MAX6381XR39D2+T ,SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset CircuitsFeaturesThe MAX6381–MAX6390 microprocessor (µP) supervisory ♦ Factory-Set Reset Threshold Voltages ..
MAX6382XR26D3+T ,SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset CircuitsFeaturesThe MAX6381–MAX6390 microprocessor (µP) supervisory ♦ Factory-Set Reset Threshold Voltages ..
MAX6382XR44D3+T ,SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset CircuitsELECTRICAL CHARACTERISTICS(V = full range, T = -40°C to +125°C, unless otherwise specified. Typical ..
MAX6383LT41D3+T ,SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset CircuitsApplications♦ Tiny 3-Pin/4-Pin SC70 and 6-Pin μ μDFN PackagesComputers Critical µP and µCOrdering I ..
MAX6383XR17D3+T ,SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset CircuitsApplications♦ Tiny 3-Pin/4-Pin SC70 and 6-Pin μ μDFN PackagesComputers Critical µP and µCOrdering I ..
MAX6383XR17D3-T ,1.67 V, 140 ms, SC70, single/dual low-voltage, low-power mP reset circuitFeaturesThe MAX6381–MAX6390 microprocessor (µP) supervisory Factory-Set Reset Threshold Voltages R ..
MB2245BB ,16-bit transceivers with direction pins 3-State
MB2245BB ,16-bit transceivers with direction pins 3-State
MB2374BB ,Dual octal D-type flip-flop; positive-edge trigger (3-State)
MB2374BB ,Dual octal D-type flip-flop; positive-edge trigger (3-State)
MB2374BB ,Dual octal D-type flip-flop; positive-edge trigger (3-State)
MB2543BB ,Dual octal latched transceivers with dual enable 3-State
MAX6381XR18D2-MAX6381XR23D3+T-MAX6381XR39D2+T-MAX6382XR26D3+T-MAX6382XR44D3+T -MAX6383LT41D3+T-MAX6383XR17D3+T-MAX6383XR46D2-MAX6384XS46D3+T-MAX6386XS22D3+T-MAX6386XS26D2+T-MAX6386XS26D3-MAX6386XS29D3+T-MAX6386XS31D3-MAX6387XS28D2+T-MAX6389XS31D1/V+T-MAX6389XS31D2+T-MAX6390XS2
SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset Circuits
General DescriptionThe MAX6381–MAX6390 microprocessor (µP) supervisory
circuits monitor power-supply voltages from +1.8V to
+5.0V while consuming only 3µA of supply current at
+1.8V. Whenever VCCfalls below the factory-set reset
thresholds, the reset output asserts and remains assert-
ed for a minimum reset timeout period after VCCrises
above the reset threshold. Reset thresholds are available
from +1.58V to +4.63V, in approximately 100mV incre-
ments. Seven minimum reset timeout delays ranging
from 1ms to 1200ms are available.
The MAX6381/MAX6384/MAX6387 have a push-pull
active-low reset output. The MAX6382/MAX6385/
MAX6388 have a push-pull active-high reset output,
and the MAX6383/MAX6386/MAX6389/MAX6390
have an open-drain active-low reset output. The
MAX6384/MAX6385/MAX6386 also feature a
debounced manual reset input (with internal pullup
resistor). The MAX6387/MAX6388/MAX6389 have an
auxiliary input for monitoring a second voltage. The
MAX6390 offers a manual reset input with a longer VCC
reset timeout period (1120ms or 1200ms) and a shorter
manual reset timeout (140ms or 150ms).
The MAX6381/MAX6382/MAX6383 are available in
3-pin SC70 and6-pinµDFNpackages and the
MAX6384–MAX6390 are available in 4-pin SC70 and
6-pin µDFN packages.
FeaturesFactory-Set Reset Threshold Voltages Ranging
from +1.58V to +4.63V in Approximately 100mV
Increments±2.5% Reset Threshold Accuracy Over
Temperature (-40°C to +125°C)Seven Reset Timeout Periods Available: 1ms,
20ms, 140ms, 280ms, 560ms, 1120ms,
1200ms (min)3 Reset Output Options
Active-Low Push-Pull
Active-High Push-Pull
Active-Low Open-DrainReset Output State Guaranteed Valid
Down to VCC= 1VManual Reset Input (MAX6384/MAX6385/MAX6386)Auxiliary RESETIN (MAX6387/MAX6388/MAX6389)VCCReset Timeout (1120ms or 1200ms)/Manual
Reset Timeout (140ms or 150ms) (MAX6390)Negative-Going VCCTransient ImmunityLow Power Consumption of 6μμA at +3.6V
and 3μμA at +1.8V
Pin Compatible with
MAX809/MAX810/MAX803/MAX6326/MAX6327/
MAX6328/MAX6346/MAX6347/MAX6348,
and MAX6711/MAX6712/MAX6713Tiny 3-Pin/4-Pin SC70 and 6-Pin μμDFN
Packages
MAX6381–MAX6390
SC70/µDFN, Single/Dual Low-Voltage,
Low-Power µP Reset CircuitsRESET
(RESET)
3VCC
GND
MAX6381
MAX6382
MAX6383
TOP VIEW
SC70
( ) IS FOR MAX638234
GNDVCCN.C.
N.CN.C.
MAX6381
MAX6382
MAX6383
µDFN
RESET
(RESET)
PARTTEMP RANGEPIN-
PACKAGE
MAX6381LT_ _D_+T-40°C to +125°C6 µDFN
MAX6381XR_ _D_+T-40°C to +125°C3 SC70AX 6381X R_ _D _/V + T-40°C to +125°C3 SC70
MAX6382LT_ _D_+T-40°C to +125°C6 µDFN
MAX6382XR_ _D_+T-40°C to +125°C3 SC70
Pin Configurations19-1839; Rev 5; 7/12
Ordering Information
Ordering Information continuedat end of data sheet.
Note:Insert reset threshold suffix (see Reset Threshold table)
after "XR", "XS", or "LT." Insert reset timeout delay (see Reset
Timeout Delay table) after "D" to complete the part number.
Sample stock is generally held on standard versions only (see
Standard Versions table). Standard versions have an order
increment requirement of 2500 pieces. Nonstandard versions
have an order increment requirement of 10,000 pieces.
Contact factory for availability of nonstandard versions.
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
Computers
Controllers
Intelligent Instruments
Critical µP and µC
Power Monitoring
Portable/Battery-
Powered Equipment
Dual Voltage Systems
Applications
MAX6381–MAX6390
SC70/µDFN, Single/Dual Low-Voltage,
Low-Power µP Reset Circuits
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= full range, TA= -40°C to +125°C, unless otherwise specified. Typical values are at TA= +25°C.) (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.
VCC to GND..........................................................-0.3V to +6.0V
RESETOpen-Drain Output....................................-0.3V to +6.0V
RESET, RESET (push-pull output)..............-0.3V to (VCC+ 0.3V)
MR, RESET IN.............................................-0.3V to (VCC+ 0.3V)
Input Current (VCC).............................................................20mA
Output Current (all pins).....................................................20mA
Continuous Power Dissipation (TA= +70°C)
3-Pin SC70 (derate 2.9mW/°C above +70°C)..............235mW
4-Pin SC70 (derate 3.1mW/°C above +70°C)..............245mW
6-Pin µDFN (derate 2.1mW/°C above +70°C)..........167.7mW
Operating Temperature Range.........................-40°C to +125°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
Soldering Temperature (reflow).......................................+260°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSOperating Voltage RangeVCC1.05.5V
VCC = 5.5V, no load713
VCC = 3.6V, no load611
VCC = 2.5V, no load47VCC Supply CurrentICC
VCC = 1.8V, no load36
TA = +25°CVTH -
1.5%VTHVTH +
1.5%VCC Reset Threshold
(See Reset Thresholds table)VTH
TA = -40°C to +125°CVTH -
2.5%VTHVTH +
2.5%
Reset Threshold Tempco∆VTH/°C60ppm/°C
VCC to Reset DelayVCC falling at 10mV/µs from VTH + 100mV
to VTH - 100mV35µs122040140280280560560112011202240
Reset Timeout Period
MAX6381–MAX6389
(See Reset Timeout table)
tRP12002400140280MR timeout periodD715030011202240
Reset Timeout Period
MAX6390tRP
VCC timeout periodD712002400
VIL0.3 x
VCC
VIH
VTH < 4V
0.7 x
VCC
VIL0.8
MR Input VoltageVTH > 4V
MAX6381–MAX6390
SC70/µDFN, Single/Dual Low-Voltage,
Low-Power µP Reset Circuits
ELECTRICAL CHARACTERISTICS (continued)(VCC= full range, TA= -40°C to +125°C, unless otherwise specified. Typical values are at TA= +25°C.) (Note 1)
Note 1:Specifications over temperature are guaranteed by design, not production tested.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSMR Minimum Input Pulse Width1µs
MR Glitch Rejection100ns
MR to Reset Delay200ns
MAX6381–MAX63893263100kΩMR Internal Pullup ResistanceMAX639050015603000Ω
TA = +25°C1.2451.271.295
TA = 0°C to +85°C1.2321.308RESET IN Input ThresholdVTHRST
TA = -40°C to +125°C1.2191.321
RESET IN to RESET DelayVRESETIN falling at 4mV/µs from
VTHRST + 40mV to VTHRST - 40mV4.5µs
RESET IN Input Leakage CurrentIRESET IN-50±1+50nA
VCC ≥ 4.5V, ISINK = 3.2mA, reset asserted0.4
VCC ≥ 2.5V, ISINK = 1.2mA, reset asserted0.3Open-Drain RESET Output
VoltageVOL
VCC ≥ 1.0V, ISINK = 80µA, reset asserted0.3
Open-Drain RESET Output
Leakage CurrentILKGVCC > VTH, RESET not asserted1.0µA
VCC ≥ 4.5V, ISINK = 3.2mA, reset asserted0.4
VCC ≥ 2.5V, ISINK = 1.2mA, reset asserted0.3VOL
VCC ≥ 1.0V, ISINK = 80µA, reset asserted0.3
VCC ≥ 4.5V, ISOURCE = 800µA, reset not
asserted
0.8 x
VCC
Push-Pull RESET Output Voltage
VOHVCC ≥ 2.5V, ISOURCE = 500µA, reset not
asserted
0.8 x
VCC
VCC ≥ 4.5V, ISOURCE = 800µA, reset asserted0.8 x
VCC
VCC ≥ 2.5V, ISOURCE = 500µA, reset asserted0.8 x
VCC
VCC ≥ 1.8V, ISOURCE = 150µA, reset asserted0.8 x
VCC
VOH
VCC ≥ 1.0V, ISOURCE = 1µA, reset asserted0.8 x
VCC
VCC ≥ 4.5V, ISINK = 3.2mA, reset not
asserted0.4
Push-Pull RESET Output Voltage
VOL
VCC ≥ 2.5V, ISINK = 1.2mA, reset not
asserted0.3
MAX6381–MAX6390
SC70/µDFN, Single/Dual Low-Voltage,
Low-Power µP Reset Circuits
Typical Operating Characteristics(TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
(NO LOAD)
AX6381/90 toc01
TEMPERATURE (°C)
SUPPLY CURRENT (
VCC = +1.8VVCC = +2.5V
VCC = +3.6VVCC = +5.5V
POWER-DOWN RESET DELAY
vs. TEMPERATURE
AX6381/90 toc02
TEMPERATURE (°C)
POWER-DOWN RESET DELAY (
VCC = +1.8V
VCC = +3V
NORMALIZED POWER-UP RESET TIMEOUT
vs. TEMPERATURE
AX6381/90 toc03
TEMPERATURE (°C)
NOR
ALIZED RESET TI
EOUT PERIOD
AX6381/90 toc04
TEMPERATURE (°C)
NOR
ALIZED RESET THRESHOLD
NORMALIZED RESET THRESHOLD
vs. TEMPERATUREOUTPUT-VOLTAGE LOW
vs. SINK CURRENT
AX6381/90 toc05
ISINK (mA)
(V)
VCC = +3.0V
VCC = +4.5V
OUTPUT-VOLTAGE HIGH
vs. SOURCE CURRENT
AX6381/90 toc06
ISOURCE (μA)
(V)
VCC = +2.5V
VCC = +1.8V
MAXIMUM TRANSIENT DURATION
vs. RESET COMPARATOR OVERDRIVE
AX6381/90 toc07
AXI
TRANSIENT DURATION (
RESET ASSERTED
ABOVE THIS LINE
RESET IN TO RESET DELAY
vs. TEMPERATURE
AX6381/90 toc08
RESET IN DELAY (
MAX6381–MAX6390
SC70/µDFN, Single/Dual Low-Voltage,
Low-Power µP Reset Circuits
Pin Description
PIN
3-PIN SC704-PIN SC70
µDFNMAX6381/
MAX6383MAX6382
MAX6384/
MAX6386/
MAX6390
MAX6385MAX6387/
MAX689MAX6388
NAMEFUNCTION (MAX6382/
MAX6385/
MAX6388)—2—2RESET
Active-High Push-Pull Reset Output.
RESET changes from low to high when
any monitored voltage (VCC or
VRESETIN) drops below the reset
threshold or MR is pulled low. RESET
remains high for the reset timeout
period after monitored voltages exceed
the reset thresholds or MR is released.
(MAX6381/
MAX6383/
MAX6384/
MAX6386/
MAX6387/
MAX6390)2—2—RESET
Acti ve- Low Op en- D r ai n/P ush- P ul l Reset
Outp ut. RE S E T chang es fr om hi g h to l ow hen any m oni tor ed vol tag e ( V C C or RE S E TIN ) d r op s b el ow the r eset thr eshol d
or M R i s p ul l ed l ow . RE S E T r em ai ns l ow for
the r eset ti m eout p er i od after the m oni tor ed
vol tag es exceed the r eset thr eshol d s or M Rs r el eased . O p en- d r ai n r eq ui r es an
exter nal p ul l up r esi stor .
2, 3, 5
(MAX6381/
MAX6382/
MAX6383)
2, 5
(MAX6384–
MAX6390)—————N.C.No Connection. Not Internally
connected.
(MAX6384/
MAX6385/
MAX6386/
MAX6390)33——MR
Active-Low Manual Reset Input. Drive
low to force a reset. Reset remains
active as long as MR is low and for the
reset timeout period after MR is
released. Leave unconnected or
connect to VCC if unused. MR has an
internal 63kΩ (1.56kΩ for MAX6390)
pullup resistor to VCC.
(MAX6387/
MAX6388/
MAX6389)——33RESET
Auxi l i ar y Reset Inp ut. H i g h- i m p ed ancenp ut to the auxi l i ar y r eset com p ar ator .onnect RE S E T IN to the center p oi nt of
an exter nal r esi stor vol tag e- d i vi d er
netw or k to set the r eset thr eshol d vol tag e.
Reset asser ts w hen ei ther V C C or RE S E T
IN fal l s b el ow i ts thr eshol d vol tag e.
(MAX6381–
MAX6390)4444VCCSupply Voltage for the device and input
for fixed VCC reset threshold monitor.
MAX6381–MAX6390
SC70/µDFN, Single/Dual Low-Voltage,
Low-Power µP Reset Circuits
Detailed Description
RESET OutputA µP reset input starts the µP in a known state. These
µP supervisory circuits assert reset to prevent code
execution errors during power-up, power-down, or
brownout conditions.
Reset asserts when VCCis below the reset threshold;
once VCCexceeds the reset threshold, an internal timer
keeps the reset output asserted for the reset timeout
period. After this interval, reset output deasserts. Reset
output is guaranteed to be in the correct logic state for
VCC≥1V.
Manual Reset Input (MAX6384/
MAX6385/MAX6386/MAX6390)Many µP-based products require manual reset capabil-
ity, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. A logic low on MR
asserts reset. Reset remains asserted while MRis low,
and for the reset active timeout period (tRP) after MR
returns high. This input has an internal 63kΩpullup
resistor (1.56kΩfor MAX6390), so it can be left uncon-
nected if it is not used. MRcan be driven with TTL or
CMOS logic levels, or with open-drain/collector outputs.
Connect a normally open momentary switch from MRto
GND to create a manual-reset function; external
debounce circuitry is not required. If MRis driven from
long cables or if the device is used in a noisy environ-
ment, connecting a 0.1µF capacitor from MRto GND
provides additional noise immunity.
RESET IN Comparator
(MAX6387/MAX6388/MAX6389)RESET IN is compared to an internal +1.27V reference.
If the voltage at RESET IN is less than 1.27V, reset
asserts. Use the RESET IN comparator as a user-
adjustable reset detector or as a secondary power-sup-
ply monitor by implementing a resistor-divider at RESET
IN (shown in Figure 1). Reset asserts when either VCC
or RESET IN falls below its respective threshold volt-
age. Use the following equation to set the threshold:
VINTH= VTHRST (R1/R2 + 1)
where VTHRST= +1.27V. To simplify the resistor selec-
tion, choose a value of R2 and calculate R1:
R1 = R2 [(VINTH/VTHRST) - 1]
Since the input current at RESET IN is 50nA (max),
large values can be used for R2 with no significant loss
in accuracy.
___________Applications Information
Negative-Going VCCTransientsIn addition to issuing a reset to the µP during power-up,
power-down, and brownout conditions, the
MAX6381–MAX6390 are relatively immune to short dura-
tion negative-going VCCtransients (glitches).
The Typical Operating Characteristicssection shows the
Maximum Transient Durations vs. Reset Comparator
Overdrive, for which the MAX6381–MAX6390 do not
Reset Thresholds (-40°C to +125°C)
SUFFIXVTH (min)VTH (nom)VTH (max)4.514.634.744.394.504.614.274.384.484.194.304.414.104.204.314.004.104.203.904.004.103.803.904.003.713.803.903.613.703.793.513.603.693.413.503.593.323.403.493.223.303.383.123.203.283.003.083.152.933.003.082.852.933.002.732.802.872.632.702.772.562.632.692.442.502.562.342.402.462.262.312.372.132.192.242.052.102.151.952.002.051.851.901.951.761.801.851.621.671.711.541.581.61
