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| 型号： | IL3285-3E |
| 厂商： | NVE Corp/Isolation Products |
| 文件页数： | 17/18页 |
| 文件大小： | 0K |
| 描述： | TXRX ISO BUS 5MBPS RS485 16SOIC |
| 产品培训模块： | IsoLoop® Isolator |
| 产品目录绘图： | IL3(1,2,4)85 Circuit |
| 标准包装： | 50 |
| 系列： | IsoLoop® |
| 类型： | 收发器，隔离式 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS485 |
| 电源电压： | 3.3V，5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 管件 |
| 产品目录页面： | 2771 (CN2011-ZH PDF) |
| 其它名称： | 390-1126-5 |
IL3285/IL3222
8
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
Phone: (952) 829-9217
www.isoloop.com
iso-info@nve.com
NVE Corporation
2500
16
5000
3
500
1000
Signal
Rise/Fall Time (ns)
C
Boost (pF)
16
5000
3
1000
Signal
Rise/Fall Time (ns)
C
Boost (pF)
20
50
100
210
Applications Information
Input Resistor Values
The IL3222 and IL3285 are current-mode devices. Changes in input coil current switch internal spintronic GMR sensors. Inputs
are logically high when the coil voltage is high, that is when there is no coil current.
A single resistor is required to limit the input coil current to the 5 mA threshold current. The absolute maximum current through
any coil is 25 mA.
Typical Input Resistor Values
The table shows typical values for the external resistor in 5 V and 3 V logic systems.
As always, these values as approximate and should be adjusted for temperature or
other application specifics. If the expected temperature range is large, 1% tolerance
resistors may provide additional design margin.
Boost Capacitor
The boost capacitor in parallel with the current-limiting resistor boosts
the instantaneous coil current at the signal transition. This ensures
switching and reduces propagation delay and reduces pulse-width
distortion.
Select the value of the boost capacitor based on the rise and fall times
of the signal driving the inputs. The instantaneous boost capacitor
current is proportional to input edge speeds (
). Select a capacitor
value based on the rise and fall times of the input signal to be isolated
that provides approximately 20 mA of additional “boost” current.
Figure 2 is a guide to boost capacitor selection. For high-speed logic
signals (tr,tf < 10 ns), a 16 pF capacitor is recommended. The capacitor
value is generally not critical; if in doubt, choose a higher value up to a
maximum of 470 pF.
RS-485 and RS-422 Busses
RS-485 and RS-422 are differential (balanced) data transmission standards for use over long distances or in noisy environments.
RS-422 is an RS-485 subset, so RS-485 transceivers are also RS-422-compliant. RS-422 is a multi-drop standard allowing only
one driver and up to 10 receivers on each bus (assuming unit load receivers). RS-485 is a true multipoint standard which allows up
to 32 unit load devices (any combination of drivers and receivers) on each bus. To allow for multipoint operation, RS-485 requires
drivers to handle bus contention without damage. Another important advantage of RS-485 is the extended common-mode range
(CMR), which requires driver outputs and receiver inputs withstand +12 V to 7 V. RS-422 and RS-485 are intended for runs as
long as 4,000 feet (1,200 m), so the wide CMR is necessary for ground potential differences, as well as voltages induced in the
cable by external fields.
Receiver Features
IL3000 transceivers have differential input receivers for maximum noise immunity and common-mode rejection. Input sensitivity
is ±200 mV as required by the RS-422 and RS-485 specifications. The receivers include a “fail-safe if open” function that
guarantees a high level receiver output if the receiver inputs are unconnected (floating). Receivers easily meet the data rates
supported by the corresponding driver. IL3000-Series receiver outputs have tri-state capabilities with active low RE inputs.
Driver Features
The RS485/422 driver is a differential output device that delivers at least 1.5 V across a 54 load (RS-485), and at least 2 V
across a 100
Ω load (RS-422). The driver features low propagation delay skew to maximize bit width and minimize EMI. IL3222
and IL3285 drivers have tri-state capability with an active high DE input.
VCOIL
0.125W, 5% Resistor
3.3 V
510
Ω
5 V
820
Ω
Figure 2. Cboost Selector
dV
dt
C
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IL3285E | 功能描述:TXRX ISO BUS 1MBS RS485 16SOIC RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:IsoLoop® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS422，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 产品目录页面:1402 (CN2011-ZH PDF) |
| IL3285ETR13 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Fractional Load RS485 and RS422 Transceivers |
| IL3285TR13 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Fractional Load RS485 and RS422 Transceivers |
| IL329 | 制造商:INFINEON 制造商全称:Infineon Technologies AG 功能描述:OPTICALLY COUPLED TELECOM SWITCH |
| IL33035 | 制造商:INTEGRAL 制造商全称:INTEGRAL 功能描述:BRUSHLESS DC MOTOR CONTROLLER |
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