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參數(shù)資料
| 型號(hào)： | 6N137-520 |
| 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, SURFACE MOUNT, DIP-8 |
| 文件頁數(shù)： | 14/22頁 |
| 文件大?。?/td> | 384K |
| 代理商： | 6N137-520 |
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(guān)PDF資料 |
PDF描述 |
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| 6N137 | 1 CHANNEL LOGIC OUTPUT OPTOCOUPLER, 10 Mbps |
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| 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) |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 6N137-520E | 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 |
| 6N137-560 | 功能描述:OPTOCOUPLER(10MBD) T/R+VDE 制造商:broadcom limited 系列:- 零件狀態(tài):在售 通道數(shù):1 輸入 - 輸入側(cè) 1/輸入側(cè) 2:1/0 電壓 - 隔離:3750Vrms 共模瞬態(tài)抗擾度（最小值）:1kV/μs 輸入類型:DC 輸出類型:開集，肖特基箝位 電流 - 輸出/通道:50mA 數(shù)據(jù)速率:10MBd 傳播延遲 tpLH / tpHL（最大值）:75ns，75ns 上升/下降時(shí)間（典型值）:24ns，10ns 電壓 - 正向（Vf）（典型值）:1.8V（最大） 電流 - DC 正向（If）:20mA 電壓 - 電源:4.5 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 標(biāo)準(zhǔn)包裝:1,000 |
| 6N137-560E | 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 |
| 6N137A | 制造商:Vishay Angstrohm 功能描述:DIP-8 CPLR SNGL 10MBD 1KV/US - 制造商:Vishay Semiconductors 功能描述:DIP-8 CPLR SNGL 10MBD 1KV/US -E3 - Tape and Reel 制造商:Vishay Semiconductors 功能描述:OPTOCOUPLER 1CH 10MBD 8DIP 制造商:Vishay Semiconductors 功能描述:OPTOCOUPLER, LOGIC GATE O/P, 5KV, DIP-8; No. of Channels:1; Isolation Voltage:5kV; Optocoupler Output Type:Logic Gate; Input Current:20mA; Output Voltage:7V; Opto Case Style:DIP; No. of Pins:8 ;RoHS Compliant: Yes |
| 6N137A-X001 | 制造商:Vishay Angstrohm 功能描述:DIP-8 CPLR SNGL 10MBD 1KV/US V 制造商:Vishay Semiconductors 功能描述:DIP-8 CPLR SNGL 10MBD 1KV/US VDE-E3 - Tape and Reel 制造商:Vishay Semiconductors 功能描述:OPTOCOUPLER 1CH 10MBD 8DIP 制造商:Vishay Semiconductors 功能描述:OPTOCOUPLER, LOGIC GATE O/P, 5KV, DIP-8; No. of Channels:1; Isolation Voltage:5kV; Optocoupler Output Type:Logic Gate; Input Current:20mA; Output Voltage:7V; Opto Case Style:DIP; No. of Pins:8 ;RoHS Compliant: Yes |
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