SP1481E Datasheet, PDF (7/10 Pages) Sipex Corporation – ±15kV Enhanced Low Power Half-Duplex RS-485 Transceivers

The IEC-1000-4-2, formerly IEC801-2, is
generally used for testing ESD on equipment
and systems. For system manufacturers,
they must guarantee a certain amount of ESD
protection since the system itself is exposed
to the outside environment and human pres-
ence.The premise 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 8.
There are two methods within IEC1000-4-2,
the Air Discharge method and the Contact
Discharge method.
RR_CC
DC Power
Source
SSWW11
RR_SS
CC_SS
SSWW22
Device
Under
Test
Figure 7. ESD Test Circuit for Human Body Model
RR_CC
DC Power
Source
SSWW11
Contact-Discharge Module
RR_SS
R_V
SSWW22
CC_SS
Device
Under
Test
RS and RV add up to 330Ω ffor IEC1000-4-2.
Figure 8. ESD Test Circuit for IEC1000-4-2
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

SP1481E-1485E_100_061609