SP3222EH_06 Datasheet, PDF (14/19 Pages) Sipex Corporation – 3.3V, 460 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_Svalue and lower R _Svalue 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.
30A
15A
0A
t=0ns
t➙
t=30ns
Figure 19. ESD Test Waveform for IEC1000-4-2
Device Pin
Tested
Human Body
Model
Driver Outputs
Receiver Inputs
±15kV
±15kV
Table 3. Transceiver ESD Tolerance Levels
IEC1000-4-2
Air Discharge Direct Contact
±15kV
±15kV
±8kV
±8kV
Level
4
4
Date: 1/18/06
SP3222EH/3232EH 3.3V, 460 Kbps RS-232 Transceivers
14
© Copyright 2006 Sipex Corporation