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| 型號(hào)： | NM485DC |
| 廠商： | Murata Power Solutions Inc |
| 文件頁(yè)數(shù)： | 5/6頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | ISOLATED INTERFACE EIA-485 DL |
| 標(biāo)準(zhǔn)包裝： | 15 |
| 系列： | IsoLoop® |
| 類型： | 收發(fā)器，隔離式 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 1/1 |
| 規(guī)程： | RS485 |
| 電源電壓： | 4.75 V ~ 5.25 V |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 24-DIP（0.667"，16.95mm） |
| 供應(yīng)商設(shè)備封裝： | 24-DIL |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁(yè)面： | 2721 (CN2011-ZH PDF) |
| 其它名稱： | 811-1445-5 |
NM485DC Series
Isolated Dual EIA-485 Driver and Receiver
KII_NM485DC.A05 Page 5 of 6
www.murata-ps.com/support
APPLICATION NOTES (continued)
NM485D receiver output status
The receiver output will be high (>2.7V) when the differential input lines are left open (open circuit). However, when a line termination resistor is attached, the inputs are
effectively shorted together, not left oating. Since the receiver has typically 70mV of hysteresis, the output will remain in its last active state, high or low.
To force the receiver output to a known state, the conguration shown in gure 7 should be used. It should be noted that this arrangement will use typically 100mW of
power, for each receiver connected in this manner.
The termination resistors are used to generate a DC bias, which forces the receiver into a high state, when no signal is applied. This arrangement will still allow the output
to switch due to a change at the input, whilst maintaining line termination characteristics.
TECHNICAL NOTES
ISOLATION VOLTAGE
‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Voltage’, ‘Proof Voltage’, ‘Dielectric Withstand Voltage’ & ‘Isolation Test Voltage’ are all terms that relate to the same thing, a test voltage,
applied for a specied time, across a component designed to provide electrical isolation, to verify the integrity of that isolation.
Murata Power Solutions NM485DC series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 1000Vrms for 1 second.
A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”
For a part holding no specic agency approvals, such as the NM485DC series, both input and output should normally be maintained within SELV limits i.e. less than 42.4V peak, or
60VDC. The isolation test voltage represents a measure of immunity to transient voltages and the part should never be used as an element of a safety isolation system. The part
could be expected to function correctly with several hundred volts offset applied continuously across the isolation barrier; but then the circuitry on both sides of the barrier must
be regarded as operating at an unsafe voltage and further isolation/insulation systems must form a barrier between these circuits and any user-accessible circuitry according to
safety standard requirements.
REPEATED HIGH-VOLTAGE ISOLATION TESTING
It is well known that repeated high-voltage isolation testing of a barrier component can actually degrade isolation capability, to a lesser or greater degree depending on materials,
construction and environment. The NM485DC series has toroidal isolation transformers, with no additional insulation between primary and secondary windings of enameled wire.
While parts can be expected to withstand several times the stated test voltage, the isolation capability does depend on the wire insulation. Any material, including this enamel
(typically polyurethane) is susceptible to eventual chemical degradation when subject to very high applied voltages thus implying that the number of tests should be strictly limited.
We therefore strongly advise against repeated high voltage isolation testing, but if it is absolutely required, that the voltage be reduced by 20% from specied test voltage.
This consideration equally applies to agency recognized parts rated for better than functional isolation where the wire enamel insulation is always supplemented by a further
insulation system of physical spacing or barriers.
RoHS COMPLIANCE INFORMATION
This series is compatible with RoHS soldering systems with a peak wave solder temperature of 300C for 10 seconds. The pin termination
nish on this product series is Matte Tin over Nickel Preplate. The series is backward compatible with Sn/Pb soldering systems.
For further information, please visit www.murata-ps.com/rohs
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NM485SLC | 功能描述:RS-485接口IC Iso Dual EIA-485 Driver and Receiver RoHS:否 制造商:Texas Instruments 數(shù)據(jù)速率:250 Kbps 工作電源電壓:3.3 V 電源電流:750 uA 工作溫度范圍:- 40 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| NM4B | 制造商:Panduit Corp 功能描述:Cable Accessories 制造商:Panduit Corp 功能描述:NM4 AND NMF4 BLANKING KIT - Bulk |
| NM-4-F4 | 制造商:ESSENTRA COMPONENTS 功能描述:LOOP CLAMP W/EYELET NAT 1/4" 制造商:Richco 功能描述:LOOP CLAMP W/EYELET NAT 1/4" |
| NM4-KIT | 制造商:Panduit Corp 功能描述:KIT FOR NM4 制造商:Panduit Corp 功能描述:KIT FOR NM4 - Bulk |
| NM-4-R4 | 功能描述:LOOP CLAMP W/ EYELET GRN 1/4" RoHS:是 類別:線纜，導(dǎo)線 - 管理 >> 線夾和夾具 系列:NM-R 標(biāo)準(zhǔn)包裝:100 系列:TC 類型:C-夾 開(kāi)口尺寸:0.79" L x 0.54" W x 0.67" H（20.1mm x 13.7mm x 17.0mm） 安裝類型:釘子 材質(zhì):聚丙烯 顏色:黑 |
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