Datasheet

LTC2870/LTC2871
16
28701fb
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TesT circuiTs
Figure8. RS485 Termination Resistance and Timing Measurements (Note 5)
Figure9. RS232 Driver Timing and Slew Rate Measurements
Figure10. RS232 Driver Enable and Disable Times
28701 F08
RECEIVER
V
AB
A
B
V
AB
I
A
R
TERM
=
V
B
½V
L
½V
L
TE485
I
A
I
A
90%
10%
t
RTZ485
t
RTEN485
0V
V
L
TE485
+
–
+
–
28701 F09
DRIVER
INPUT
DRIVER
OUTPUT
C
L
R
L
t
PHLD232
t
PLHD232
t
SKEWD232
= |t
PHLD232
– t
PLHD232
|
t
F
t
R
DRIVER
INPUT
DRIVER
OUTPUT
SLEW RATE =
6V
t
F
OR t
R
3V
–3V
0V
V
OLD
V
L
½V
L
½V
L
0V
3V
–3V
0V
V
OHD
28701 F10
0V OR V
L
DXEN/DX232
DRIVER
OUTPUT
C
L
R
L
t
HZD232
t
LZD232
DXEN/
DX232
DRIVER
OUTPUT
DRIVER
OUTPUT
0.5V
t
ZHD232
t
ZLD232
5V
5V
0.5V
0V
0V
0V
V
OHD
V
L
½V
L
½V
L
V
OLD
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