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v
右
e?
f
osc
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pwm
偏差
por
por
过滤器
PWD
承运人 检测
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v
右
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f
输入
+
过滤器
数据 mux
交流电 检测
3-州
输出 缓冲区
入点
出点
隔离 护栏
直流 频道
交流电 频道
功能
图表
iso721,iso721m
SLLS629A–JANUARY2006–REVISEDJANUARY2006
3.3-v/5-vhigh-speeddigitalisolators
•
掉落-inreplacementformostoptoand
MagneticIsolators
•
4000-v
(峰值)
隔离
–ul1577,iec60747-5-2(vde0884,rev.2)
–iec61010-1andcsaapproved
•
IndustrialFieldbus
–50kv/µstransientimmunitytypical
–Modbus
•
SignalingRate0Mbpsto150Mbps
–Profibus
–low-propagationdelay
–DeviceNet™DataBuses
–lowpulse-widthdistortion
–smartdistributedsystems(sds™)
•
高-electromagneticimmunity
•
ComputerPeripheralInterface
•
低-inputcurrentrequirement
•
ServoControlInterface
•
DataAcquisition
•
FailsafeOutput
TheISO721andISO721Mdigitalisolatorshavealogicinputandoutputbufferseparatedbyasiliconoxide
(sio
2
)insulationbarrier.thisbarrierprovidesgalvanicisolationofupto4000v.usedinconjunctionwith
isolatedpowersupplies,thesedevicespreventnoisecurrentsonadatabusorothercircuitsfromenteringthe
localground,andinterferingwithordamagingsensitivecircuitry.
abinaryinputsignalisconditioned,translatedtoabalancedsignal,thendifferentiatedbythecapacitiveisolation
护栏.acrosstheisolationbarrier,adifferentialcomparatorreceivesthelogictransitioninformation,thensetsor
resetsaflip-flopandtheoutputcircuitaccordingly.aperiodicupdatepulseissentacrossthebarriertoensure
theproperdcleveloftheoutput.ifthisdc-refreshpulseisnotreceivedformorethan4µs,theinputisassumed
tobeunpoweredornotfunctional,andthefailsafecircuitdrivestheoutputtoalogichighstate.
pleasebeawarethatanimportantnoticeconcerningavailability,标准保修,anduseincriticalapplicationsoftexas
instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
sdsisatrademarkofhoneywell.
devicenetisatrademarkofopendevicenetvendorsassociation,公司
productiondatainformationiscurrentasofpublicationdate.
copyright©2006,texasinstrumentsincorporated
ProductsconformtospecificationsperthetermsoftheTexas
instrumentsstandardwarranty.productionprocessingdoesnot
必要包括测试所有参数.
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