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参数资料
| 型号： | IL3422E |
| 厂商： | NVE Corp/Isolation Products |
| 文件页数： | 17/18页 |
| 文件大小： | 0K |
| 描述： | TXRX ISO BUS 20MBPS RS422 16SOIC |
| 产品培训模块： | IsoLoop® Isolator |
| 产品目录绘图： | IL3122, 3222, 3422 Circuit |
| 特色产品： | Wide-Body SOIC-16 Isolators |
| 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： | RS422 |
| 电源电压： | 3 V ~ 5.5 V，4.5 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 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： | 390-1100-5 |
IL3485/IL3422
8
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
Phone: (952) 829-9217
Fax: (952) 829-9189
www.IsoLoop.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 IL3422 and IL3485 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. IL3422
and IL3485 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 |
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| IL34262 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Power Factor Controllers |
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| IL34262D | 制造商:IKSEMICON 制造商全称:IK Semicon Co., Ltd 功能描述:Power Factor Controllers |
| IL34262N | 制造商:IKSEMICON 制造商全称:IK Semicon Co., Ltd 功能描述:Power Factor Controllers |
| IL3480 | 制造商:IKSEMICON 制造商全称:IK Semicon Co., Ltd 功能描述:100mA, Quasi Low-Dropout Voltage Regulator |
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