General Description
The 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.
PART TEMP RANGE PIN-PACKAGE
MAX6453UT_ _ _-T -40°C to +85°C 6 SOT23
MAX6454UT_ _ _-T -40°C to +85°C 6 SOT23
MAX6455UT_ _ _-T -40°C to +85°C 6 SOT23
MAX6456UT_ _ _-T -40°C to +85°C 6 SOT23
GND
VCC
MROUT
1 6 MR
5 RSTIN
RESET
MAX6453
MAX6454
SOT23-6
TOP VIEW
2
3 4
GND
VCC
MROUT
1 6 MR
5 RSTIN
RESET
MAX6455
MAX6456
SOT23-6
2
3 4
MAX6453–MAX6456 µP Supervisors with Separate VCC Reset and
Manual Reset Outputs
19-2637; Rev 4; 5/14
Pin Congurations
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°C
Containing 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)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Voltage Range VCC 1.0 5.5 V
VCC Supply Current ICC
VCC = 5.5V, no load 7 20 µA
VCC = 3.6V, no load 6 16
VCC Reset Threshold VTH
46 4.50 4.63 4.75
V
44 4.25 4.38 4.50
31 3.00 3.08 3.15
29 2.85 2.93 3.00
26 2.55 2.63 2.70
23 2.25 2.32 2.38
22 2.12 2.19 2.25
17 1.62 1.67 1.71
16 1.52 1.58 1.62
Reset Threshold Tempco 60 ppm/°C
Reset Threshold Hysteresis 2 × VTH mV
RSTIN Threshold VTH-RSTIN
TA = 0°C to +85°C 0.615 0.630 0.645 V
TA = -40°C to +85°C 0.610 0.650
RSTIN Threshold Hysteresis VHYST 2.5 mV
RSTIN Input Current IRSTIN -25 +25 nA
RSTIN to Reset Output Delay VRSTIN falling at 1mV/µs 15 µs
Reset Timeout Period tRP 140 210 280 ms
VCC to RESET Output Delay tRD VCC falling at 1mV/µs 20 µs
MR Minimum Setup Period
(Pulse Width) tMR MR to RESET
K 6.72 10.08 13.44
s
L 4.48 6.72 8.16
S 2.24 3.36 4.48
T 1.12 1.68 2.24
MR Minimum Input Pulse RESET asserted, MAX6455/MAX6456 2.24 3.36 4.48 s
MR Glitch Rejection 100 ns
MR to MROUT Delay 200 ns
Manual Reset Timeout Period tMRP 140 210 280 ms
MAX6453–MAX6456 µP Supervisors with Separate VCC Reset and
Manual Reset Outputs
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Electrical Characteristics
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.
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)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MR to VCC Pullup Impedance 25 50 75 kW
RESET, MROUT Output Low
(Open Drain or Push-Pull) VOL
VCC ≥ 1.00V, ISINK = 50µA, outputs
asserted 0.3
V
VCC ≥ 1.20V, ISINK = 100µA, outputs
asserted 0.3
VCC ≥ 2.55V, ISINK = 1.2mA, outputs
asserted 0.3
VCC ≥ 4.25V, ISINK = 3.2mA, outputs
asserted 0.4
RESET, MROUT Output High
(Push-Pull) VOH
VCC ≥ 1.80V, ISOURCE = 200µA,
outputs deasserted 0.8 × VCC
V
VCC ≥ 3.15V, ISOURCE = 500µA,
outputs deasserted 0.8 × VCC
VCC ≥ 4.75V, ISOURCE = 800µA,
outputs deasserted 0.8 × VCC
RESET, MROUT Output
Open-Drain Leakage Current ILKG Outputs deasserted 1 µA
MR Input Low Voltage VIL 0.3 × VCC V
MR Input High Voltage VIH 0.7 × VCC V
MAX6453–MAX6456 µP Supervisors with Separate VCC Reset and
Manual Reset Outputs
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Electrical Characteristics (continued)
(VCC = 3.3V, TA = +25°C, unless otherwise noted.)
VCC TO RESET DELAY
MAX6453 toc08
TIME (100µs/div)
VCC (100mV/div)
RESET (2V/div)
VCC = 4.5V
VTH = 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 (µs)
603510-15
20.4
20.8
21.2
21.6
22.0
22.4
22.8
23.2
23.6
24.0
20.0
-40 85
RSTIN FALLING AT 1mV/µs
VCC TO RESET DELAY
vs. TEMPERATURE
MAX6453 toc05
TEMPERATURE (°C)
VCC TO RESET DELAY (µs)
603510-15
20.4
20.8
21.2
21.6
22.0
22.4
22.8
23.2
23.6
24.0
20.0
-40 85
VCC FALLING AT 1mV/µs
NORMALIZED VCC RESET THRESHOLD
vs. TEMPERATURE
MAX6453 toc04
TEMPERATURE (°C)
NORMALIZED VCC RESET THRESHOLD
603510-15
0.98
0.99
1.00
1.01
1.02
1.03
0.97
-40 85
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
MAX6453 toc03
RESET THRESHOLD OVERDRIVE (mV)
TRANSIENT DURATION (µs)
800600400200
50
100
150
200
250
0
0 1000
RESET OCCURS
ABOVE THE CURVE
VTH = 4.4V
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE
MAX6453 toc02
TEMPERATURE (°C)
NORMALIZED TIMEOUT PERIOD
603510-15
0.96
0.97
0.98
0.99
1.00
1.01
1.02
1.03
1.04
1.05
0.95
-40 85
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6453 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
5.04.53.5 4.02.0 2.5 3.01.5
1
2
3
4
5
6
7
8
9
0
1.0 5.5
TA = +85°C
TA = -40°C
TA = +25°C
MAX6453–MAX6456 µP Supervisors with Separate VCC Reset and
Manual Reset Outputs
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Typical Operating Characteristics
PIN
NAME FUNCTION
MAX6453
MAX6454
MAX6455
MAX6456
1 —
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.
2 2 GND Ground
3 3 MROUT 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.
4 4 VCC VCC Voltage Input. Power supply and input for the primary microprocessor voltage reset
monitor.
5 5 RSTIN
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.
6 —
MR
Manual Reset Input. Internal 50kW pullup to VCC. Pull MR low to immediately assert
MROUT. MR does not affect RESET output.
— 6
Manual Reset Input. Internal 50kW 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–MAX6456 µP Supervisors with Separate VCC Reset and
Manual Reset Outputs
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Pin Description
Detailed Description
Reset Output
The 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 (250kW, for
example) and calculate R1 based on the desired reset
threshold voltage, using the following formula:
R1 = R2 5 (VMON_TH/VTH - 1)W
Figure 2. MAX6455/MAX6456 Timing Diagram
Figure 1. MAX6453/MAX6454 Timing Diagram
210ms
MROUT
RESET
MR
LONG SETUP PERIOD
210ms
MROUT
MR
MAX6453–MAX6456 µP Supervisors with Separate VCC Reset and
Manual Reset Outputs
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Applications Information
Interrupt Before Reset
To minimize data loss and speed system recovery/test,
many applications interrupt the processor or reset only
portions of the system before a processor hard reset
is asserted. The extended setup time of the MAX6455/
MAX6456 MR input allows the same pushbutton (Figure
4) to control both the interrupt and hard reset functions.
If the pushbutton is closed for less than the extended
setup timeout period, the processor is only interrupted
(MROUT). If the system still does not respond properly,
the pushbutton can be closed for the full extended
setup timeout period to hard reset the processor
(RESET). If desired, connect a LED to the RESET out-
put to turn off (or on) to signify when the pushbutton is
closed long enough for a hard reset (the same LED can
be used as the front panel power-on display).
Interfacing to Other Voltages
for Logic Compatibility
The open-drain RESET output can be used to interface
to a µP with other logic levels. As shown in Figure 5, the
open-drain output can be connected to voltages from 0
to 6V.
Generally, the pullup resistor connected to the RESET
connects to the supply voltage being monitored at the
IC’s VCC pin. However, some systems might use the
open-drain output to level-shift from the monitored supply
to reset circuitry powered by some other supply (Figure
5). Keep in mind that as the supervisor’s VCC decreases
toward 1V, so does the IC’s ability to sink current at
RESET (RESET is pulled high as VCC decays toward
0). The voltage where this occurs depends on the pullup
resistor value and the voltage to which it is connected.
Ensuring a Valid RESET Down to VCC = 0V
(Push-Pull RESET)
When VCC falls below 1V, RESET current-sinking capabil-
ities decline drastically. The high-impedance CMOS-logic
inputs connected to RESET can drift to undetermined
voltages. This presents no problem in most applications,
because most µPs and other circuitry do not operate with
VCC below 1V.
In applications where RESET must be valid down to 0V,
add a pulldown resistor between RESET and GND for
the push/pull outputs. The resistor sinks any stray leak-
age currents, holding RESET low (Figure 6). The value
of the pulldown resistor is not critical; 100kW is large
enough not to load RESET and small enough to pull
RESET to ground. The external pulldown cannot be
used with the open-drain reset outputs.
Transient Immunity
In addition to issuing a reset to the µP during power-up,
power-down and brownout conditions, these supervisors
are relatively immune to short duration falling transients
(glitches). The graph Maximum Transient Duration vs.
Reset Threshold Overdrive in the Typical Operating
Characteristics section shows this relationship.
The area below the curves of the graph is the region in
which these devices typically do not generate a reset
pulse. This graph was generated using a negative
going pulse applied to VCC, starting above the actual
reset threshold (VTH) and ending below it by the magni-
tude indicated (reset-threshold overdrive). As the mag-
nitude of the transient increases (VCC goes further
below the reset threshold), the maximum allowable
pulse width decreases. Typically, a VCC transient that
goes 100mV below the reset threshold and lasts 20µs
or less does not cause a reset pulse to be issued.
Figure 3. Calculating The Monitored Threshold Voltages
MAX6453
MAX6455
RSTIN VCC
R1
R2
RESET
GND
VMON_TH = 0.63 x (R1 + R2) / R2
VMON_TH VCC
MAX6453–MAX6456 µP Supervisors with Separate VCC Reset and
Manual Reset Outputs
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Figure 6. Ensuring RESET Valid to VCC = 0
Figure 5. Interfacing to Other Voltage LevelsFigure 4. Interrupt Before Reset Application Circuit
MAX6453–
MAX6456
RSTIN
VCC
RESET
TIMOUT PERIOD
(210ms typ)
MROUT
TIMOUT PERIOD
(210ms typ)
MR-TO-RESET
SETUP PERIOD
(3.36s typ)
MAX6455/MAX6456
0.63V
1.23V
MR
GND
VCC
VCC
RESET
MROUT
MAX6453
MAX6455
RESET
VCC
GND
VCC
100kΩ
MAX6454
MAX6456 µP
RESET
RESET
GND
GND
VCC VCC
5V 3.3V
100kΩ
MAX6455
µP
VCC
RSTIN
RESET
NMI
LED
I/O
SUPPLY
CORE SUPPLY
PUSHBUTTON SWITCH
CLOSE FOR IMMEDIATE SYSTEM INTERRUPT
CLOSE FOR >3.36s FOR SYSTEM RESET
+3.3V
+1.5V
RESET
MROUT
GND MR
MAX6453–MAX6456 µP Supervisors with Separate VCC Reset and
Manual Reset Outputs
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Functional Diagram
Table 3. Standard Versions Table
Table 2. Manual Reset Setup Period
Table 1. Reset Voltage Threshold
PART MR TO RESET DELAY MR ASSERTION MROUT AND RESET
PUSH-PULL OUTPUT
MROUT AND RESET
OPEN-DRAIN OUTPUT
MAX6453 — MROUT ✔—
MAX6454 — MROUT —✔
MAX6455 ✔MROUT and RESET ✔—
MAX6456 ✔MROUT and RESET —✔
PART TOP
MARK PART TOP
MARK
MAX6453UT16S ABOG MAX6455UT16S ABOL
MAX6453UT23S ABOH MAX6455UT23S ABOM
MAX6453UT26S ABOI MAX6455UT26S ABON
MAX6453UT29S ABOJ MAX6455UT29S ABOO
MAX6453UT46S ABOK MAX6455UT46S ABER
MAX6454UT16S ABOP MAX6456UT16S ABES
MAX6454UT23S ABEQ MAX6456UT23S ABOT
MAX6454UT26S ABOQ MAX6456UT26S ABOU
MAX6454UT29S ABOR MAX6456UT29S ABOV
MAX6454UT46S ABOS MAX6456UT46S ABOW
PART NO.
SUFFIX
( _ )
MANUAL RESET PERIOD
(s)
K 10.08
L 6.72
S 3.36
T 1.68
PART NO.
SUFFIX
( _ _ )
VCC NOMINAL
VOLTAGE
THRESHOLD (V)
46 4.625
44 4.375
31 3.075
29 2.925
26 2.625
23 2.313
22 2.188
17 1.665
16 1.575
MAX6453
µP
VCC
RSTIN
RESET
NMI
I/O
SUPPLY
CORE SUPPLY
+3.3V
+1.5V
RESET
MROUT
GND
MR GND
MAX6453–MAX6456 µP Supervisors with Separate VCC Reset and
Manual Reset Outputs
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Typical Operating Circuit
Selector Guide
PACKAGE
TYPE
PACKAGE
CODE
DOCUMENT
NO.
LAND
PATTERN NO.
6 SOT23 U6-1 21-0058 90-0175
MAX6453–MAX6456 µP Supervisors with Separate VCC Reset and
Manual Reset Outputs
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Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
Chip Information
PROCESS: BiCMOS
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 10/02 Initial release —
3 6/10
Revised the General Description, Features, Applications, Ordering Information,
Absolute Maximum Ratings, Electrical Characteristics, Pin Description, the Reset
Output, Manual Reset, and Interrupt Before Reset sections, and Tables 2 and 3 to
add extended setup time specifications.
1, 2, 5, 6, 7, 9
4 5/14 No /V OPNs; removed automotive reference from Applications section 1
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
MAX6453–MAX6456 µP Supervisors with Separate VCC Reset and
Manual Reset Outputs
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Revision History
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MAX6453UT16S+T MAX6453UT17S+T MAX6453UT22S+T MAX6453UT23S+T MAX6453UT26S+T
MAX6453UT29S+T MAX6453UT31S+T MAX6453UT44S+T MAX6453UT46S+T MAX6454UT16S+T
MAX6454UT17S+T MAX6454UT22S+T MAX6454UT23S+T MAX6454UT26S+T MAX6454UT29S+T
MAX6454UT31S+T MAX6454UT44S+T MAX6454UT46S+T MAX6455UT16S+T MAX6455UT17S+T
MAX6455UT22S+T MAX6455UT23S+T MAX6455UT26S+T MAX6455UT29S+T MAX6455UT31S+T
MAX6455UT44S+T MAX6455UT46S+T MAX6456UT16S+T MAX6456UT17S+T MAX6456UT22S+T
MAX6456UT23S+T MAX6456UT26S+T MAX6456UT29L+T MAX6456UT29S+T MAX6456UT31S+T
MAX6456UT44S+T MAX6456UT46S+T