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MAX6352LSUK+T |MAX6352LSUKTMAXIMN/a2500avaiDual/Triple-Voltage µP Supervisory Circuits
MAX6352SYUKMAXIMN/a4165avaiDual/Triple-Voltage µP Supervisory Circuits
MAX6352TWUK+TMAXIMN/a482avaiDual/Triple-Voltage µP Supervisory Circuits
MAX6352TWUK-T |MAX6352TWUKTMAXIMN/a3556avaiDual/Triple-Voltage µP Supervisory Circuits
MAX6354LTUK+T |MAX6354LTUKTMAXIMN/a500avaiDual/Triple-Voltage µP Supervisory Circuits
MAX6355LSUT+N/AN/a2500avaiDual/Triple-Voltage µP Supervisory Circuits
MAX6355MSUT+N/AN/a2500avaiDual/Triple-Voltage µP Supervisory Circuits
MAX6355LSUT+T |MAX6355LSUTTMAXIMN/a1050avaiDual/Triple-Voltage µP Supervisory Circuits
MAX6355LSUT+T |MAX6355LSUTTMAXIM Pb-freeN/a387avaiDual/Triple-Voltage µP Supervisory Circuits
MAX6355MSUT+TMAXN/a2500avaiDual/Triple-Voltage µP Supervisory Circuits
MAX6355SVUT-T |MAX6355SVUTTMAXIMN/a1666avaiDual/Triple-Voltage µP Supervisory Circuits
MAX6355TWUT+TMAIXMN/a2500avaiDual/Triple-Voltage µP Supervisory Circuits
MAX6355TZUT+T |MAX6355TZUTTMAXIMN/a2290avaiDual/Triple-Voltage µP Supervisory Circuits
MAX6356LSUT+TMAXIMN/a469avaiDual/Triple-Voltage µP Supervisory Circuits
MAX6357LSUT+T |MAX6357LSUTTMAXIMN/a6310avaiDual/Triple-Voltage µP Supervisory Circuits
MAX6357TZUTMAXIM ?N/a48avaiDual/Triple-Voltage µP Supervisory Circuits
MAX6358SYUTMAXIMN/a110avaiDual/Triple-Voltage µP Supervisory Circuits
MAX6358SYUT+TMAXIMN/a1130avaiDual/Triple-Voltage µP Supervisory Circuits


MAX6357LSUT+T ,Dual/Triple-Voltage µP Supervisory CircuitsApplicationsThe MAX6354/MAX6357/MAX6360 offer an active-low, ● Computers ● Intelligent Instrumentsp ..
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MAX6358SYUT+T ,Dual/Triple-Voltage µP Supervisory CircuitsElectrical Characteristics(V 1 = V 2 = +1.2V to +5.5V, T = -40°C to +85°C, unless otherwise noted. ..
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MAX6352LSUK+T-MAX6352SYUK-MAX6352TWUK+T-MAX6352TWUK-T-MAX6354LTUK+T-MAX6355LSUT+-MAX6355LSUT+T-MAX6355MSUT+-MAX6355MSUT+T-MAX6355SVUT-T-MAX6355TWUT+T-MAX6355TZUT+T-MAX6356LSUT+T-MAX6357LSUT+T-MAX6357TZUT-MAX6358SYUT-MAX6358SYUT+T
Dual/Triple-Voltage µP Supervisory Circuits
General Description
The MAX6351–MAX6360 microprocessor (μP) supervi-sors with multiple reset voltages significantly improve system reliability and accuracy compared to separate ICs or discrete components. If any input supply voltage drops below its associated preset threshold, all reset outputs are asserted. In addition, the outputs are valid as long as either input supply voltage remains greater than +1.0V.
All devices in this series have an active-low debounced manual-reset input. In addition, the MAX6358/MAX6359/ MAX6360 offer a watchdog timer input with a 46.4s startup timeout period and a 2.9s timeout period. The MAX6355/MAX6356/MAX6357 offer an additional voltage-monitor input to monitor a third voltage.
The MAX6351 features two active-low, push-pull reset outputs, one is referenced to VCC1 and the other is refer-enced to VCC2. The MAX6353/MAX6356/MAX6359 offer an active-low, push-pull reset output referenced to VCC1. The MAX6354/MAX6357/MAX6360 offer an active-low, push-pull reset output referenced to VCC2.
All these devices are offered with a wide variety of voltage threshold levels, as shown in the Voltage-Threshold Levels table. They are available in 5- and 6-pin SOT23 packages and oper-ate over the extended (-40°C to +85°C) temperature range.
Features
●Precision Monitoring of Multiple +1.8V, +2.5V, +3.0V, +3.3V, and +5V Power-Supply Voltages●Precision Factory-Set Power-Supply Reset Thresholds●20μA Supply Current●100ms min Power-On-Reset Pulse Width●Debounced TTL/CMOS-Compatible Manual-Reset Input●Watchdog Timer • 46.4s Startup Timeout • 2.9s Normal Timeout●Fully Guaranteed Over Temperature●Guaranteed RESET Valid to VCC1 = 1V or VCC2 = 1V●Power-Supply Transient Immunity●No External Components for Dual-Voltage Systems●Small 5- and 6-Pin SOT23 Packages●Low Cost
Applications
Note: Standard versions are shown in bold. Sample stock is

generally held on the standard versions only. Contact factory for
availability.
*The _ _ are placeholders for the threshold voltage levels of
the devices. Substitute the part number suffix in the Voltage
Threshold Levels table for the desired voltage level. All devices
are available in tape-and-reel only. There is a 2500 piece
minimum order increment for the SOT package.
Devices are available in both leaded and lead(Pb)-free packag-
ing. Specify lead-free by replacing “-T” with “+T” when ordering.
Pin Configurations appear at end of data sheet.
Selector Guide appears at end of data sheet.
●Computers●Controllers●Portable/Battery- Powered Equipment●Intelligent Instruments●Multivoltage Systems
PART NO.
SUFFIX
(_ _)
VCC1 NOMINAL
VOLTAGE
THRESHOLD (V)
VCC2 NOMINAL
VOLTAGE
THRESHOLD (V)
4.633.084.632.93LR4.632.634.383.08MS4.382.934.382.633.082.323.082.193.081.67TV3.081.58SZ2.932.322.932.19SW2.931.672.931.58UW2.781.67UV2.781.58RW2.631.672.631.58
PARTTEMP RANGEPIN-PACKAGE
MAX6351_ _UT-T
-40°C to +85°C6 SOT23
MAX6352_ _UK-T
-40°C to +85°C5 SOT23
MAX6353_ _UK-T
-40°C to +85°C5 SOT23
MAX6354_ _UK-T
-40°C to +85°C5 SOT23
MAX6355_ _UT-T
-40°C to +85°C6 SOT23
MAX6356_ _UT-T
-40°C to +85°C6 SOT23
MAX6357_ _UT-T
-40°C to +85°C6 SOT23
MAX6358_ _UT-T
-40°C to +85°C6 SOT23
MAX6359_ _UT-T
-40°C to +85°C6 SOT23
MAX6360_ _UT-T
-40°C to +85°C6 SOT23
MAX6351–MAX6360Dual/Triple-Voltage μP Supervisory Circuits
Voltage Threshold Levels
Ordering Information
VCC1, VCC2 to GND ...............................................-0.3V to +6V
RST (MAX6352/MAX6355/MAX6358) ....................-0.3V to +6V
RST, MR, WDI, RST1, RSTIN (MAX6351/MAX6353/ MAX6356/MAX6359) ..........................-0.3V to (VCC1 + 0.3V)
RST, RST2 (MAX6351/MAX6354/ MAX6357/MAX6360) ..........................-0.3V to (VCC2 + 0.3V)
Input/Output Current, All Pins .............................................20mAContinuous Power Dissipation (TA = +70°C) 5-Pin SOT23 (derate 7.1mW/°C above +70°C) ..........571mW 6-Pin SOT23 (derate 8.7mW/°C above +70°C) ..........695mWOperating Temperature Range ...........................-40°C to +85°CJunction Temperature ......................................................+150°CStorage Temperature Range ............................-65°C to +150°C
(VCC1 = VCC2 = +1.2V to +5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

Supply Voltage (Note 2)VCC1, VCC2
TA = 0°C to +70°C1.05.5VTA = -40°C to +85°C1.25.5
Supply CurrentICC1 + ICC2 VCC1 = 5.5V, VCC2 = 3.6V, all I/O pins open2050µA
VCC1 Threshold (Note 3)VTH1
MAX63_ _L_TA = +25°C4.544.634.72
TA = -40°C to +85°C4.54.75
MAX63_ _M_TA = +25°C4.34.384.46
TA = -40°C to +85°C4.254.50
MAX63_ _T_TA = +25°C3.033.083.14
TA = -40°C to +85°C3.003.15
MAX63_ _S_TA = +25°C2.882.932.98
TA = -40°C to +85°C2.853.00
MAX63_ _U_TA = +25°C2.742.782.82
TA = -40°C to +85°C2.702.85
MAX63_ _R_TA = +25°C2.582.632.68
TA = -40°C to +85°C2.552.70
VCC2 Threshold (Note 3)VTH2
MAX63_ _ _TTA = +25°C3.033.083.14
TA = -40°C to +85°C3.003.15
MAX63_ _ _STA = +25°C2.882.932.98
TA = -40°C to +85°C2.853.00
MAX63_ _ _RTA = +25°C2.582.632.68
TA = -40°C to +85°C2.552.70
MAX63_ _ _ZTA = +25°C2.282.322.35
TA = -40°C to +85°C2.252.38
MAX63_ _ _YTA = +25°C2.162.192.22
TA = -40°C to +85°C2.132.25
MAX63_ _ _WTA = +25°C1.641.671.70
TA = -40°C to +85°C1.621.71
MAX63_ _ _VTA = +25°C1.551.581.61
TA = -40°C to +85°C1.531.62
MAX6351–MAX6360Dual/Triple-Voltage μP Supervisory Circuits
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
(VCC1 = VCC2 = +1.2V to +5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

Reset Threshold TempcoΔVTH/°C20ppm/°C
Reset Threshold HysteresisVTH/500V
VCC to Reset Delay100mV overdrive20µs
Reset Timeout PeriodtRPVCC1 > VTH1 (MAX), VCC2 > VTH2 (MAX)100180280ms
RESET Output Voltage LowVOL
VCC1 or VCC2 ≥ 2.7V, ISINK = 1.2mA0.3
VCC1 or VCC2 ≥ 4.5V, ISINK = 3.2mA0.4
VCC1 or VCC2 ≥ 1V, ISINK = 50µA,
TA = 0°C to +70°C0.3
VCC1 or VCC2 ≥ 1.2V, ISINK = 50µA;
TA = -40°C to +85°C0.3
RESET Output-Voltage High(MAX6351/MAX6353/MAX6354/MAX6356/MAX6357/MAX6359/MAX6360 only)VOH
(_W, _V versions only), VCC1 > VTH1(MAX), VCC2 > VTH2(MAX)ISOURCE = 350µA0.8 x VCC(_Y versions only), VCC1 > VTH1(MAX), VCC2 > VTH2(MAX)ISOURCE = 500µA0.8 x VCC
(_T, _S, _R versions only),VCC1 > VTH1(MAX), VCC2 > VTH2(MAX)ISOURCE = 800µAVCC - 1.5
WATCHDOG INPUT (MAX6358/MAX6359/MAX6360)

Watchdog Timeout PeriodtWDFirst timeout period after reset25.646.472.0sAfter irst WDI falling edge1.62.94.5
WDI Pulse Width (Note 4)tWDIVIL = 0.4V, VIH = 0.8 x VCC50ns
WDI Input Voltage (Note 5)VILVCC1 = 5V 0.3 x VCCVVIH0.65 x VCC
WDI Input Current (Note 6)VWDI = VCC120160VWDI = 0-20-15
MANUAL RESET INPUT

MR Input Voltage
VILMAX63_ _L_, MAX63_ _M_, VCC1 > VTH1(MAX)0.8VIHMAX63_ _L_, MAX63_ _M_, VCC1 > VTH1(MAX)2.3
VILMAX63_ _ _Y, VCC1 > VTH1(MAX)0.3 x VCC
VIHMAX63_ _ _Y, VCC1 > VTH1(MAX) 0.7 x VCC
MAX6351–MAX6360Dual/Triple-Voltage μP Supervisory Circuits
Electrical Characteristics (continued)
(VCC1 = VCC2 = +1.2V to +5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
Note 1:
Overtemperature limits are guaranteed by design and not production tested.
Note 2:
The reset output is guaranteed to be in the correct state if either VCC1 or VCC2 is within its specified region of operation.
Note 3:
The reset output(s) is asserted if either VCC1 or VCC2 drops below its associated trip point.
Note 4:
Guaranteed by design. Not production tested.
Note 5:
WDI is internally serviced within the watchdog timeout period if WDI is left unconnected.
Note 6:
The WDI input current is specified as the average input current when the WDI input is driven high or low.
(VCC1 = +5V, TA = +25°C, unless otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

MR Pullup Resistance3263.5100kΩ
MR Minimum Pulse WidthtRP1µs
MR Glitch Rejection100ns
MR to Reset DelaytMD0.1µs
ADJUSTABLE RESET COMPARATOR INPUT (MAX6355/MAX6356/MAX6357)

RSTIN Input ThresholdVRSTINVCC1 > VTH1(MAX), VCC2 > VTH2(MAX)
TA = +25°C1.201.221.24V
TA = -40°C to +85°C1.191.25
RSTIN Input CurrentIRSTIN0 < VRSTIN < VCC1 - 0.3V-2525nA
RSTIN Hysteresis2.5mV
VCC1 (V)
RESET vs. VCC1 (VCC2 > VTH2)

VTH
MAX6351/60-02
RESET (V)
MAX6356L_0
MAX6351/60-03
VCC1 (V)
RESET (V)
RESET vs. VCC1 (VCC2 = GND)

SUPPLY CURRENT vs. TEMPERATURE
MAX6351/60-01
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
ICC1 (VCC1 = 5.0V, VCC2 = 3.3V)
ICC2 (VCC1 = 5.0V, VCC2 = 3.3V)
ICC2 (VCC1 = 3.3V, VCC2 = 2.5V)
ICC1 (VCC1 = 3.3V, VCC2 = 2.5V)
MAX6351–MAX6360Dual/Triple-Voltage μP Supervisory Circuits
Electrical Characteristics (continued)
Typical Operating Characteristics
(VCC1 = +5V, TA = +25°C, unless otherwise noted.)
NORMALIZED RESET/WATCHDOG
PERIOD vs. TEMPERATURE
MAX6351/60-04
TEMPERATURE (°C)
NORMALIZED PERIOD
MAXIMUM VCC TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
MAX6351/60-05
RESET THRESHOLD OVERDRIVE, VRST - VCC (V)
TRANSIENT DURATION (µs)
RESET OCCURS ABOVE LINE
RESET DELAY vs.
RESET THRESHOLD OVERDRIVE
MAX6351/60-06
RESET THRESHOLD OVERDRIVE, VRST - VCC (V)
RESET DELAY (µs)
DELAY FROM FALL OF VCC1
DELAY FROM FALL OF VCC2
OPEN-DRAIN
OUTPUT
RST1 PUSH-PULL
OUTPUT
RST2 PUSH-PULL
OUTPUT
PULLUP CHARACTERISTICS

MAX6351/60-07
400ns/div
RPULLUP = 100kΩ
CLOAD = 10pF
MANUAL-RESET INPUT TO
OUTPUT DELAY

40ns/div
MAX6351/60-08
OPEN-DRAIN
OUTPUT
RST1 PUSH-PULL
OUTPUT
RST2 PUSH-PULL
OUTPUT
RPULLUP = 100kΩ
CLOAD = 10pF
MAX6351–MAX6360Dual/Triple-Voltage μP Supervisory Circuits
Typical Operating Characteristics (continued)
PIN
NAMEDESCRIPTIONMAX6351
MAX6352
MAX6353
MAX6354
MAX6355
MAX6356
MAX6357
MAX6358
MAX6359
MAX6360
———RST1Active-Low, CMOS Reset Output Referenced to VCC1111RST
Active-Low Reset Output. Open drain for the MAX6352/ MAX6355/MAX6358, push-pull with respect to VCC1 for the MAX6353/MAX6356/MAX6359, and push-pull with respect to VCC2 for the MAX6354/MAX6357/MAX6360.222GNDGround333MR
Manual-Reset Input. Pull low to force a reset. RST,
RST1, and RST2 remain active as long as MR is lowand for the timeout period after MR goes high.Leave unconnected or connect to VCC1 if unused.VMR must not exceed VCC1.444VCC2Supply Input. Powers the device when it is above VCC1 and monitors its own voltage.———RST2Active-Low, CMOS Reset Output Referenced to VCC2—5—RSTIN
Undervoltage-Reset Comparator Input. Asserts reset when the monitored voltage falls below 1.22V. Set the reset threshold with an external resistive divider. Connect to VCC1 if unused. VRSTIN must not exceed VCC1.——5WDI
Watchdog Input. If WDI remains either high or low longer than the timeout period, then reset is triggered. The timer clears when reset is asserted or whenever WDI sees a rising or falling edge. Leave unconnected to disable if unused.566VCC1Supply Input. Powers the device when it is above VCC2 and monitors its own voltage.
MAX6351–MAX6360Dual/Triple-Voltage μP Supervisory Circuits
Pin Description
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