Datasheet

LTC2870/LTC2871
29
28701fb
For more information www.linear.com/LTC2870
Figure33. LTC2871 in RS485 and
RS232 Mode, Both Half-Duplex
Figure34. LTC2871 in RS485 and RS232
Mode, RS485 Half-Duplex, Loopback
Figure35. LTC2871 in RS485
and RS232 Mode, RS485
Half-Duplex, Terminated
Figure36. RS485 Duplex Switching
Figure37. Microprocessor Interface
Figure38. Driving Larger
RS232 Loads
Typical applicaTions
28701 F32
DX485
H/F
V
L
CH2
TE485
RX485
RX232
LB
GND
LTC2871
DX232
D R 485
DIN1
ROUT2
DIN2
ROUT1
DOUT1
RIN2
DOUT2
RIN1
RO
DI
Z
Y
D R 232
28701 F33
DX232
DX485
LB
H/F
V
L
RX485
RX232
TE485
CH2
GND
LTC2871
DIN1
ROUT2
DIN2
ROUT1
DOUT1
RIN2
DOUT2
RIN1
RO
DI
Z
Y
28701 F34
DX232
H/F
DX485
RX485
V
L
RX232
LB
CH2
GND
LTC2871
DIN1
ROUT2
DIN2
ROUT1
DOUT1
RIN2
DOUT2
RIN1
RO
DI
120Ω
Z
Y
B
A
120Ω
D R 485
28701 F35
485/232
TE485
V
L
H/F
LB
RB
GND
RO
B
120Ω
A
LTC2870/
LTC2871
H/F
DI
DY
Z
120Ω
Y
HALF
DUPLEX
RS485
FULL
28701 F36
3V TO 5.5V
1.7V TO V
CC
V
CC
V
L
GND
LTC2870/
LTC2871
DY, DIN1
RB, ROUT2
DZ, DIN2
RA, ROUT1
Y
B
Z
A
CONTROL
SIGNALS
µP
28701 F37
LTC2870/
LTC2871
RS232
C
L
3k
DATA RATE
100kbps
500kbps
C
L
5nF
1nF
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 not shown.
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