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LTC2858IMS-1(RevB) Ver la hoja de datos (PDF) - Linear Technology
Número de pieza
componentes Descripción
Lista de partido
LTC2858IMS-1
(Rev.:RevB)
20Mbps and Slew Rate Limited 15kV RS485/RS422 Transceivers
Linear Technology
LTC2858IMS-1 Datasheet PDF : 16 Pages
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LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
TEST CIRCUITS
±
V
AB
/2
V
CM
±
V
AB
/2
A
RECEIVER
B
RO
C
L
285678 F06a
V
AB
A-B
0
–V
AB
t
PLHR
t
PHLR
V
CC
RO
V
O
90%
10%
1/2 V
CC
90%
1/2 V
CC
10%
0
t
RR
285678 F06b
t
FR
t
SKEWR
= t
PLHR
– t
PHLR
Figure 6. Receiver Propagation Delay Measurements
0V OR V
CC
A
RO
RECEIVER
R
L
V
CC
OR
B
V
CC
OR 0V
RE
C
L
GND
DI = 0V OR V
CC
285678 F07a
V
CC
RE
0V
V
CC
RO
V
O
V
OL
V
OH
RO
0V
t
ZLR
,
t
ZLSR
1/2 V
CC
t
LZR
1/2 V
CC
1/2 V
CC
t
ZHR
,
t
ZHSR
t
HZR
Figure 7. Receiver Enable/Disable Time Measurements
0.5V
0.5V
285678 F05b
FUNCTION TABLES
LTC2856-1, LTC2856-2
LOGIC INPUTS
DE
RE
0
0
0
1
1
0
1
1
MODE
Receive
Shutdown
Transceive
Transmit
A, B
R
IN
R
IN
Driven
Driven
RO
Driven
High-Z
Driven
High-Z
LTC2858-1, LTC2858-2
LOGIC INPUTS
DE
RE
MODE
A, B
0
0
Receive
R
IN
0
1 Shutdown
R
IN
1
0 Transceive
R
IN
1
1
Transmit
R
IN
Y, Z
High-Z
High-Z
Driven
Driven
RO
Driven
High-Z
Driven
High-Z
285678fb
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