Datasheet

Date: 02/24/05 SP3222E, SP3232E True +3.0 to +5.0V RS-232 Transceivers © Copyright 2005 Sipex Corporation
14
Figure 19. ESD Test Waveform for IEC1000-4-2
30A
I ➙
0A
15A
t=30ns
t ➙
t=0ns
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
S
value and lower R
S
value in 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.
Device Pin Human Body IEC1000-4-2
Tested Model Air Discharge Direct Contact Level
Driver Outputs ±15kV ±15kV ±8kV 4
Receiver Inputs ±15kV ±15kV ±8kV 4
Table 3. Transceiver ESD Tolerance Levels