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LTC2845 Datasheet, PDF (8/20 Pages) Linear Technology – 3.3V Software-Selectable Multiprotocol Transceiver
◁
LTC2845
W
U
ODE SELECTIO
MODE NAME
Not Used
(Default V.11)
RS530A
RS530
X.21
V.35
RS449/V.36
V.28/RS232
No Cable
Not Used
(Default V.11)
RS530A
RS530
X.21
V.35
RS449/V.36
V.28/RS232
No Cable
M2
M1
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
(Note 1)
(Note 4) (Note 1)
M0 DCE D1, D2, D3
D1
/DTE D4, D5
A
B
D2
A
B
D3
A
B
(Note 4)
D4A
D5A
0
0
TTL
X
V.11 V.11 V.11 V.11
Z
Z
V.10
1
0
TTL
X
V.11 V.11 V.10
Z
Z
Z
V.10
0
0
TTL
X
V.11 V.11 V.11 V.11
Z
Z
V.10
1
0
TTL
X
V.11 V.11 V.11 V.11
Z
Z
V.10
0
0
TTL
X
V.28
Z
V.28
Z
Z
Z
V.28
1
0
TTL
X
V.11 V.11 V.11 V.11
Z
Z
V.10
0
0
TTL
X
V.28
Z
V.28
Z
Z
Z
V.28
1
0
X
X
Z
Z
Z
Z
Z
Z
Z
0
1
TTL TTL V.11 V.11 V.11 V.11 V.11 V.11 V.10
1
1
TTL TTL V.11 V.11 V.10
Z
V.11 V.11 V.10
0
1
TTL TTL V.11 V.11 V.11 V.11 V.11 V.11 V.10
1
1
TTL TTL V.11 V.11 V.11 V.11 V.11 V.11 V.10
0
1
TTL TTL V.28
Z
V.28
Z
V.28
Z
V.28
1
1
TTL TTL V.11 V.11 V.11 V.11 V.11 V.11 V.10
0
1
TTL TTL V.28
Z
V.28
Z
V.28
Z
V.28
1
1
X
X
Z
Z
Z
Z
Z
Z
Z
MODE NAME
Not Used
(Default V.11)
RS530A
RS530
X.21
V.35
RS449/V.36
V.28/RS232
No Cable
Not Used
(Default V.11)
RS530A
RS530
X.21
V.35
RS449/V.36
V.28/RS232
No Cable
(Note 2)
M2
M1
M0
DCE
R1
/DTE
A
B
(Note 2)
R2
A
B
0
0
0
0
V.11 V.11 V.11 V.11
0
0
1
0
V.11 V.11 V.10 30k
0
1
0
0
V.11 V.11 V.11 V.11
0
1
1
0
V.11 V.11 V.11 V.11
1
0
0
0
V.28 30k V.28 30k
1
0
1
0
V.11 V.11 V.11 V.11
1
1
0
0
V.28 30k V.28 30k
1
1
1
0
30k
30k
30k
30k
0
0
0
1
30k 30k V.11 V.11
0
0
1
1
30k 30k V.10 30k
0
1
0
1
30k 30k V.11 V.11
0
1
1
1
30k 30k V.11 V.11
1
0
0
1
30k 30k V.28 30k
1
0
1
1
30k 30k V.11 V.11
1
1
0
1
30k 30k V.28 30k
1
1
1
1
30k
30k
30k
30k
Note 1: Driver inputs are TTL level compatible.
Note 2: Unused receiver inputs are terminated with 30k to ground.
Note 3: Receiver outputs are CMOS level compatible and have a weak pull-up to VIN when Z.
Note 4: Driver 4 is enabled by D4ENB=0 (Pin 15).
Note 5: Receiver 4 is enabled by R4EN=1 (Pin 16).
(Note 2)
R3
A
B
(Note 2)
(Note 5) (Note 3)
R4A R1
R5A
(Note 3)
(Note 5)
R2, R3
R4, R5
V.11 V.11 V.10 CMOS CMOS
V.11 V.11 V.10 CMOS CMOS
V.11 V.11 V.10 CMOS CMOS
V.11 V.11 V.10 CMOS CMOS
V.28 30k V.28 CMOS CMOS
V.11 V.11 V.10 CMOS CMOS
V.28 30k V.28 CMOS CMOS
30k
30k 30k
Z
Z
V.11 V.11 V.10
Z
CMOS
V.11 V.11 V.10
Z
CMOS
V.11 V.11 V.10
Z
CMOS
V.11 V.11 V.10
Z
CMOS
V.28 30k V.28
Z
CMOS
V.11 V.11 V.10
Z
CMOS
V.28 30k V.28
Z
CMOS
30k
30k 30k
Z
Z
8
sn2845 2845fs
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