SP3222EU_06 Datasheet, PDF (14/20 Pages) Sipex Corporation – 3.3V, 1000 Kbps RS-232 Transceivers

For the Human Body Model, the current
limiting resistor (R_S) and the source capacitor
(C )
S
are
1.5kΩ
an
100pF,
respectively.
For
IEC-1000-4-2, the current limiting resistor
(R )
S
and
the
source
capacitor
(C )
S
are
330Ω
an 150pF, respectively.
The higher C value and lower R value in
S
S
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.
30A
15A
0A
t=0ns
t➙
t=30ns
Figure 22. ESD Test Waveform for IEC1000-4-2
Device Pin
Tested
Driver Outputs
Receiver Inputs
Human Body
Model
±15kV
±15kV
Table 3. Transceiver ESD Tolerance Levels
IEC1000-4-2
Air Discharge Direct Contact
±15kV
±15kV
±8kV
±8kV
Level
4
4
Date: 02/31/06
SP3222EU, SP3232EU 3.3V, 1000Kbps RS-232 Transceivers
14
© Copyright 2006 Sipex Corporation