Manual Reset Input (MAX6361)Battery-On Output Indicator (MAX6363)Auxiliary User-Adjustable RESET IN (MAX6364)Three Available Output Structures
Push-Pull RESET, Open-Drain RESET,
Push-Pull RESETRESET/RESET Valid Down to 1.2V Guaranteed
(VCCor VBATT)Power-Supply Transient Immunity150ms (min) Reset Timeout PeriodSmall 6-Pin SOT23 Package
MAX6361/MAX6363/MAX6364
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup19-1615; Rev 0; 1/00
Ordering Information
Pin Configurations
Note:These parts offer a choice of reset threshold voltages.
From Table 1, select the suffix corresponding to the desired
thresholdvoltage and insert it into the part number to complete
it. When ordering from the factory, there is a 2500-piece mini-
mum on the SOT package (tape-and-reel only).
Selector Guide appears at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
MAX6361/MAX6363/MAX6364
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= +2.4V to +5.5V, VBATT= 3V, TA= -40°C to +85°C, reset not asserted, typical values are at TA= +25°C, unless otherwise
noted.) (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 Voltages (with respect to GND)
VCC, BATT, OUT...................................................-0.3V to +6V
RESET(open drain)..............................................-0.3V to +6V
BATT ON, MR, RESET IN.....................-0.3V to (VOUT+ 0.3V)
RESET, RESET......................................-0.3V to (VOUT+ 0.3V)
Input Current
VCCPeak ............................................................................1A
VCCContinuous............................................................250mA
BATT Peak....................................................................250mA
BATT Continuous............................................................40mA
GND................................................................................75mA
Output Current
OUT................................Short-Circuit Protection for up to 10s
RESET, RESET, BATT ON ..............................................20mA
Continuous Power Dissipation (TA= +70°C)
6-Pin SOT23 (derate 8.70mW/°C above +70°C) .........696mW
Operating Temperature Range
MAX636_.........................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
MAX6361/MAX6363/MAX6364
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
ELECTRICAL CHARACTERISTICS (continued)(VCC= +2.4V to +5.5V, VBATT= 3V, TA= -40°C to +85°C, reset not asserted, typical values are at TA= +25°C, unless otherwise
noted.) (Note 1)
Note 1:Overtemperature limits are guaranteed by design and not production tested.
Note 2:VBATTcan be 0 anytime or VCCcan go down to 0 if VBATTis active (except at startup).
MAX6361/MAX6363/MAX6364
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
Typical Operating Characteristics(TA= +25°C, unless otherwise noted.)
MAX6361/MAX6363/MAX6364
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
Typical Operating Characteristics (continued)(TA= +25°C, unless otherwise noted.)
Pin Description
Detailed DescriptionThe Typical Operating Circuitshows a typical connec-
tion for the MAX6361/MAX6363/MAX6364 family. OUT
powers the static random-access memory (SRAM). OUT
is internally connected to VCCif VCCis greater than the
reset threshold, or to the greater of VCCor VBATTwhen
to 150mA from VCC. When VCCis higher than VBATT, the
BATT ON (MAX6363) output is low. When VCCis lower
than VBATT, an internal MOSFET connects the backup
battery to OUT. The on-resistance of the MOSFET is a
function of backup-battery voltage and is shown in the
Battery to Out On-Resistance vs. Temperature graph in
the Typical Operating Characteristicssection.
MAX6361/MAX6363/MAX6364
Backup-Battery Switchover In a brownout or power failure, it may be necessary to
preserve the contents of the RAM. With a backup bat-
tery installed at BATT, the MAX6361/MAX6363/
MAX6364 automatically switch the RAM to backup
power when VCCfalls. The MAX6363 has a BATT ON
output that goes high when in battery-backup mode.
These devices require two conditions before switching
to battery-backup mode: VCCmust be below the reset threshold.VCCmust be below VBATT. Table 2 lists the status
of the inputs and outputs in battery-backup mode.
The device will not power up if the only voltage
source is on BATT. OUT will only power up from
VCCat startup.
Manual Reset Input (MAX6361 only)Many µP-based products require manual reset capabili-
ty, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. For the MAX6361, a logic
low on MRasserts reset. Reset remains asserted whileis low, and for a minimum of 150ms (tRP) after it
returns high. MRhas an internal 20kΩpull-up resistor.
This input can be driven with TTL/CMOS logic levels or
with open-drain/collector outputs. Connect a normally
open momentary switch from MRto GND to create a
manual reset function; external debounce circuitry is not
required. If MRis driven from long cables or the device
is used in a noisy environment, connect a 0.1µF capaci-
tor from MRto GND to provide additional noise immunity.
Reset In (MAX6364 only)RESET IN is compared to an internal 1.235V reference.
If the voltage at RESET IN is less than 1.235V, reset is
asserted. The RESET IN comparator may be used as
an undervoltage detector to signal a failing power sup-
ply. It can also be used as a secondary power-supply
reset monitor.
Reset OutputA µP’s reset input starts the µP in a known state. The
MAX6361/MAX6363/MAX6364 µP supervisory circuits
assert a reset to prevent code-execution errors during
power-up, power-down, and brownout conditions.
RESET is guaranteed to be a logic low or high depend-
ing on the device chosen (see Ordering Information).
RESET or RESETasserts when VCCis below the reset
threshold and for at least 150ms (tRP) after VCCrises
above the reset threshold. RESET or RESETalso
asserts when MRis low (MAX6361) and when RESET
IN is less than 1.235V (MAX6364).
Applications Information
Operation Without a Backup
Power SourceThe MAX6361/MAX6363/MAX6364 were designed for
battery-backed applications. If a backup battery is not
used, connect VCCto OUT and connect BATT to GND.
Replacing the Backup BatteryIf BATT is decoupled with a 0.1µF capacitor to ground,
the backup power source can be removed while VCC
remains valid without danger of triggering a reset pulse.
The device does not enter battery-backup mode when
VCCstays above the reset threshold voltage.
Negative-Going VCCTransientsThese supervisors are relatively immune to short-dura-
tion, negative-going VCCtransients. Resetting the µP
when VCCexperiences only small glitches is usually not
desirable.
The Typical Operating Characteristicssection shows a
graph of Maximum Transient Duration vs. Reset
Threshold Overdrive for which reset is not asserted.
The graph was produced using negative-going VCC
pulses, starting at VCCand ending below the reset
threshold by the magnitude indicated (reset threshold
overdrive). The graph shows the maximum pulse width
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
