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tps3306-15
tps3306-18,tps3306-20
tps3306-25,tps3306-33
SLVS290A–APRIL2000–REVISEDMAY2004
thevarioussupervisorycircuitsaredesignedtomonitorthenominalsupplyvoltage,asshowninthefollowing
supplyvoltagemonitoringtable.
SUPPLYVOLTAGEMONITORING
nominalsupervisedvoltagethresholdvoltage(典型值)
设备
SENSE1SENSE2SENSE1SENSE2
tps3306-153.3v1.5v2.93v1.4v
tps3306-183.3v1.8v2.93v1.68v
tps3306-203.3v2v2.93v1.85v
tps3306-253.3v2.5v2.93v2.25v
tps3306-335v3.3v4.55v2.93v
duringpower-在,resetisassertedwhenthesupplyvoltagev
DD
becomeshigherthan1.1v.thereafter,这
supervisorycircuitsmonitortheSENSEninputsandkeepRESETactiveaslongasSENSEnremainsbelowthe
thresholdvoltageV
它
.
aninternaltimerdelaysthereturnoftheresetoutputtotheinactivestate(高)toensurepropersystem
重置.thedelaytime,t
d(典型值)
=100ms,startsaftersense1andsense2inputshaverisenabovethethreshold
voltageV
它
.whenthevoltageatsense1orsense2inputdropsbelowthethresholdvoltagev
它
,theoutput
becomesactive(低)又一次.
theintegratedpower-失败(pfi)comparatorwithseparateopen-流(pfo)outputcanbeusedforlow-电池
发现,电源-failwarning,orformonitoringapowersupplyotherthanthemainsupply.
thetps3306-xxdevicesintegrateawatchdogtimerthatisperiodicallytriggeredbyapositiveornegative
transitionofwdi.whenthesupervisingsystemfailstoretriggerthewatchdogcircuitwithinthetime-outinterval,
t
t(输出)
=0.50s,resetbecomesactiveforthetimeperiodt
d
.thiseventalsoreinitializesthewatchdogtimer.
leavingwdiunconnecteddisablesthewatchdog.
thetps3306-xxdevicesareavailableineither8-pinmsoporstandard8-pinsopackages,andare
characterizedforoperationoveratemperaturerangeof-40
°
Cto85
°
c.
AVAILABLEOPTIONS
PACKAGEDDEVICES
标记
T
一个
DGKPACKAGE
smalloutline(d)µ-smalloutline(dgk)
tps3306-15dtps3306-15dgktiaic
tps3306-18dtps3306-18dgktiaid
-40
°
Cto85
°
ctps3306-20dtps3306-20dgktiaie
tps3306-25dtps3306-25dgktiaif
tps3306-33dtps3306-33dgktiaig
2
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