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Rs
CANH
CANH
D
10%
90%
0.9v
0 v
0.5v
(看 便条一个)
+
_
R
L
=
60
1%
C
L
=
50 pf
20%
(看 便条 b)
V
O
V
I
V
i(rs)
t
PLH
t
PHL
V
CC
V
o(d)
V
o(r)
t
f
t
r
V
I
V
O
V
cc/2
V
cc/2
CANH
CANL
R
V
ID
I
O
V
O
V
i(canh)
V
i(canl)
V
i(canh)
+
V
i(canl)
2
V
IC
=
1.5 v
CANH
CANL
R
(看 便条一个)
2 v
2.4 v
3.5 v
10%
90%
1.5 v
10%
V
O
C
L
= 15 pf
20% (看 便条 b)
I
O
V
I
0.7 v
CC
0.3 v
CC
V
OH
V
OL
t
PLH
t
PHL
t
f
t
r
V
I
V
O
SN65HVD251
SLLS545B–NOVEMBER2002–REVISEDSEPTEMBER2003
parametermeasurementinformation(持续)
figure4.drivertestcircuitandvoltagewaveforms
figure5.receivervoltageandcurrentdefinitions
一个.theinputpulseissuppliedbyageneratorhavingthefollowingcharacteristics:prr
≤
125khz,50%dutycycle,t
r
≤
6ns,t
f
≤
6ns,z
O
=50
Ω
.
b.c
L
includesinstrumentationandfixturecapacitancewithin
±
20%.
figure6.receivertestcircuitandvoltagewaveforms
7
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