SP3220EBCY-L Datasheet, PDF (15/19 Pages) Sipex Corporation – High Speed +3.0V to +5.5V RS-232 Driver/Receiver Pair

For the Human Body Model, the current
limiting resistor (R_S) and the source capacitor
(C_S) are 1.5k and 100pF, respectively. For
IEC-1000-4-2, the current limiting resistor (RS)
and the source capacitor (CS) are 330 and
150pF, respectively.
The higher CS value and lower RS value in the
IEC1000-4-2 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.
30A
15A
0A
t=0nS
t
t=30nS
Figure 22. ESD Test Waveform for IEC1000-4-2
Device Pin
Tested
Driver Ouputs
Receiver Inputs
Human Body
Model
±15kV
±15kV
IEC1000-4-2
Air Discharge Direct Contact
±15kV
±8kV
±15kV
±8kV
Level
4
4
Rev: A Date:12/11/03
SP3220EB/EU +3.0 to +5.0V RS-232 Transceivers
15
© Copyright 2002 Sipex Corporation