參數(shù)資料
型號： 6N137
元件分類： 光電耦合器
英文描述： 1 CHANNEL LOGIC OUTPUT OPTOCOUPLER, 10 Mbps
封裝： 0.300 INCH, DIP-8
文件頁數(shù)： 14/22頁
文件大小： 384K
代理商： 6N137
21
Propagation Delay, Pulse-Width Distortion and Propagation
Delay Skew
Propagation delay is a figure of merit which describes
how quickly a logic signal propagates through a sys-
tem.Thepropagationdelayfromlowtohigh(t
PLH)isthe
amountoftimerequiredforaninputsignaltopropagate
totheoutput,causingtheoutputtochangefromlowto
high.Similarly,thepropagationdelayfromhightolow
(t
PHL)istheamountoftimerequiredfortheinputsignal
topropagatetotheoutputcausingtheoutputtochange
fromhightolow(seeFigure8).
Pulse-width distortion (PWD) results when t
PLH and tPHL
differ in value. PWD is defined as the difference be-
tweent
PLHand tPHL and often determines the maximum
dataratecapabilityofatransmissionsystem.PWDcan
beexpressedinpercentbydividingthePWD(inns)by
theminimumpulsewidth(inns)beingtransmitted.Typi-
cally,PWDontheorderof20-30%oftheminimumpulse
widthistolerable;theexactfiguredependsonthepar-
ticularapplication(RS232,RS422,T-l,etc.).
Propagationdelayskew,t
PSK,isanimportantparameterto
considerinparalleldataapplicationswheresynchroniza-
tionofsignalsonparalleldatalinesisaconcern.Ifthe
paralleldataisbeingsentthroughagroupofoptocou-
plers, differences in propagation delays will cause the
datatoarriveattheoutputsoftheoptocouplersatdiffer-
enttimes.Ifthisdifferenceinpropagationdelaysislarge
enough, it will determine the maximum rate at which
paralleldatacanbesentthroughtheoptocouplers.
Propagationdelayskewisdefinedasthedifferencebe-
tweentheminimumandmaximumpropagationdelays,
either t
PLH or tPHL, for any given group of optocouplers
whichareoperatingunderthesameconditions(i.e.,the
samedrivecurrent,supplyvoltage,outputload,andop-
eratingtemperature).AsillustratedinFigure19,ifthein-
putsofagroupofoptocouplersareswitchedeitherON
orOFFatthesametime,t
PSK is the difference between
theshortestpropagationdelay,eithert
PLHortPHL,andthe
longestpropagationdelay,eithert
PLHortPHL.
Asmentionedearlier,t
PSK can determine the maximum
parallel data transmission rate. Figure 20 is the timing
diagramofatypicalparalleldataapplicationwithboth
the clock and the data lines being sent through opto-
couplers.Thefigureshowsdataandclocksignalsatthe
inputs and outputs of the optocouplers.To obtain the
maximum data transmission rate, both edges of the
clocksignalarebeingusedtoclockthedata;ifonlyone
edgewereused,theclocksignalwouldneedtobetwice
asfast.
Propagation delay skew represents the uncertainty of
where an edge might be after being sent through an
optocoupler. Figure 20 shows that there will be uncer-
taintyinboththedataandtheclocklines.Itisimportant
thatthesetwoareasofuncertaintynotoverlap,other-
wisetheclocksignalmightarrivebeforeallofthedata
outputshavesettled,orsomeofthedataoutputsmay
starttochangebeforetheclocksignalhasarrived.From
theseconsiderations,theabsoluteminimumpulsewidth
thatcanbesentthroughoptocouplersinaparallelappli-
cationistwicet
PSK.Acautiousdesignshoulduseaslightly
longerpulsewidthtoensurethatanyadditionaluncer-
taintyintherestofthecircuitdoesnotcauseaproblem.
Thet
PSK specified optocouplers offer the advantages of
guaranteedspecificationsforpropagationdelays,pulse-
width distortion and propagation delay skew over the
recommended temperature, input current, and power
supplyranges.
Figure 19. Illustration of propagation delay skew - t
PSK.
Figure 20. Parallel data transmission example.
50%
1.5 V
I F
VO
50%
I F
VO
tPSK
1.5 V
6N137 fig 19
6N137 fig 20
DATA
t PSK
INPUTS
CLOCK
DATA
OUTPUTS
CLOCK
t PSK
相關PDF資料
PDF描述
HCPL-2611-320 1 CHANNEL LOGIC OUTPUT OPTOCOUPLER, 10 Mbps
6N137 High CMR, Very High Speed Optically Coupled Isolator Logic Gate Output(高CMR，超高速邏輯門輸出的光隔離器)
6N137 HIGH SPEED COUPLER
6N138#300 1 CHANNEL LOGIC OUTPUT OPTOCOUPLER, 0.1 Mbps
6N138#500 1 CHANNEL LOGIC OUTPUT OPTOCOUPLER, 0.1 Mbps
相關代理商/技術參數(shù)
參數(shù)描述
6N137#020 功能描述:高速光耦合器 10 Mb/s 5000Vrms RoHS:否 制造商:Avago Technologies 電流傳遞比: 最大波特率: 最大正向二極管電壓:1.75 V 最大反向二極管電壓:5 V 最大功率耗散:40 mW 最大工作溫度:+125 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-5 封裝:Tube
6N137#060 功能描述:高速光耦合器 10 Mb/s 3750Vrms RoHS:否 制造商:Avago Technologies 電流傳遞比: 最大波特率: 最大正向二極管電壓:1.75 V 最大反向二極管電壓:5 V 最大功率耗散:40 mW 最大工作溫度:+125 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-5 封裝:Tube
6N137#300 功能描述:高速光耦合器 10 Mb/s 3750Vrms RoHS:否 制造商:Avago Technologies 電流傳遞比: 最大波特率: 最大正向二極管電壓:1.75 V 最大反向二極管電壓:5 V 最大功率耗散:40 mW 最大工作溫度:+125 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-5 封裝:Tube
6N137#320 功能描述:高速光耦合器 10 Mb/s 5000Vrms RoHS:否 制造商:Avago Technologies 電流傳遞比: 最大波特率: 最大正向二極管電壓:1.75 V 最大反向二極管電壓:5 V 最大功率耗散:40 mW 最大工作溫度:+125 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-5 封裝:Tube
6N137#500 功能描述:高速光耦合器 10 Mb/s 3750Vrms RoHS:否 制造商:Avago Technologies 電流傳遞比: 最大波特率: 最大正向二極管電壓:1.75 V 最大反向二極管電壓:5 V 最大功率耗散:40 mW 最大工作溫度:+125 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-5 封裝:Tube
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