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MAX6749KA+TN/AN/a2500avaiµP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
MAX6746KA26+TMAXICN/a2500avaiµP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
MAX6746KA29+TMAXIMN/a2480avaiµP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
MAX6747KA29+TN/AN/a2500avaiµP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
MAX6747KA31+T |MAX6747KA31TMAXIMN/a2387avaiµP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
MAX6749KA+T |MAX6749KATMAXIMN/a1275avaiµP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
MAX6751KA29+MAIXMN/a2500avaiµP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
MAX6751KA31+T |MAX6751KA31TMAXIMN/a1760avaiµP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
MAX6751KA46+TN/AN/a2500avaiµP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
MAX6753KA30/V+T |MAX6753KA30V+TMAXIMN/a670avaiµP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay


MAX6746KA26+T ,µP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout DelayElectrical Characteristics(V = +1.2V to +5.5V, T = T to T , unless otherwise specified. Typical val ..
MAX6746KA29+T ,µP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout DelayElectrical Characteristics(V = +1.2V to +5.5V, T = T to T , unless otherwise specified. Typical val ..
MAX6747KA29+T ,µP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout DelayApplicationssupervisory circuits monitor single/dual system supply • Factory-Set Reset Threshold Op ..
MAX6747KA31+T ,µP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delayfeatures • Manual-Reset Input Optionimmunity to power-supply transients.• Push-Pull or Open-Drain R ..
MAX6749KA+T ,µP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout DelayFeatures● Configurable Reset and Watchdog Options Enables The MAX6746–MAX6753 low-power microproces ..
MAX6749KA+T ,µP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout DelayGeneral Description Beneits and
MB3776 ,Switching Regulator ControllerFEATURES• Wide supply voltage range: (2 V to 15 V)• Wide oscillation frequency range, high-frequenc ..
MB3776A ,Switching Regulator ControllerFUJITSU SEMICONDUCTORDS04-27201-3EDATA SHEETASSP For Power Supply
MB3776AP ,Switching Regulator ControllerFEATURES• Wide supply voltage range: (2 V to 15 V)• Wide oscillation frequency range, high-frequenc ..
MB3776APF ,Switching Regulator ControllerFUJITSU SEMICONDUCTORDS04-27201-3EDATA SHEETASSP For Power Supply
MB3776APFV ,Switching Regulator ControllerFEATURES• Wide supply voltage range: (2 V to 15 V)• Wide oscillation frequency range, high-frequenc ..
MB3776APFV ,Switching Regulator ControllerFUJITSU SEMICONDUCTORDS04-27201-3EDATA SHEETASSP For Power Supply


MAX6746KA26+T-MAX6746KA29+T-MAX6747KA29+T-MAX6747KA31+T-MAX6749KA+T-MAX6751KA29+-MAX6751KA31+T-MAX6751KA46+T-MAX6753KA30/V+T
µP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
General Description
The MAX6746–MAX6753 low-power microprocessor (μP)
supervisory circuits monitor single/dual system supply
voltages from 1.575V to 5V and provide maximum adjust-
ability for reset and watchdog functions. These devices
assert a reset signal whenever the VCC supply voltage or
RESET IN falls below its reset threshold or when manual
reset is pulled low. The reset output remains asserted for
the reset timeout period after VCC and RESET IN rise
above the reset threshold. The reset function features
immunity to power-supply transients.
The MAX6746–MAX6753 have ±2% factory-trimmed
reset threshold voltages in approximately 100mV
increments from 1.575V to 5.0V and/or adjustable reset
threshold voltages using external resistors.
The reset and watchdog delays are adjustable with
external capacitors. The MAX6746–MAX6751 contain
a watchdog select input that extends the watchdog
timeout period by 128x. The MAX6752/MAX6753 contain
a window watchdog timer that looks for activity outside an
expected window of operation.
The MAX6746–MAX6753 are available with a push-pull
or open-drain active-low RESET output. The MAX6746–
MAX6753 are available in an 8-pin SOT23 package and
are fully specified over the automotive temperature range (-40°C to +125°C).
Applications
●Medical Equipment●Automotive●Intelligent Instruments●Portable Equipment●Battery-Powered Computers/Controllers●Embedded Controllers●Critical μP Monitoring●Set-Top Boxes●Computers
Beneits and Features
●Configurable Reset and Watchdog Options Enables
Wide Variety of ApplicationsFactory-Set Reset Threshold Options from 1.575V
to 5V in ~100mV IncrementsAdjustable Reset Threshold OptionsSingle/Dual Voltage MonitoringCapacitor-Adjustable Reset TimeoutCapacitor-Adjustable Watchdog TimeoutMin/Max (Windowed) Watchdog OptionManual-Reset Input OptionPush-Pull or Open-Drain RESET Output Options●3.7μA Supply Current Reduces System Power
Consumption●Integrated Power Supply Protection Increases
RobustnessPower-Supply Transient Immunity Guaranteed RESET Valid for VCC ≥ 1V●8-Pin SOT23 Packages Saves Board Space
Pin Configurations continued at end of data sheet.
Selector Guide and Ordering Information appear at end of data sheet.

WDI
WDSGND
VCC
RESETSWT
SRT
RESET IN (MR)
( ) ARE FOR MAX6746 AND MAX6747 ONLY.
TOP VIEW
MAX6746–
MAX6751
SOT23
MAX6746–MAX6753μP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
Pin Conigurations
MAX6748
MAX6749
MAX6750
MAX6751

RESET IN
GND
SRT
VCC
VCC
SWT
CSRT
CSWT
VIN
WDI
WDS
I/O
WDS = 0 FOR NORMAL MODE
WDS = VCC FOR EXTENDED MODE
MAX6749
MAX4751
RESETRESET
Typical Operating Circuit
VCC to GND...........................................................-0.3V to +6.0V
SRT, SWT, SET0, SET1, RESET IN, WDS, MR,
WDI, to GND......................................…-0.3V to (VCC + 0.3V)
RESET (Push-Pull) to GND....................…-0.3V to (VCC + 0.3V)
RESET (Open Drain) to GND.............................…-0.3V to +6.0VInput Current (All Pins).....................................................±20mA
Output Current (RESET) ...................................................±20mA
Continuous Power Dissipation (TA = +70°C) 8-Pin SOT23 (derate 8.9mW/°C above +70°C)...........714mW
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range ............................-65°C to +150°C
Junction Temperature......................................................+150°CLead Temperature (soldering, 10s) .................................+300°CSoldering Temperature (reflow) .......................................+260°C
(VCC = +1.2V to +5.5V, TA = TMIN to TMAX, unless otherwise specified. Typical values are at VCC = +5V and TA = +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

Supply VoltageVCCTA = 0°C to +125°C1.05.5VTA = -40°C to 0°C1.25.5
Supply CurrentICC
VCC ≤ 5.5V510VCC ≤ 3.3V4.29
VCC ≤ 2.0V3.78
VCC Reset ThresholdVTHSee VTH
selection tableTA = -40°C to +125°CVTH -
VTH + V
HysteresisVHYST0.8%
VCC Reset Threshold (MAX6752AKA32 Only)TA = -40°C to +125°C3.1363.224V
Hysteresis (MAX6752AKA32 Only)VHYST0.650.800.90%
VCC to Reset DelayVCC falling from VTH + 100mV to VTH
-100mV at 1mV/µs 20µs
Reset Timeout PeriodtRPCSRT = 1500pF5.6927.5909.487msCSRT = 100pF0.506
SRT Ramp CurrentIRAMPVSRT = 0 to 1.23V; VCC = 1.6V to 5V200250300nA
SRT Ramp ThresholdVRAMP VCC = 1.6V to 5V (VRAMP rising)1.1731.2351.297V
Normal Watchdog Timeout Period (MAX6746–MAX6751)tWDCSWT = 1500pF5.6927.5909.487ms
CSWT = 100pF0.506
Extended Watchdog Timeout (MAX6746–MAX6751)tWDCSWT = 1500pF728.6971.51214.4msCSWT = 100pF64.77
Slow Watchdog Period (MAX6752/MAX6753)tWD2CSWT = 1500pF728.6971.51214.4msCSWT = 100pF64.77
Fast Watchdog Timeout Period,
SET Ratio = 8, (MAX6752/MAX6753)
tWD1
CSWT = 1500pF91.08121.43151.80
CSWT = 100pF8.09
Fast Watchdog Timeout Period,
SET Ratio = 16, (MAX6752/MAX6753)
tWD1
CSWT = 1500pF45.5360.7175.89
CSWT = 100pF4.05
MAX6746–MAX6753μP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
Absolute Maximum Ratings

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
(VCC = +1.2V to +5.5V, TA = TMIN to TMAX, unless otherwise specified. Typical values are at VCC = +5V and TA = +25°C.) (Note 1)
Note 1:
Production testing done at TA = +25°C. Over temperature limits are guaranteed by design.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

Fast Watchdog Timeout Period,
SET Ratio = 64, (MAX6752/MAX6753)
tWD1
CSWT = 1500pF11.3815.1818.98
CSWT = 100pF1.01
Fast Watchdog Minimum Period (MAX6752/MAX6753)2000ns
SWT Ramp CurrentIRAMPVSWT = 0 to 1.23V, VCC = 1.6V to 5V200250300nA
SWT Ramp ThresholdVRAMPVCC = 1.6V to 5V (VRAMP rising)1.1731.2351.297V
RESET Output-Voltage Low Open-Drain, Push-Pull (Asserted)
VOL
VCC ≥ 1.0V, ISINK = 50µA 0.3VCC ≥ 2.7V, ISINK = 1.2mA0.3
VCC ≥ 4.5V, ISINK = 3.2mA0.4
RESET Output-Voltage High, Push-Pull (Not Asserted)VOH
VCC ≥ 1.8V, ISOURCE = 200µA0.8 x VCCVCC ≥ 2.25V, ISOURCE = 500µA0.8 x VCC
VCC ≥ 4.5V, ISOURCE = 800µA0.8 x VCC
RESET Output Leakage Current,
Open DrainILKGVCC > VTH, reset not asserted,
VRESET = 5.5V1.0µA
DIGITAL INPUTS (MR, SET0, SET1, WDI, WDS)

Input Logic Levels
VILVCC ≥ 4.0V0.8VIH2.4
VILVCC < 4.0V0.3 x VCC
VIH0.7 x VCC
MR Minimum Pulse Width1µs
MR Glitch Rejection100ns
MR-to-RESET Delay200ns
MR Pullup ResistancePullup to VCC122028kΩ
WDI Minimum Pulse Width300ns
RESET IN

RESET IN ThresholdVRESET IN TA = -40°C to +125°C1.2161.2351.254V
RESET IN Leakage CurrentIRESET IN-50±1+50nA
RESET IN to RESET DelayRESET IN falling at 1mV/µs 20µs
MAX6746–MAX6753μP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
Electrical Characteristics (continued)
(VCC = +5V, TA = +25°C, unless otherwise noted.)
WATCHDOG TIMEOUT PERIOD vs. CSWT

MAX6746 toc02
CSWT (pF)
WATCHDOG TIMEOUT PERIOD (ms)
10,0001000
10,000
100,000
100100,000
MAX6746–MAX6751
EXTENDED MODE
NORMAL MODE
SUPPLY CURRENT
vs. SUPPLY VOLTAGE

MAX6746 toc03
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)4326
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE

MAX6746 toc04
TEMPERATURE (°C)
NORMALIZED TIMEOUT PERIOD
CSRT = 100pF
CSRT = 1500pF
NORMALIZED WATCHDOG TIMEOUT PERIOD
vs. TEMPERATURE

MAX6746 toc05
TEMPERATURE (°C)
NORMALIZED TIMEOUT PERIOD
CSWT = 100pF
CSWT = 1500pF
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE

MAX6746 toc06
RESET THRESHOLD OVERDRIVE (mV)
TRANSIENT DURATION (µs)
RESET OCCURS
ABOVE THE CURVE
VTH = 2.92V
SUPPLY CURRENT
vs. TEMPERATURE

MAX6746 toc07
SUPPLY CURRENT (µA)
VCC = 3.3V
VCC = 1.8V
VCC = 5V
RESET TIMEOUT PERIOD vs. CSRT

MAX6746 toc01
CSRT (pF)
RESET TIMEOUT PERIOD (ms)
10,0001000
100100,000
NORMALIZED RESET IN THRESHOLD VOLTAGE
vs. TEMPERATURE

MAX6746 toc08
NORMALIZED RESET THRESHOLD VOLTAGE
VCC = 5V
RESET IN THRESHOLD
vs. SUPPLY VOLTAGE

MAX6746 toc08b
RESET IN THRESHOLD (V)432
MAX6746–MAX6753μP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
Typical Operating Characteristics
(VCC = +5V, TA = +25°C, unless otherwise noted.)
PIN
NAMEFUNCTIONMAX6746
MAX6747
MAX6748–
MAX6751
MAX6752
MAX6753
——MRManual-Reset Input. Pull MR low to manually reset the device. Reset
remains asserted for the reset timeout period after MR is released.1—RESET IN
Reset Input. High-impedance input to the adjustable reset comparator.
Connect RESET IN to the center point of an external resistor-divider to
set the threshold of the externally monitored voltage. —1SET0Logic Input. SET0 selects watchdog window ratio or disables the
watchdog timer. See Table 1.22SWT
Watchdog Timeout Input.
MAX6746–MAX6751: Connect a capacitor between SWT and ground to
set the basic watchdog timeout period (tWD). Determine the period by
the formula tWD = 5.06 x 106 x CSWT with tWD in seconds and CSWT
in Farads. Extend the basic watchdog timeout period by using the WDS
input. Connect SWT to ground to disable the watchdog timer function.
MAX6752/MAX6753: Connect a capacitor between SWT and ground
to set the slow watchdog timeout period (tWD2). Determine the slow
watchdog period by the formula: tWD2 = 0.65 x 109 x CSWT with tWD2 in
seconds and CSWT in Farads. The fast watchdog timeout period is set
by pin strapping SET0 and SET1 (Connect SET0 high and SET1 low to disable the watchdog timer function.) See Table 1.33SRT
Reset Timeout Input. Connect a capacitor from SRT to GND to select
the reset timeout period. Determine the period as follows: tRP = 5.06 x
106 x CSRT with tRP in seconds and CSRT in Farads.
VCC TO RESET DELAY
vs. TEMPERATURE (VCC FALLING)

MAX6746 toc09
TEMPERATURE (°C)
TO RESET DELAY (µs)
VCC FALLING AT 1mV/µs
RESET AND WATCHDOG
TIMEOUT PERIOD vs. SUPPLY VOLTAGE

MAX6746 toc10
VCC (V)
TIMEOUT PERIOD (ms)
CSWT = CSRT = 100pF
RESET AND WATCHING TIMEOUT
PERIOD vs. SUPPLY VOLTAGE

MAX6746 toc11
VCC (V)
TIMEOUT PERIOD (ms)
CSWT = CSRT = 1500pF
RESET
WATCHDOG
MAX6746–MAX6753μP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
Typical Operating Characteristics (continued)
Pin Coniguration
PIN
NAMEFUNCTIONMAX6746
MAX6747
MAX6748–
MAX6751
MAX6752
MAX6753
5—WDS
Watchdog Select Input. WDS selects the watchdog mode. Connect
WDS to ground to select normal mode and the watchdog timeout
period. Connect WDS to VCC to select extended mode, multiplying the
basic timeout period by a factor of 128. A change in the state of WDS
clears the watchdog timer.—5SET1Logic Input. SET1 selects the watchdog window ratio or disables the
watchdog timer. See Table 1.66WDI
Watchdog Input.
MAX6746–MAX6751: A falling transition must occur on WDI within
the selected watchdog timeout period or a reset pulse occurs. The
watchdog timer clears when a transition occurs on WDI or whenever
RESET is asserted. Connect SWT to ground to disable the watchdog
timer function.
MAX6752/MAX6753: WDI falling transitions within periods shorter than
tWD1 or longer than tWD2 force RESET to assert low for the reset
timeout period. The watchdog timer begins to count after RESET is
deasserted. The watchdog timer clears when a valid transition occurs
on WDI or whenever RESET is asserted. Connect SET0 high and SET1
low to disable the watchdog timer function. See the Watchdog Timer
section.77RESET
Push/Pull or Open-Drain Reset Output. RESET asserts whenever VCC
or RESET IN drops below the selected reset threshold voltage (VTH or
VRESET IN, respectively) or manual reset is pulled low. RESET remains
low for the reset timeout period after all reset conditions are deasserted,
and then goes high. The watchdog timer triggers a reset pulse (tRP)
whenever a watchdog fault occurs.88VCCSupply Voltage. VCC is the power-supply input and the input for ixed
threshold VCC monitor.
MAX6746–MAX6753μP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
Pin Description (continued)
Detailed Description
The MAX6746–MAX6753 assert a reset signal whenever
the VCC supply voltage or RESET IN falls below its reset
threshold. The reset output remains asserted for the reset
timeout period after VCC and RESET IN rise above its
respective reset threshold. A watchdog timer triggers a
reset pulse whenever a watchdog fault occurs.
The reset and watchdog delays are adjustable with
external capacitors. The MAX6746–MAX6751 contain a
watchdog select input that extends the watchdog timeout
period to 128x.
The MAX6752 and MAX6753 have a sophisticated watch-
dog timer that detects when the processor is running out-
side an expected window of operation. The watchdog sig-
nals a fault when the input pulses arrive too early (faster
that the selected tWD1 timeout period) or too late (slower
than the selected tWD2 timeout period) (see Figure 1).
Reset Output

The reset output is typically connected to the reset input of a μP. A μP’s reset input starts or restarts the μP in a known state. The MAX6746–MAX6753 μP supervisory
circuits provide the reset logic to prevent code-execution
errors during power-up, power-down, and brownout condi-
tions (see the Typical Operating Circuit). RESET changes
from high to low whenever the monitored voltage, RESET
IN and/or VCC drop below the reset threshold voltages.
Once VRESET IN and/or VCC exceeds its respective reset threshold voltage(s), RESET remains low for the reset
RESET is guaranteed to be in the correct logic state for
VCC greater than 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.
RESET IN Threshold

The MAX6748–MAX6751 monitor the voltage on RESET
IN using an adjustable reset threshold (VRESET IN) set with an external resistor voltage-divider (Figure 2). Use
the following formula to calculate the externally monitored
voltage (VMON_TH):
VMON_TH = VRESET IN x (R1 + R2)/R2
Figure 1. MAX6752/MAX6753 Detailed Watchdog Input Timing Relationship
Figure 2. Calculating the Monitored Threshold Voltage
WDI CONDITION 1
WDI CONDITION 2
WDI CONDITION 3
GUARANTEED TO
NOT ASSERT
RESET
GUARANTEED TO
ASSERT
RESET
tWD1 (MIN)tWD1 (MAX)
*UNDETERMINED*UNDETERMINED
FAST FAULT
NORMAL OPERATION
SLOW FAULT
*UNDETERMINED STATES MAY OR MAY NOT GENERATE A FAULT CONDITION
GUARANTEED
TO ASSERT
RESET
tWD2 (MIN)tWD2 (MAX)
MAX6748
MAX6749
MAX6750
MAX6751

RESET IN
GND
VCC
VCC
VMON_TH
VMON_TH = 1.235 x (R1 + R2) / R2
MAX6746–MAX6753μP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
where VMON_TH is the desired reset threshold voltage
and VTH is the reset input threshold (1.235V). Resistors
R1 and R2 can have very high values to minimize
current consumption due to low leakage currents. Set R2 to some conveniently high value (500kΩ, for example)
and calculate R1 based on the desired reset threshold
voltage, using the following formula:
R1 = R2 x (VMON_TH/VRESET IN - 1) (Ω)
The MAX6748 and MAX6749 do not monitor VCC
supply voltage; therefore, VCC must be greater than 1.5V
to guarantee RESET IN threshold accuracy and tim-ing performance. The MAX6748 and MAX6749 can be
configured to monitor VCC voltage by connecting VCC to
VMON_TH.
Dual-Voltage Monitoring (MAX6750/MAX6751)

The MAX6750 and MAX6751 contain both factory-trimmed
threshold voltages and an adjustable reset threshold input,
allowing the monitoring of two voltages, VCC and VMON_
TH (see Figure 2). RESET is asserted when either of the
voltages fall below its respective threshold voltages.
Manual Reset (MAX6746/MAX6747)

Many μP-based products require manual-reset capability
to allow an operator or external logic circuitry to initiate a
reset. The manual-reset input (MR) can connect directly
to a switch without an external pullup resistor or debounc-
ing network. MR is internally pulled up to VCC and, there-
fore, can be left unconnected if unused.
MR is designed to reject fast, falling transients (typically 100ns pulses) and must be held low for a minimum of 1μs to assert the reset output. A 0.1μF capacitor from MR
to ground provides additional noise immunity. After MR
transitions from low to high, reset remains asserted for the
duration of the reset timeout period.manual-reset option can easily be implemented with
the MAX6748–MAX6751 by connecting a normally open momentary switch in parallel with R2 (Figure 3). When
the switch is closed, the voltage on RESET IN goes to
zero, initiating a reset. Similar to the MAX6746/MAX6747
manual reset, reset remains asserted while the voltage at
RESET IN is zero and for the reset timeout period after
the switch is opened.
Figure 4a. Watchdog Timing Diagram, WDS = GND
Figure 3. Adding an External Manual-Reset Function to the
MAX6748–MAX6751
VCC
WDItWDtRP
RESET
NORMAL MODE (WDS = GND)
VCC
MAX6748
MAX6749
MAX6750
MAX6751

RESET IN
GND
VCC
VCC
VMON_TH
MAX6746–MAX6753μP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
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