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LTC2872IUHF#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
LTC2872
22
2872f
Typical applicaTions
Figure 20. LTC2872 in Various Basic Port Configurations
Figure 21. Loopback in
RS232 and RS485 Modes
Figure 22. Half-Duplex RS485
Mode with Driver and Receiver Line
Termination on Each Port
Figure 23. Full-Duplex RS485 Mode
with Driver and Receiver Line
Termination on Port 1, and Receiver-
Only Termination on Port 2
V
L
DY1
DZ1
Y1
Z1
RA1
RB1
A1
B1
DY2
Y2
Z2
RA2
A2
B2
2872 F21
LTC2872
LB
485/232_2
485/232_1
RXEN1
RXEN2
H/F
GND
V
L
2872 F22
LTC2872
H/F
TE485_1
TE485_2
485/232_1
485/232_2
DZ1
DZ2
LB
GND
DY1
120Ω
Y1
Z1
RA1
A1
B1
120Ω
DY2
120Ω
Y2
Z2
RA2
A2
B2
120Ω
V
L
2872 F23
LTC2872
TE485_1
TE485_2
DZ1
485/232_1
485/232_2
DZ2
H/F
LB
GND
DY2
Y2
Z2
RA2
A2
B2
120Ω
DY1
Y1
Z1
RA1
A1
B1
120Ω
120Ω
V
CC
= 3V to 5.5V, V
L
= 1.7V to V
CC
. Logic input pins not shown are tied to a valid logic
state. External components necessary for operation are not shown.
2872 F20
485/232_1
485/232_2
LB
DY1
DZ1
Y1
Z1
RA1
RB1
A1
B1
DY2
DZ2
Y2
Z2
RA2
RB2
A2
B2
LTC2872
PORT 1: RS232
PORT 2: RS232
PORT 1: RS232
PORT 2: RS485
PORT 1: RS485
PORT 2: RS232
PORT 1: RS485
PORT 2: RS485
DY1
DZ1
Y1
Z1
RA1
RB1
A1
B1
DY2
Y2
Z2
RA2
A2
B2
LTC2872
485/232_2 485/232_1
H/F
LB
GND
DY2
DZ2
Y2
Z2
RA2
RB2
A2
B2
DY1
Y1
Z1
RB1
A1
B1
LTC2872
485/232_1 485/232_2
H/F
LB
GND
DY1
V
L
V
L
V
L
Y1
Z1
RA1
A1
B1
LTC2872
485/232_1
485/232_2
H/F
LB
GND
DY2
Y2
Z2
RA2
A2
B2
LTC2872
23
2872f
Typical applicaTions
Figure 24. Typical RS485 Half Duplex Network
2872 F25
½ LTC2872
MASTER
120Ω
½ LTC2872
½ LTC2872
SLAVE
TE485
H/F
TE485
DZ
H/F
TE485
DZ
H/F
V
L
V
L
120Ω
120Ω
Figure 25. Typical RS485 Full Duplex Network
2872 F24
½ LTC2872
120Ω
½ LTC2872
½ LTC2872
TE485
H/F
TE485
DZ
H/F
TE485
DZ
H/F
V
L
V
L
V
L
120Ω
V
CC
= 3V to 5.5V, V
L
= 1.7V to V
CC
. Logic input pins not shown are tied to a valid logic
state. External components necessary for operation are not shown.
LTC2872
24
2872f
Typical applicaTions
Figure 26. RS485 Receiver with 4-Way Selectable Inputs
2872 F26
H/F
RA1
RXEN1
RS485
INTERFACE
INPUT1
INPUT2
Y1
Z1
A1
B1
LTC2872
S3
H/F
RA2
RXEN2
INPUT3
INPUT4
Y2
Z2
A2
B2
S1
OUTPUT
S2
S2
1
1
0
0
1
0
S1
0
0
1
1
1
0
SELECTED INPUT
INPUT1
INPUT2
INPUT3
INPUT4
NONE/Hi-Z
INVALID
S3
1
0
1
0
X
X
V
CC
= 3V to 5.5V, V
L
= 1.7V to V
CC
. Logic input pins not shown are tied to a valid logic
state. External components necessary for operation are not shown.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28

LTC2872IUHF#PBF

Mfr. #:
Buy LTC2872IUHF#PBF
Manufacturer:
Analog Devices Inc.
Description:
RS-232 Interface IC RS232/RS485 Dual Port Multiprotocol Transceiver with Integrated Termination (Shared I/O)
Lifecycle:
New from this manufacturer.
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