Datasheet

LTC2870/LTC2871
13
28701f
TEST CIRCUITS
Figure 1. RS485 Driver DC Characteristics Figure 2. RS485 Driver Output Current
Figure 3. RS485 Receiver Input Current and Resistance (Note 5)
Figure 4. RS485 Driver Timing Measurement
28701 F01
DRIVER
DY/DI
GND
OR
V
L
Y
R
L
R
L
Z
V
OD
+
–
V
OC
+
–
28701 F02
DRIVER
Y OR Z
DY/DI
GND
OR
V
L
Z OR Y
V
OUT
I
OZD485
, I
OSD485
+
–
28701 F03
RECEIVER
A OR B
B OR A
V
IN
I
IN485
R
IN485
=
V
IN
I
IN485
+
–
28701 F04
DRIVER
DY/DI
Y
Z
R
DIFF
C
L
C
L
t
PLHD485
t
SKEWD485
t
PLHD485
t
RD485
t
FD485
90%
0V
V
OD
½V
OD
V
L
0V
DY/DI
Y, Z
Y - Z
10%
90%
0V
10%