Download MAX6381XR25D1+T中文资料

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MAX6381XR25D1+T 中文资料
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19-1839; Rev 4; 4/07
SC70/?DFN, Single/Dual Low-Voltage,
Low-Power ?P Reset Circuits
General Description
Features
The MAX6381–MAX6390 microprocessor (?P) supervisorycircuits monitor power-supply
voltages from
1.8V to?Factory-Set Reset Threshold Voltages Rangingfrom
1.58V to
4.63V in Approximately 100mV 5.0V while consuming only 3?A of supply current
atIncrements
1.8V.
Whenever VCCfalls below the factory-set resetthresholds, the reset output
asserts and remains assert-?±2.5% Reset Threshold Accuracy Overed for a minimum
reset timeout period after VTemperature (-40°C to
125°C)above the reset threshold.
Reset thresholds are availableCCrises?Seven Reset Timeout Periods Available:
1ms,from
1.58V to
4.63V, in approximately 100mV incre-20ms, 140ms, 280ms, 560ms,
1120ms, ments. Seven minimum reset timeout delays ranging1200ms (min)from 1ms to
1200ms are available.
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?3 Reset Output Options
The
have
MAX6381/MAX6384/MAX6387http://doc.docsou.com/be5fe575faabfe0f599aa5426.html
a
push-pullActive-Low
Push-Pullactive-low
reset
output.
The
MAX6382/MAX6385/Active-High Push-PullMAX6388 have a push-pull active-high reset
output,Active-Low Open-Drain
and the MAX6383/MAX6386/MAX6389/MAX6390 have an open-drain active-low reset output.
The?Reset Output State Guaranteed Valid Down to VMAX6384/MAX6385/MAX6386 also
feature aCC= 1V
debounced
manual
reset
input
(with
internal
pullup?Manual
Reset
Input
(MAX6384/MAX6385/MAX6386)resistor). The MAX6387/MAX6388/MAX6389 have an?Auxiliary
RESETauxiliary input for monitoring a second voltage. The(MAX6387/MAX6388/MAX6389)
IN
MAX6390 offers a manual reset input with a longer Vreset timeout period (1120ms or
1200ms) and a shorterCC?VCCReset Timeout (1120ms or 1200ms)/ManualReset Timeout
(140ms or 150ms) (MAX6390)manual reset timeout (140ms or 150ms).
The
MAX6381/MAX6382/MAX6383
are
available
in
?Negative-Going
VCCTransient
Immunity3-http://doc.docsou.com/be5fe575faabfe0f599aa5426.htmlpin
and6-pin?DFNpackages and the?Low Power Consumption of 6?A at
3.6V MAX6384–MAX6390
are available in 4-pin SC70 and
and 3?A at
1.8V?Pin Compatible with
MAX809/MAX810/MAX803/MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348,
ComputersCritical ?P and ?Cand MAX6711/MAX6712/MAX6713
SC70
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Controllers
Power Monitoring?Tiny 3-Pin/4-Pin SC70 and 6-Pin ?DFNPackages
Intelligent Instruments
Portable/Battery-Powered EquipmentOrdering Information
Dual Voltage Systems
Pin Configurations
after "XR", "XS", or "LT." Insert reset timeout delay (see ResetTimeout Delay table)
after "D" to complete the part number.Sample stock is generally held on standard
versions only (seeStandard Versions table). Standard versions have an orderincrement
requirement of 2500 pieces. Nonstandard versionshave an order increment requirement
of
10,000
pieces.Contact
factory
for
availability
of
http://doc.docsou.com/be5fe575faabfe0f599aa5426.htmlnonstandard versions. Denotes
a lead-free package.
Ordering Information continuedat end of data sheet.
Typical Operating Circuit appears at end of data sheet.Selector Guide appears at end
of data sheet.
________________________________________________________________Maxim Integrated
Products
1
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For pricing, delivery, and ordering information,please contact Maxim Direct at
1-888-629-4642,or visit Maxim’s website at www.maxim-ic.com.
MAX6381–MAX6390
SC70/?DFN, Single/Dual Low-Voltage, Low-Power ?P Reset Circuits
MAX6381–MAX6390
ABSOLUTE MAXIMUM RATINGS
VCC
to
GND..........................................................-0.3V
6.0VRESETOpen-Drain Output....................................-0.3V to
RESET
(push-pull
output)..............-0.3V
to
IN.............................................-0.3V
(VCC
to
6.0VRESET,
0.3V)MR,
(VCC
to
RESET
0.3V)Input
http://doc.docsou.com/be5fe575faabfe0f599aa5426.htmlCurrent
(VCC).............................................................20mAOutput
Current (all pins).....................................................20mA
Continuous Power Dissipation (TA=
3-Pin SC70 (derate 2.9mW/°C above
3.1mW/°C above
70°C)
70°C)..............235mW4-Pin SC70 (derate
70°C)..............245mW6-Pin ?DFN (derate 2.1mW/°C above
70°C)..........167.7mWOperating Temperature Range.........................-40°C
to
125°CStorage
Temperature
Range.............................-65°C
to
150°CLead Temperature (soldering, 10s)................................. 300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent
damage to the device. These are stress ratings only, and functionaloperation of the
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device at these or any other conditions beyond those indicated in the operational
sections of the specifications is not implied. Exposure toabsolute maximum rating
condihttp://doc.docsou.com/be5fe575faabfe0f599aa5426.htmltions
for
extended
periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC= full range, TA= -40°C to
are at TA=
125°C, unless otherwise specified. Typical values
25°C.) (Note 1)
SC70/?DFN, Single/Dual Low-Voltage,
Low-Power ?P Reset Circuits
________________________________________________________________________________
_______3
MAX6381–MAX6390
SC70/?DFN, Single/Dual Low-Voltage, Low-Power ?P Reset CircuitsMAX6381–MAX6390
(TA =
25°C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
(NO LOAD)
POWER-DOWN RESET DELAY
vs. TEMPERATURE
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NORMALIZED RESET TIMEOUT PERIOD
41POWER-DOWN RESET DELAY (?s)
3937353331292725
NORMALIZED POWER-UP RESET TIMEOUT
vs. TEMPERATURE
MAX6381/90 toc03
98SUPPLY CURRENT (?A)
76543210
43
1.081.061http://doc.docsou.com/be5fe575faabfe0f599aa5426.html.041.021.000.980.96
0.94
-40-25-105203550658095110125
TEMPERATURE (°C)
-40-25-10520355065
8095110125
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TEMPERATURE (°C)
-40-25-105203550658095110125
TEMPERATURE (°C)
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE
MAX6381/90 toc04
OUTPUT-VOLTAGE LOWvs. SINK CURRENT
OUTPUT-VOLTAGE HIGHvs. SOURCE CURRENT
1.020NORMALIZED RESET TH
RESHOLD1.0151.0101.0051.0000.9950.9900.985
1.21.00.8
3.02.52.0VOH (V)
1.51.0
VOL (V)
0.6
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0.40.200
3
6ISINK (mA)
9
12
0.500
250
500
750
1000
1250
1500
ISOURCE (?A)
0.990
-40-25-105203550658095110125
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TEMPERATURE (°C)
MAXIMUM TRANSIENT DURATIONvs. RESET COMPARATOR OVERDRIVE
RESET IN TO RESET DELAhttp://doc.docsou.com/be5fe575faabfe0f599aa5426.htmlY
vs. TEMPERATURE
5.35.1RESET IN DELAY (?s)
4.94.74.54.34.13.93.73.5
MAX6381/90 toc08
500
MAXIMUM TRANSIENT DURATION (?s)
450400350300250200150100500
1
10
100
5.5
1000-40-25-105203550658095110125
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TEMPERATURE (°C)
RESET COMPARATOR OVERDRIVE, VTH - VCC (mV)
4_______________________________________________________________________________
_______
SC70/?DFN, Single/Dual Low-Voltage,
Low-Power ?P Reset Circuits
Pin Description
MAX6381–MAX6390
SC70/?DFN, Single/Dual Low-Voltage, Low-Power ?P Reset CircuitsMAX6381–MAX6390
Detailed Description
RESET Output
A ?P reset input starts the ?P in a known state. These?P supervisory circuits assert
reset to prevent codeexecution errors during power-up, power-down, orbrownout
conditions.
Resehttp://doc.docsou.com/be5fe575faabfe0f599aa5426.htmlt asserts when VCCis below
the reset threshold;once VCCexceeds the reset threshold, an internal timerkeeps the
reset output asserted for the reset timeoutperiod. After this interval, reset output
deasserts. Resetoutput is guaranteed to be in the correct logic state forVCC≥1V.
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Manual Reset Input (MAX6384/MAX6385/MAX6386/MAX6390)
Many ?P-based products require manual reset capabil-ity, allowing the operator, a
test technician, or externallogic circuitry to initiate a reset. A logic low on
MRasserts reset. Reset remains asserted while MRis low,and for the reset active
timeout
period
(tRP)
after
MRreturns
high.
This
input
has
an
internal
63k?pullupresistor (1.56k?for MAX6390), so it can be left uncon-nected if it is not
used. MRcan be driven with TTL orCMOS logic levels, or with open-drain/collector
outputs.Connect a normally open momentary switch from MRtoGND to create a
manual-reset
function;
externaldebounce
circuitryhttp://doc.docsou.com/be5fe575faabfe0f599aa5426.html is not required. If
MRis driven fromlong cables or if the device is used in a noisy environ-ment,
connecting a 0.1?F capacitor from MRto GNDprovides 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, resetasserts. 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 RESETIN (shown in Figure 1). Reset asserts when either VCCor 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
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with no signifhttp://doc.docsou.com/be5fe575faabfe0f599aa5426.htmlicant lossin
accuracy.
___________Applications Information
In addition to issuing a reset to the ?P during power-up,power-down, and brownout
conditions,
theMAX6381–MAX6390
are
relatively
immune
to
short
dura-tion
negative-going VCCtransients (glitches).
The Typical Operating Characteristicssection shows theMaximum Transient Durations
vs. Reset ComparatorOverdrive, for which the MAX6381–MAX6390 do notgenerate a reset
pulse. This graph was generated using
Negative-Going VCCTransients
6_______________________________________________________________________________
________
SC70/?DFN, Single/Dual Low-Voltage,
Low-Power ?P Reset Circuits
does not work with the open-drain outputs of theMAX6383/MAX6386/MAX6389/MAX6390. The
resistorvalue used is not critical, but it must be small enoughnot to load the reset
output
when
Vreset
threshold.
For
most
applications,
100kCCis
abovhttp://doc.docsou.com/be5fe575faabfe0f599aa5426.htmle the?is ade-quate.
a negative-going pulse applied to VCC, starting abovethe actual reset threshold and
ending below it by themagnitude indicated (reset comparator overdrive).
Thegraph
indicates the typical maximum pulse width a neg-ative-going VCCtransient may have
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without causing areset pulse to be issued.
As the magnitude of the tran-sient
increases (goes farther below the reset threshold),the maximum allowable pulse width
decreases.
A 0.1?Fcapacitor mounted as close as possible to VCCprovidesadditional
transient immunity.
Ensuring a Valid RESETOutput Down to VCC= 0V
The MAX6381–MAX6390 are guaranteed to operateproperly down to V
valid reset levels down to VCC= 1V. In applications that requireCC= 0V, a pulldown
resistorto active-low outputs (push/pull only, Figure 2) and apullup resistor to
active-high outputs (push/pull only)will ensure that the reset line is valid while
the
reset
out-put
canhttp://doc.docsou.com/be5fe575faabfe0f599aa5426.html
no
longer sink or source current. This scheme
________________________________________________________________________________
_______7
MAX6381–MAX6390
SC70/?DFN, Single/Dual Low-Voltage, Low-Power ?P Reset CircuitsMAX6381–MAX6390
Selector Guide
Note:Insert reset threshold suffix (see Reset Threshold table)after "XR", "XS", or
"LT." Insert reset timeout delay (see ResetTimeout Delay table) after "D" to complete
the part number.Sample stock is generally held on standard versions only (seeStandard
Versions table). Standard versions have an orderincrement requirement of 2500 pieces.
Nonstandard versionshave an order increment requirement of 10,000 pieces.Contact
factory for availability of nonstandard versions.*MAX6390 is available with D4 or
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D7 timing only. Denotes a lead-free package.
8
________________________________________________________________________________
_______://doc.docsou.com/be5fe575faabfe0f599aa5426.htmlpar
SC70/?DFN, Single/Dual Low-Voltage,
Low-Power ?P Reset Circuits
Pin Configurations (continued)
Chip Information
TRANSISTOR COUNT: 647PROCESS: BiCMOS
________________________________________________________________________________
_______9
MAX6381–MAX6390
SC70/?DFN, Single/Dual Low-Voltage, Low-Power ?P Reset CircuitsMAX6381–MAX6390
Package Information
(The package drawing(s) in this data sheet may not reflect the most current
specifications. For the latest package outline information,go to .)
10______________________________________________________________________________
________
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SC70/?DFN, Single/Dual Low-Voltage,
Low-Power ?P Reset Circuits
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current
specifications.
For
the
latest
package
outline
informathttp://doc.docsou.com/be5fe575faabfe0f599aa5426.htmlion,go
to
________________________________________________________________________________
______11
MAX6381–MAX6390
SC70/?DFN, Single/Dual Low-Voltage, Low-Power ?P Reset Circuits90
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current
specifications.
For
the
latest
package
outline
information,go
to
36XAM–1836XAM12________________________________________________________________
______________________
SC70/?DFN, Single/Dual Low-Voltage,
Low-Power ?P Reset Circuits
Package Information (continued)
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(The package drawing(s) in this data sheet may not reflect the most current
specifications. For the latest package outline information,go to Revision History
Pages changed at Rev 4: Title on all pages, 1, 2, 5,
7–13
Maxim cannot assume responsibility for use of any circuitry other than circuitry
http://doc.docsou.com/be5fe575faabfe0f599aa5426.htmlentirely embodied in a Maxim
product. No circuit patent licenses areimplied. Maxim reserves the right to change
the circuitry and specifications without notice at any time.
Maxim
Integrated
Products,
120
San
Gabriel
Drive,
Sunnyvale,
CA
94086
408-737-7600____________________13?2007 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
MAX6381–MAX6390
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