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MAX6801UR29D3+T |MAX6801UR29D3TMAXIMN/a9455avai3-Pin, Low-Power µP Reset Circuits
MAX6801UR44D3+T |MAX6801UR44D3TMAXIMN/a5000avai3-Pin, Low-Power µP Reset Circuits
MAX6802UR29D3+TMAIXMN/a2500avai3-Pin, Low-Power µP Reset Circuits


MAX6801UR29D3+T ,3-Pin, Low-Power µP Reset CircuitsApplications PART TEMP RANGE PIN-PA CK A G EComputers3 SOT23MAX6800UR_ _D_-T -40°C to +125°CContro ..
MAX6801UR44D3+T ,3-Pin, Low-Power µP Reset CircuitsFeaturesThe MAX6800/MAX6801/MAX6802 microprocessor (µP)♦ Ultra-Low 0.7V Operating Supply Voltagesup ..
MAX6802UR29D3+T ,3-Pin, Low-Power µP Reset CircuitsELECTRICAL CHARACTERISTICS(V = full range, T = -40°C to +125°C, unless otherwise noted. Typical val ..
MAX6804US29D3+T ,4-Pin, Low-Power µP Reset Circuits with Manual ResetFeaturesThe MAX6803/MAX6804/MAX6805 microprocessor (µP) ● Ultra-Low 0.7V Operating Supply Voltagesu ..
MAX6804US29D3-T ,2.93 V, low-power mP reset circuit with manual resetApplications Ordering InformationComputersPART* TEMP. RANGE PIN-PACKAGEControllers MAX6803US_ _D_-T ..
MAX6804US44D3+T ,4-Pin, Low-Power µP Reset Circuits with Manual ResetApplicationsMAX6805US_ _D_-T -40°C to +125°C 4 SOT143● Computers*These devices are available in fac ..
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MAX6801UR29D3+T-MAX6801UR44D3+T-MAX6802UR29D3+T
3-Pin, Low-Power µP Reset Circuits
General Description
The MAX6800/MAX6801/MAX6802 microprocessor (µP)
supervisory circuits monitor the power supplies in 2.85V
to 5.0V µP and digital systems. They increase circuit
reliability and reduce cost by eliminating external com-
ponents and adjustments.
These devices perform a single function—they assert a
reset signal whenever the VCCsupply voltage declines
below a preset threshold, keeping it asserted for a preset
timeout period after VCChas risen above the reset
threshold. The only difference among the three devices
is their output. The MAX6801 (push/pull) and MAX6802
(open-drain) have an active-low RESEToutput, while the
MAX6800 (push/pull) has an active-high RESET output.
The MAX6800/MAX6801 are guaranteed to be in the cor-
rect state for VCCdown to 0.7V. The MAX6802 is guaran-
teed to be in the correct state for VCCdown to 1.0V.
The reset comparator in these ICs is designed to ignore
fast transients on VCC. Reset thresholds are factory-
trimmable between 2.63V and 4.80V, in approximately
100mV increments. These devices are available with a
1ms (min), 20ms (min), or 100ms (min) reset pulse
width. Ideal for space-critical applications, the
MAX6800/MAX6801/MAX6802 come packaged in a 3-
pin SOT23. For a lower threshold voltage version, see
the MAX6332/MAX6333/MAX6334.
Applications

Computers
Controllers
Intelligent Instruments
Critical µP/µC Power Monitoring
Portable/Battery-Powered Equipment
Automotive
Features
Ultra-Low 0.7V Operating Supply VoltageLow 4.0µA Supply CurrentPrecision Monitoring of 2.85V to 5.0V Power-
Supply Voltages
Reset Thresholds Available from 2.63V to 4.80V,
in Approximately 100mV Increments
Fully Specified over TemperatureThree Power-On Reset Timeout Periods Available
(1ms min, 20ms min, 100ms min)
Low CostThree Available Output Structures: Push/Pull
RESET, Push/Pull RESET, Open-Drain RESET
Guaranteed RESET/RESETValid to VCC= 0.7V
(MAX6800/MAX6801)
Power-Supply Transient ImmunityNo External Components Required3-Pin SOT23 PackagePin Compatible with MAX809/MAX810,
MAX6326/MAX6327/MAX6328, and
MAX6346/MAX6347/MAX6348
MAX6800/MAX6801/MAX6802
3-Pin, Low-Power
µP Reset Circuits
Ordering Information

*These devices are available in factory-set VCCreset thresh-
olds from 2.63V to 4.80V, in approximately 0.1V increments.
Choose the desired reset threshold suffix from Table 1 and
insert it in the blanks following “UR” in the part number.
Factory-programmed reset timeout periods are also available.
Insert the number corresponding to the desired nominal reset
timeout period (1 = 1ms min, 2 = 20ms min, 3 = 100ms min) in
the blank following “D” in the part number. There are 15 stan-
dard versions with a required order increment of 2500 pieces.
Sample stock is generally held on the standard versions only
(see Selector Guide). Contact the factory for availability of non-
standard versions (required order increment is 10,000 pieces).
All devices available in tape-and-reel only.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
Typical Operating Circuit and Pin Configuration appear
at end of data sheet.
Selector Guide appears at end of data sheet.

19-1933; Rev 4; 3/12PART TEMP RANGE PIN- PA CK A G E
MAX6800UR_ _D_-T
-40°C to +125°C3 SOT23
MAX6800UR_ _D_/V-T-40°C to +125°C3 SOT23
MAX6801UR_ _D_-T
-40°C to +125°C3 SOT23
MAX6801UR_ _ D_/V-T-40°C to +125°C3 SOT23
MAX6802UR_ _D_-T
-40°C to +125°C3 SOT23
MAX6802UR_ _ D_/V-T-40°C to +125°C3 SOT23
MAX6800/MAX6801/MAX6802
3-Pin, Low-Power
µP Reset Circuits
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VCC= full range, TA= -40°C to +125°C, unless otherwise noted. Typical values are at VCC= +5.0V and TA= +25°C, reset not
asserted.) (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 Voltage (with respect to GND)
VCC......................................................................-0.3V to +6V
Push/Pull RESET, RESET.......................-0.3V to (VCC+ 0.3V)
Open-Drain RESET..............................................-0.3V to +6V
Input Current (VCC).............................................................20mA
Output Current (RESET, RESET).........................................20mA
Continuous Power Dissipation (TA= +70°C)
3-Pin SOT23 (derate 4mW/°C above +70°C)..............320mW
Operating Temperature Range.........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
Soldering Temperature (reflow).......................................+300°C
Lead (Pb)-free packages............................................+260°C
Package containing lead (Pb).....................................+240°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

MAX6800/MAX68010.75.5TA = 0°C to +125°CMAX68021.05.5
MAX6800/MAX68010.785.5
Supply Voltage Range
(Note 2)VCC
TA = -40°C to +125°CMAX68021.25.5
VCC = +3.0V410Supply CurrentICCNo loadVCC = +5.0V512µA
TA = +25°CVTH
- 1.8%VTHVTH
+ 1.8%
Reset ThresholdVTHMAX680_UR_ _D_-T,
Table 1
TA = - 40°C to + 125°C VTH
- 3%VTHVTH
+ 3%
VCC Falling Reset DelayVCC falling at 10V/ms30µs
MAX680_UR_ _D1-T11.52
MAX680_UR_ _D2-T203040Reset Active Timeout PeriodtRP
MAX680_UR_ _D3-T100150200
ISINK = 50µA, VCC ≥ 1.0V0.4
ISINK = 1.2mA, VCC ≥ 2.5V0.3RESET Output Low Voltage
(MAX6801/MAX6802)VOLReset
asserted
ISINK = 1.2mA, VCC ≥ 4.25V0.4
IS OU RC E = 500µA, V C C ≥ 3.0V 0.8 x V C C RESET Output High Voltage
(MAX6801)VOHReset not
assertedIS OU RC E = 800µA, V C C ≥ 5.0V 0.8 x V C C
ISOURC E = 1µA, VCC ≥ 1.0V 0.8 x V C C
ISOURC E = 200µA, V CC ≥ 1.8V 0.8 x V C C VOHReset
asserted
ISOURC E = 800µA, V CC ≥ 4.25V 0.8 x V C C
ISINK = 1.2mA, V CC ≥ 3.0V 0.3
RESET Output Voltage
(MAX6800)
VOLReset not
assertedISINK = 3.2mA, V CC ≥ 5.0V 0.4
RESET Output Leakage Current
(MAX6802)VCC > VTH, RESET not asserted0.5µA
Note 1:
All parts are production tested at TA= +25°C. Overtemperature limits are guaranteed by design and not production tested.
Note 2:
ISOURCEfor the MAX6800 is I00nA. ISINKfor the MAX6801 is 100nA. ISINKfor the MAX6802 is 50µA.
3-Pin, Low-Power
µP Reset Circuits

SUPPLY CURRENT vs. TEMPERATURE
MAX6800/01/02 toc01
TEMPERATURE (°C)
ICC
VCC = +5.0V
VCC = +3.3V
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE
MAX6800/01/02 toc02
TEMPERATURE (°C)
NORMALIZED RESET TIMEOUT PERIOD
VCC FALLING PROPAGATION DELAY
vs. TEMPERATURE
MAX6800/01/02 toc06
TEMPERATURE (°C)
PROPAGATION DELAY (
VCC = FALLING AT 1V/ms
VCC = FALLING AT 10V/ms
MAXIMUM TRANSIENT DURATION
vs. RESET COMPARATOR OVERDRIVE
MAX6800/01/02 toc05
RESET COMPARATOR OVERDRIVE (mV)
MAXIMUM TRANSIENT DURATION (
RESET OCCURS
RESET DOES
NOT OCCUR
RESET (VOH)
vs. SUPPLY VOLTAGE
MAX6800/01/02 toc04
VCC (V)
OUTPUT VOLTAGE HIGH (V
- V
) (mV)
TA = +25°C
TA = -40°C
TA = +125°C
TA = +85°C
VTH = 2.93V
ISOURCE = 100µA
RESET ASSERTED
(MAX6800)
RESET (VOL)
vs. SUPPLY VOLTAGE
VCC (V)
OUTPUT VOLTAGE LOW (mV)
TA = +125°C
TA = +85°C
TA = +25°C
TA = -40°C
VTH = 2.93V
ISINK = 500µA
RESET ASSERTED
MAX6801/MAX6802
Typical Operating Characteristics

(Reset not asserted, TA= +25°C, unless otherwise noted.)
MAX6800/MAX6801/MAX6802
Pin Description
PIN
NAMEFUNCTION
MAX6800MAX6801/
MAX6802
1GNDGround2RESET
Active-Low Reset Output. RESETis asserted while VCCis below the reset
threshold and remains asserted for a reset timeout period (tRP) after VCC
rises above the reset threshold. RESETon the MAX6801 is push/pull.
RESETon the MAX6802 is open-drain.—RESET
Active-High Reset Output. RESET is asserted while VCCis below the reset
threshold and remains asserted for a reset timeout period (tRP) after VCC
rises above the reset threshold. RESET on the MAX6800 is push/pull.3VCCSupply Voltage Input
MAX6800/MAX6801/MAX6802
3-Pin, Low-Power
µP Reset Circuits

VCC
VCC
GND
MAX6802
RESET
VCC
GND
RESET
MOTOROLA
68HCXX100kΩ
Applications Information
Interfacing to µPs with Bidirectional
Reset Pins

Since the RESEToutput on the MAX6802 is open-drain,
this device interfaces easily with µPs that have bidirec-
tional reset pins, such as the Motorola 68HC11.
Connecting the µP supervisor’s RESEToutput directly
to the microcontroller’s (µC’s) RESETpin with a single
pullup resistor allows either device to assert reset
(Figure 1).
Negative-Going VCCTransients

In addition to issuing a reset to the µP during power-up,
power-down, and brownout conditions, these devices are
relatively immune to short-duration, negative-going VCC
transients (glitches). The Typical Operating Characteristics
show the Maximum Transient Duration vs. Reset
Comparator Overdrive graph. The graph shows the maxi-
mum pulse width that a negative-going VCC transient may
typically have without issuing a reset signal. As the ampli-
tude of the transient increases, the maximum allowable
pulse width decreases.
Figure 1. Interfacing to µPs with Bidirectional Reset Pins
TOP VIEWVCC
RESET (RESET)
MAX6800
MAX6801
MAX6802
SOT23-3

( ) ARE FOR MAX6800
GND
Pin Configuration

Figure 2. Ensuring Reset Valid Down to VCC= 0V
VCC
GND
MAX6801
RESET
100kΩ
(a)

VCC
GND
MAX6800
RESET
100kΩ*
(b)

*ASSUMES HIGH-Z RESET INPUT TO THE μP
MAX6801
VCC
VCC
RESETRESET
GND
VCC
GNDypical Operating Circuit
3-Pin, Low-Power
µP Reset Circuits
MAX6800/MAX6801/MAX6802
Table 1. Factory-Trimmed Reset Thresholds
TA = +25°
°°°CTA = -40°°°°C to +125°°°°CRESET
THRESHOLD
SUFFIXMINTYP (VTH)MAXMINMAX
4.7144.804.8864.6564.9444.6154.704.7854.5594.8414.5474.634.7134.4914.7694.4194.504.5814.3654.6354.3014.384.4594.2494.5114.2234.304.3774.1714.4294.1244.204.2764.0744.3264.0264.104.1743.9774.2233.9284.004.0723.8804.1203.8303.903.9703.7834.0173.7323.803.8683.6863.9143.6333.703.7673.5893.8113.5353.603.6653.4923.7083.4373.503.5633.3953.6053.3393.403.4613.2983.5023.2413.303.3593.2013.3993.1423.203.2583.1043.2963.0253.083.1352.9883.1722.9463.003.0542.9103.0902.8772.932.9832.8423.0182.7502.802.8502.7162.8842.6512.702.7492.6192.7812.5832.632.6772.5512.709
Ensuring a Valid Reset Output
Down to VCC= 0V

When VCCfalls below 1V and approaches the minimum
operating voltage of 0.7V, push/pull-structured reset
sinking (or sourcing) capabilities decrease drastically.
High-impedance CMOS-logic inputs connected to the
RESETpin can drift to indeterminate voltages. This
does not present a problem in most cases, since most
µPs and circuitry do not operate when VCCdrops
below 1V. For the MAX6801 application, where RESET
must be valid down to 0V, adding a pulldown resistor
between RESETand GND removes stray leakage cur-
rents, holding RESETlow (Figure 2a). The pulldown
resistor value is not critical; 100kΩis large enough not
to load RESETand small enough to pull it low. For the
MAX6800 application, where RESET must be valid to
VCC= 0V, a 100kΩpullup resistor between RESET and
VCCwill hold RESET high when VCCfalls below 0.7V
(Figure 2b).
Since the MAX6802 has an open-drain, active-low out-
put, it typically uses a pullup resistor. With this device,
RESETwill most likely not maintain an active condition,
but will drift to a non-active level due to the pullup
resistor and the reduced sinking capability of the open-
drain device. Therefore, this device is not recommend-
ed for applications where the RESETpin is required to
be valid down to VCC= 0V.
PROCESS: BiCMOS
Chip Information
MAX6800/MAX6801/MAX6802
3-Pin, Low-Power
µP Reset Circuits

*Sample stock is generally held on all standard versions.
Selector Guide (Standard Versions*)
PARTOUTPUT STAGENOMINAL VTH (V)MIN RESET
TIMEOUT (ms)
SOT
TOP MARK

MAX6800UR26D3-TPush/Pull RESET2.63100FZIE
MAX6800UR29D3-TPush/Pull RESET2.93100FZIF
MAX6800UR31D3-TPush/Pull RESET3.08100FZIG
MAX6800UR44D3-TPush/Pull RESET4.38100FZIH
MAX6800UR46D3-TPush/Pull RESET4.63100FZII
MAX6801UR26D3-TPush/Pull RESET2.63100FZIK
MAX6801UR29D3-TPush/Pull RESET2.93100FZIM
MAX6801UR31D3-TPush/Pull RESET3.08100FZIN
MAX6801UR44D3-TPush/Pull RESET4.38100FZIO
MAX6801UR46D3-TPush/Pull RESET4.63100FZIP
MAX6802UR26D3-TOpen-Drain RESET2.63100FZIQ
MAX6802UR29D3-TOpen-Drain RESET2.93100FZIR
MAX6802UR31D3-TOpen-Drain RESET3.08100FZIS
MAX6802UR44D3-TOpen-Drain RESET4.38100FZIT
MAX6802UR46D3-TOpen-Drain RESET4.63100FZIU
Package Information

For the latest package outline information and land patterns
(footprints), go to /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.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.

3 SOT23U3-121-005190-0179
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