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MAX6455UT16S+T-MAX6456UT29S+T
µP Supervisors with Separate VCC Reset and Manual Reset Outputs
General DescriptionThe MAX6453–MAX6456 are low-power, dual-voltage
µP supervisors featuring separate VCC reset and manu-
al reset outputs. The dual outputs support both soft-
system reset (interrupt) and hard-system reset (reboot)
functions. The reset output asserts when any of the
monitored voltages falls below its specified threshold
and remains asserted for the reset timeout (140ms min)
after all voltages exceed their respective reset thres-
holds. All devices are offered with nine factory-fixed
reset thresholds for monitoring primary system voltages
(VCC) from 1.8V to 5V and an adjustable reset input for
monitoring a secondary system voltage down to 0.63V.
Each device has a manual reset input, a VCC reset out-
put, and a manual reset output. The MAX6453/MAX6454
manual reset output asserts when the manual reset input
is low. It remains asserted for the manual reset timeout
period (140ms min) after the manual reset input transi-
tions high. The MAX6453/MAX6454 manual reset input
controls only the manual reset output and does not affect
the VCC reset output.
The manual reset input of the MAX6455/MAX6456 con-
trols both the manual reset and VCC reset outputs. When
the manual reset input is low for less than the extended
setup timeout period, only the manual reset output asserts
and remains asserted for the manual reset timeout period
(140ms min) after the manual reset input transitions high.
If the manual reset input is low for at least the extended
setup timeout period, the reset output also asserts and
remains asserted for the reset timeout period (140ms
min) after the manual reset input transitions high. This
enhanced feature allows the implementation of a soft/
hard-system reset combination.
The MAX6453/MAX6455 have active-low, push-pull
reset and manual reset outputs, and the MAX6454/
MAX6456 have active-low, open-drain reset and manu-
al reset outputs. All devices are available in small
SOT23-6 packages and are fully specified over the
extended temperature range (-40°C to +85°C).
Applications●Set-Top Boxes ●Consumer Electronics●DVD Players●Cable/DSL Modems●MP3 Players●Industrial Equipment●Medical Devices
Features●Precision Factory-Set Reset Thresholds From
1.6V to 4.6V●Adjustable Threshold to Monitor Voltages Down
to 0.63V●Manual Reset Input with Extended Setup Period●Immune to Short Voltage Transients●Low 6µA Supply Current●Guaranteed Valid Reset Down to VCC = 1.0V●Active-Low RESET (Push-Pull or Open-Drain)●Outputs●140ms (min) Reset Timeout Period●Small SOT Package
Note: The first “_ _” is a placeholder for the threshold voltage
level of the devices. A desired threshold level is set by the part
number suffix found in Table 1. The third “_” is a placeholder for
the manual reset setup period of the devices. A desired setup
period is set by the letter suffix found in Table 2. All devices are
available in tape-and-reel only. There is a 2500-piece minimum
order increment for standard versions (Table 2). Sample stock
is typically held on standard versions only. Nonstandard ver-
sions require a minimum order increment of 10,000 pieces.
Contact factory for availability.
Devices are available in both leaded and lead(Pb)-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
PARTTEMP RANGEPIN-PACKAGE
MAX6453UT_ _ _-T-40°C to +85°C6 SOT23
MAX6454UT_ _ _-T-40°C to +85°C6 SOT23
MAX6455UT_ _ _-T-40°C to +85°C6 SOT23
MAX6456UT_ _ _-T-40°C to +85°C6 SOT23
GND
VCCMROUT6MRRSTIN
RESET
MAX6453
MAX6454
SOT23-6TOP VIEW4
GND
VCCMROUT6MRRSTIN
RESET
MAX6455
MAX6456
SOT23-64
MAX6453–MAX6456µP Supervisors with Separate VCC Reset and
Manual Reset Outputs
Pin Conigurations
Selector Guide appears at end of data sheet.
Ordering Information
(All voltages referenced to GND)
VCC ........................................................................-0.3V to +6V
Open-Drain RESET, MROUT ..................................-0.3V to +6V
MR, Push-Pull RESET, MROUT ..............-0.3V to (VCC + 0.3V)
MR, RSTIN .............................................................-0.3V to +6V
Input Current, All Pins ......................................................±20mA
Continuous Power Dissipation (TA = +70°C)6-Pin SOT23 (derate 8.7mW/°C above +70°C) ..........696mW
Operating Temperature Range .......................... -40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow)
Lead(Pb)-free...............................................................+260°CContaining Lead ..........................................................+240°C
(VCC = 1.0V to 5.5V, TA = -40°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSOperating Voltage RangeVCC1.05.5V
VCC Supply CurrentICCVCC = 5.5V, no load720µAVCC = 3.6V, no load 616
VCC Reset ThresholdVTH
46 4.504.634.754.254.384.503.003.083.152.852.933.002.552.632.702.252.322.382.122.192.251.621.671.711.521.581.62
Reset Threshold Tempco60ppm/°C
Reset Threshold Hysteresis2 × VTHmV
RSTIN ThresholdVTH-RSTINTA = 0°C to +85°C0.6150.6300.645VTA = -40°C to +85°C0.6100.650
RSTIN Threshold HysteresisVHYST2.5mV
RSTIN Input CurrentIRSTIN-25+25nA
RSTIN to Reset Output DelayVRSTIN falling at 1mV/µs15µs
Reset Timeout PeriodtRP140210280ms
VCC to RESET Output DelaytRDVCC falling at 1mV/µs20µs
MR Minimum Setup Period
(Pulse Width)tMRMR to RESET6.7210.0813.44L4.486.728.162.243.364.481.121.682.24
MR Minimum Input PulseRESET asserted, MAX6455/MAX64562.243.364.48s
MR Glitch Rejection100ns
MR to MROUT Delay 200ns
MAX6453–MAX6456µP Supervisors with Separate VCC Reset and
Manual Reset Outputs
Electrical CharacteristicsStresses 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.
Absolute Maximum Ratings
Note 1: Devices production tested at TA = 25°C. Overtemperature limits are guaranteed by design.
(VCC = 1.0V to 5.5V, TA = -40°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSMR to VCC Pullup Impedance255075kΩ
RESET, MROUT Output Low
(Open Drain or Push-Pull)VOL
VCC ≥ 1.00V, ISINK = 50µA, outputs
asserted0.3
VCC ≥ 1.20V, ISINK = 100µA, outputs
asserted0.3
VCC ≥ 2.55V, ISINK = 1.2mA, outputs
asserted0.3
VCC ≥ 4.25V, ISINK = 3.2mA, outputs
asserted0.4
RESET, MROUT Output High
(Push-Pull)VOH
VCC ≥ 1.80V, ISOURCE = 200µA,
outputs deasserted0.8 × VCCVCC ≥ 3.15V, ISOURCE = 500µA,
outputs deasserted0.8 × VCC
VCC ≥ 4.75V, ISOURCE = 800µA,
outputs deasserted0.8 × VCC
RESET, MROUT Output
Open-Drain Leakage CurrentILKGOutputs deasserted1µA
MR Input Low VoltageVIL0.3 × VCCV
MR Input High VoltageVIH0.7 × VCCV
MAX6453–MAX6456µP Supervisors with Separate VCC Reset and
Manual Reset Outputs
Electrical Characteristics (continued)
(VCC = 3.3V, TA = +25°C, unless otherwise noted.)
VCC TO RESET DELAYMAX6453 toc08
TIME (100µs/div)
VCC (100mV/div)
RESET (2V/div)
VCC = 4.5VVTH = 4.392V
VCC = 4.3V
MANUAL RESET TO MROUT AND
RESET DELAY (MAX6455/MAX6456)MAX6453 toc07
TIME (1s/div)
MR (5V/div)
MROUT (5V/div)
RESET (5V/div)
VCC = 5V
RSTIN TO RESET DELAY
vs. TEMPERATURE (RSTIN FALLING)MAX6453 toc06
TEMPERATURE (°C)
RSTIN TO RESET DELAY (3510-15
RSTIN FALLING AT 1mV/µs
VCC TO RESET DELAY
vs. TEMPERATUREMAX6453 toc05
TEMPERATURE (°C)
TO RESET DELAY (3510-15
VCC FALLING AT 1mV/µs
NORMALIZED VCC RESET THRESHOLD
vs. TEMPERATUREMAX6453 toc04
TEMPERATURE (°C)
NORMALIZED V
RESET THRESHOLD3510-15
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
MAX6453 toc03
RESET THRESHOLD OVERDRIVE (mV)
TRANSIENT DURATION (
RESET OCCURS
ABOVE THE CURVE
VTH = 4.4V
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATUREMAX6453 toc02
TEMPERATURE (°C)
NORMALIZED TIMEOUT PERIOD3510-15
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6453 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
TA = +85°C
TA = -40°C
TA = +25°C
MAX6453–MAX6456µP Supervisors with Separate VCC Reset and
Manual Reset Outputs
Typical Operating Characteristics
PIN
NAMEFUNCTIONMAX6453
MAX6454
MAX6455
MAX6456—
RESET
Active-Low Push-Pull or Open-Drain Output. RESET changes from high to low when
VCC or RSTIN drops below its selected reset threshold. RESET remains low for the
140ms (min) reset timeout period after all monitored power-supply inputs exceed their
selected reset thresholds. MR does not affect RESET output. For open-drain outputs,
connect to an external pullup resistor.1
Active-Low Push-Pull or Open-Drain Output. RESET changes from high to low when
VCC or RSTIN drops below its selected reset threshold. RESET remains low for the
140ms (min) reset timeout period after all monitored power-supply inputs exceed their
selected reset thresholds. RESET changes from high to low after MR input is held
low for the extended (typ) setup timeout period and deasserts 140ms (min) after MR
deasserts. For open-drain outputs, connect to an external pullup resistor.2GNDGround3MROUT
Manual Reset Push-Pull or Open-Drain Output. MROUT asserts immediately after MR
is pulled low. MROUT remains low for 140ms (min) after MR is deasserted. For open-
drain outputs, connect to an external pullup resistor.4VCCVCC Voltage Input. Power supply and input for the primary microprocessor voltage reset
monitor.5RSTIN
Reset Input. High-impedance input to the adjustable reset comparator. Connect RSTIN
to the center point of an external resistor divider to set the threshold of the externally
monitored voltage.—
Manual Reset Input. Internal 50kΩ pullup to VCC. Pull MR low to immediately assert
MROUT. MR does not affect RESET output.6
Manual Reset Input. Internal 50kΩ pullup to VCC. Pull MR low to immediately assert
MROUT. RESET changes from high to low after MR input is held low for the extended
(typ) setup timeout period.
MAX6453–MAX6456µP Supervisors with Separate VCC Reset and
Manual Reset Outputs
Pin Description
Detailed Description
Reset OutputThe reset output is typically connected to the reset input of
a microprocessor (µP). A µP’s reset input starts or restarts
the µP in a known state. The MAX6453–MAX6456 µP
supervisory circuits provide the reset logic to prevent
code-execution errors during power-up, power-down and
brownout conditions (see the Typical Operating Circuit).
RESET changes from high to low whenever the moni-
tored voltage (RSTIN or VCC) drops below the reset
threshold voltages. When VRSTIN and VCC exceed their
respective reset threshold voltages, RESET remains low
for the reset timeout period, and then goes high. RESET
changes from high to low after MR input is held low for the
extended (typ) setup timeout period and deasserts 140ms
(min) after MR deasserts.
RESET is guaranteed to be in the proper output logic
state for VCC inputs ≥ 1V. For applications requiring valid
reset logic when VCC is less than 1V, see the Ensuring a
Valid RESET Output Down to VCC = 0V section.
Manual Reset The MAX6453/MAX6454 contain a manual reset output
(MROUT) that asserts low immediately after driving MR
low and remains low for the reset timeout period after
MR goes high (Figure 1). The pushbutton manual reset
has no effect on the RESET output. MROUT output can
be used to drive an NMI (nonmaskable interrupt) on the
processor to save valuable data.
The MAX6455/MAX6456’s MROUT is asserted imme-
diately upon driving MR low. Driving MR low for longer
than the extended (typ) setup timeout period asserts
RESET. When MR is deasserted, MROUT and RESET
remain asserted low for the reset timeout period after
MR goes high (Figure 2).
Adjustable Input Voltage (RSTIN)The MAX6453–MAX6456 monitor the voltage on RSTIN
using an adjustable reset threshold set with an external
resistor voltage divider (Figure 3). Use the following
formula to calculate the externally monitored voltage
(VMON-TH):
VMON-TH = VTH-RSTIN × (R1 +R2)/R2
where VMON_TH is the desired reset threshold voltage
and VTH-RSTIN is the reset input threshold (0.63V).
Resistors R1 and R2 can have very high values to mini-
mize current consumption due to low leakage currents.
Set R2 to some conveniently high value (250kΩ, for
example) and calculate R1 based on the desired reset
threshold voltage, using the following formula:
R1 = R2 5 (VMON_TH/VTH - 1)Ω
Figure 2. MAX6455/MAX6456 Timing Diagram
Figure 1. MAX6453/MAX6454 Timing Diagram
210ms
MROUT
RESET
LONG SETUP PERIOD
210ms
MROUT
MAX6453–MAX6456µP Supervisors with Separate VCC Reset and
Manual Reset Outputs
