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SP385E Datasheet(PDF) 11 Page - Exar Corporation

Part # SP385E
Description  Enhanced 3V or 5V RS-232 Line Driver/Receiver
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

SP385E Datasheet(HTML) 11 Page - Exar Corporation

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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP385E_100_030811
11
DEVICE PIN
HUMAN BODy
IEC61000-4-2
TESTED
MODEL
Air Discharge
Direct Contact
Level
Driver Outputs
+15kV
+15kV
+8kV
4
Receiver Inputs
+15kV
+15kV
+8kV
4
The circuit models in Figures 6 and 7 represent
the typical ESD testing circuit 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
S) and the source capacitor (CS) are
1.5kΩan100pF,respectively. ForIEC-61000-4-2,
thecurrentlimitingresistor(R
S) and the source ca-
pacitor (C
S) are 330Ω an 150pF, respectively.
The higher C
S value and lower RS value in the
IEC61000-4-2 model are more stringent than the
Human Body Model. The larger storage capaci-
tor 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.
Figure 8. ESD Test Waveform for IEC61000-4-2
Figure 7. ESD Test Circuit for IEC61000-4-2
Table 1. Transceiver ESD Tolerance Levels
RS and RV add up to 330Ω for IEC61000-4-2.
RC
Device
Under
Test
DC Power
Source
CS
RS
SW1
SW2
RV
Contact-Discharge Model
t = 0ns
t = 30ns
0A
15A
30A
t →


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