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SP3220EUEY-L-TR Datasheet(PDF) 15 Page - Exar Corporation

Part No. SP3220EUEY-L-TR
Description  3.0V to 5.5V RS-232 Driver/Receiver Pair
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Maker  EXAR [Exar Corporation]
Homepage  http://www.exar.com
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SP3220EUEY-L-TR Datasheet(HTML) 15 Page - Exar Corporation

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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3220E_EB_EU_102_102016
15
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
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 20 and 21 rep-
resentthetypicalESDtestingcircuitusedfor
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
limitingresistor(R
S) and the source capacitor
(C
S) are 1.5kΩ an 100pF, respectively. For
IEC-61000-4-2, the current limiting resistor
(R
S) and the source capacitor (CS) are 330Ω
an 150pF, respectively.
Figure 22. ESD Test Waveform for IEC61000-4-2
Figure 21. ESD Test Circuit for IEC61000-4-2
Table 3. 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 →
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 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.
DESCRIPTION


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