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| 型號： | SP490EEN |
| 英文描述： | Enhanced Full Duplex RS-485 Transceivers |
| 中文描述： | 增強(qiáng)型全雙工RS - 485接口收發(fā)器 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 109K |
| 代理商： | SP490EEN |
9
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
Copyright 2000 Sipex Corporation
person ready to connect a cable onto the rear of
the system only to find an unpleasant zap just
before the person touches the back panel. The
high energy potential on the person discharges
through an arcing path to the rear panel of the
system before he or she even touches the system.
This energy, whether discharged directly or
through air, is predominantly a function of the
discharge current rather than the discharge
voltage. Variables with an air discharge such as
approach speed of the object carrying the ESD
potential to the system and humidity will tend to
change the discharge current. For example, the
rise time of the discharge current varies with the
approach speed.
The Contact Discharge Method applies the ESD
current directly to the EUT. This method was
devised to reduce the unpredictability of the
ESD arc. The discharge current rise time is
constant since the energy is directly transferred
without the air-gap arc. In situations such as
hand held systems, the ESD charge can be directly
discharged to the equipment from a person already
holding the equipment. The current is transferred
on to the keypad or the serial port of the equipment
directly and then travels through the PCB and
finally to the IC.
The circuit models in
Figures 9
and
10
represent
the typical ESD testing circuits used for all three
methods. The C
S
is initially charged with the DC
power supply when the first switch (SW1) is on.
Now that the capacitor is charged, the second
switch (SW2) is on while SW1 switches off. The
voltage stored in the capacitor is then applied
through R
S
, the current limiting resistor, onto the
device under test (DUT). In ESD tests, the SW2
switch is pulsed so that the device under test
receives a duration of voltage.
For the Human Body Model, the current limiting
resistor (R
) and the source capacitor (C
) are
1.5k
an 100pF, respectively. For IEC-1000-4-
2, the current limiting resistor (R
) and the source
capacitor (C
S
) are 330
an 150pF, respectively.
The higher C
value and lower R
value in the
IEC1000-4-2 model are more stringent than the
Human Body Model. The larger storage capacitor
injects a higher voltage to the test point when
SW2 is switched on. The lower current limiting
resistor increases the current charge onto the test
point.
SP490E/SP491E HUMAN BODY
Family
MODEL Air Discharge Direct Contact Level
IEC1000-4-2
Driver Outputs
Receiver Inputs
±
15kV
±
15kV
±
15kV
±
15kV
±
8kV
±
8kV
4
4
Table 1. Transceiver ESD Tolerance Levels
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP490EEP | Enhanced Full Duplex RS-485 Transceivers |
| SP491E | Enhanced Full Duplex RS-485 Transceivers |
| SP491ECN | Enhanced Full Duplex RS-485 Transceivers |
| SP491ECP | Enhanced Full Duplex RS-485 Transceivers |
| SP491EEN | Enhanced Full Duplex RS-485 Transceivers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP490EEN-L | 功能描述:RS-422/RS-485 接口 IC RS485 10000 kbps 5V temp -40C to 85C RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| SP490EEN-L/TR | 功能描述:RS-485接口IC Full Duplex RS-485 s 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 |
| SP490EEP | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Enhanced Full Duplex RS-485 Transceivers |
| SP490EEP-L | 功能描述:RS-485接口IC Full Duplex RS-485 s 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 |
| SP490EEP-L | 制造商:Exar Corporation 功能描述:TRANSCEIVER, RS485, 10MBPS, 5V, DIP-8; Device Type:RS485 Transceiver; IC Interface Type:RS485; No. of Drivers:1; Supply Voltage Min:4.75V; Supply Voltage Max:5.25V; Driver Case Style:DIP; No. of Pins:8; Operating Temperature Max:85C;RoHS Compliant: No |
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