SP202E_04 Datasheet, PDF (9/15 Pages) Sipex Corporation – High-Performance RS-232 Line Drivers/Receivers

RR_CC
DC Power
Source
SSWW11
RR_SS
CC_SS
SSWW22
Device
Under
Test
Figure 9. ESD Test Circuit for Human Body Model
with IEC1000-4-2 is that the system is required
to withstand an amount of static electricity when
ESD is applied to points and surfaces of the
equipment that are accessible to personnel during
normal usage. The transceiver IC receives most
of the ESD current when the ESD source is
applied to the connector pins. The test circuit for
IEC1000-4-2 is shown on Figure 10. There are
two methods within IEC1000-4-2, the Air
Discharge method and the Contact Discharge
method.
With the Air Discharge Method, an ESD voltage
is applied to the equipment under test (EUT)
through air. This simulates an electrically charged
person ready to connect a cable onto the rear of
the system only to find an unpleasant zap just
before the person touches the back panel. The
high energy potential on the person discharges
through an arcing path to the rear panel of the
system before he or she even touches the system.
This energy, whether discharged directly or
through air, is predominantly a function of the
RR_CC
DC Power
Source
SSWW11
Contact-Discharge Module
RR_SS
R_V
SSWW22
CC_SS
Device
Under
Test
Figure 10. ESD Test Circuit for IEC1000-4-2
RS and RV add up to 330Ω for IEC1000-4-2.
Date: 7/19/04
SP202E Series High Performance RS232 Transceivers
9
© Copyright 2004 Sipex Corporation