Datasheet

CANH
CANL
5 V
Vac
R
500 mV
900 mV
R1 R2
+
–
12 V
–7 V
R1+1%
R1+1%
R2+1%
R2+1%
V
I
V
I
V
ID
50 W
50 W
450 W
227 W
V
ID
SN55HVD251
SN65HVD251
www.ti.com SLLS545E –NOVEMBER 2002–REVISED MARCH 2010
DEVICE INFORMATION
A. All input pulses are supplied by a generator having the following characteristics: f
IN
< 1.5 MHz, T
A
= 25°C, V
CC
= 5 V.
B. The receiver output should not change state during application of the common-mode input waveform.
Figure 13. Common-Mode Input Voltage Rejection Test
FUNCTION TABLES
Table 2. DRIVER
INPUTS OUTPUTS
Voltage at R
s
, V
Rs
BUS STATE
D CANH CANL
L V
Rs
< 1.2 V H L Dominant
H V
Rs
< 1.2 V Z Z Recessive
Open X Z Z Recessive
X V
Rs
> 0.75 V
CC
Z Z Recessive
X Open Z Z Recessive
Table 3. RECEIVER
DIFFERENTIAL INPUTS [V
ID
= V(CANH) - V(CANL)] OUTPUT R
(1)
V
ID
≥ 0.9 V L
0.5V < V
ID
< 0.9 V ?
V
ID
≤ 0.5 V H
Open H
(1) H = high level; L = low level; X = irrelevant; ? = indeterminate; Z = high impedance
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