For the Human Body Model, the current
limiting resistor (RS) and the source capacitor
(CS) are 1.5kΩ an 100pF, respectively. For
IEC-1000-4-2, the current limiting resistor (RS)
and the source capacitor (CS) are 330Ω an
150pF, respectively.
30A
15A
0A
The higher CS value and lower RS value in the
IEC1000-4-2 model are more stringent than the
HumanBodyModel. Thelargerstoragecapacitor
injectsahighervoltagetothetestpointwhenSW2
isswitchedon. Thelowercurrentlimitingresistor
increases the current charge onto the test point.
t=0ns
t=30ns
t ■
Figure 20. ESD Test Waveform for IEC1000-4-2
Device Pin
Tested
Human Body
Model
IEC1000-4-2
Air Discharge Direct Contact
Level
Driver Outputs
Receiver Inputs
±15kV
±15kV
±15kV
±15kV
±8kV
±8kV
4
4
Table 3. Transceiver ESD Tolerance Levels
Rev. A Date:12/11/03
SP3222EB/3232EB True +3.0 to +5.5V RS-232 Transceivers
© Copyright 2003 Sipex Corporation
14
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