Техническая Спецификация для Linear Technology LTM2881-5 RS485 µModule Isolator Demo Board (5.0V Supply) DC1503A-B DC1503A-B
Модели
DC1503A-B
LTM2881
11
2881ff
For more information
TesT circuiTs
A
B
0V OR V
CC2
V
CC2
OR 0V
RO
RE
C
L
R
L
V
L
OR
GND
2881 F07a
RECEIVER
t
ZLR
t
ZHR
t
HZR
t
LZR
1/2 V
L
1/2 V
L
1/2 V
L
RE
RO
RO
V
L
V
L
V
OL
V
OH
0V
0V
0.5V
0.5V
2881 F07b
Figure 7. Receiver Enable/Disable Time Measurements
t
RTEN
t
RTZ
V
L
B
A
I
A
TE
2881 F08
RECEIVER
90%
10%
0V
TE
+–
+–
V
AB
V
B
R
TE
=
I
A
V
AB
1/2 V
L
RO
I
A
Figure 8. Termination Resistance and Timing Measurements
FuncTional Table
LOGIC INPUTS
MODE
A, B
Y, Z
RO
DC/DC
CONVERTER
TERMINATOR
ON
RE
TE
DE
1
0
0
0
Receive
R
IN
Hi-Z
Enabled
On
Off
1
0
0
1
Transceiver
R
IN
Driven
Enabled
On
Off
1
1
0
1
Transmit
R
IN
Driven
Hi-Z
On
Off
1
0
1
0
Receive + Term On
R
TE
Hi-Z
Enabled
On
On
0
X
X
X
Off
R
IN
Hi-Z
Hi-Z
Off
Off