QSG
‐
8475,
Rev.
New
HOLT
INTEGRATED
CIRCUITS
11/7/13
9
Appendix
1
Lightning
Protection
The
ARINC
429
inputs
(RXA
‐
R
and
RXB
‐
R)
are
protected
to
RTCA/DO
‐
160G,
Section
22
Level
3
Pin
Injection
Test
Waveform
Set
A
(3
&
4),
Set
B
(3
&
5A)
and
Set
Z
(3
&
5B)
when
used
with
the
recommended
13kohm
series
input
resistors.
For
more
details
please
see
the
latest
datasheet.
The
level
of
lightning
protection
can
be
increased
by
using
external
components,
please
see
the
Application
Notes
available
on
Holt’s
website
http://www.holtic.com
.
The
layout
of
a
HI
‐
8475
board
should
always
have
low
conductivity
paths
from
the
device
power/ground
pin
to
the
relevant
power
or
ground
origin.
These
paths
should
avoid
proximity
to
sense
or
other
signal
traces;
this
applies
to
above
and
below
as
well
as
horizontally.
It
is
good
practice
to
have
a
power
and
ground
‘moat’
beneath
the
sense
line
to
prevent
disturbance
on
these
lines
during
a
‘lightning’
event.
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