Datasheet

18
LTC1546
Figure 32. Controller-Selectable Multiprotocol DTE/DCE Port with RL, LL, TM and DB-25 Connector
10
17
18
D2
D1
LTC1545
D3
R2
R1
R3
V
CC
V
DD
V
EE
GND
D4
1,19
2,20
3
4
5
6
7
8
9
R4EN
D4ENB
15
16
NC
24
23
22
25
26
27
28
29
30
31
32
33
34
35
36
M0
M1
M2
DCE/DTE
M0
M1
M2
DCE/DTE
11
12
13
14
D5
21
R4
R5
18
*
*OPTIONAL
21
25
LL
LL
RL
RLTM
TM
RI
RI
LTC1546
DTE_TXD/DCE_RXD
DTE_TXC/DCE_TXC
DTE_RXC/DCE_SCTE
DTE_RXD/DCE_TXD
DTE_RTS/DCE_CTS
DTE_DTR/DCE_DSR
DTE_DCD/DCE_DCD
DTE_DSR/DCE_DTR
DTE_CTS/DCE_RTS
DTE_LL/DCE_RI
DTE_RI/DCE_LL
DTE_TM/DCE_RL
DTE_RL/DCE_TM
DTE_SCTE/DCE_RXC
M0
M1
M2
DCE/DTE
V
CC
5V
2
14
24
11
15
12
17
9
3
1
4
19
20
8
23
10
6
22
5
13
7
16
1546 F32
C2
1µF
C1
1µF
C5
1µF
C3
1µF
C4
3.3µF
TXD A
TXD B
SCTE A
SCTE B
RXD A
RXD B
RXC A
RXC B
RXC A
RXC B
RXD A
RXD B
RTS A
RTS B
DTR A
DTR B
CTS A
CTS B
DSR A
DSR B
CTS A
CTS B
SG
SHIELD
DB-25
CONNECTOR
TXC A
TXC B
SCTE A
SCTE B
TXD A
TXD B
TXC A
TXC B
DCD A
DCD B
DSR A
DSR B
RTS A
RTS B
DCD A
DCD B
DTR A
DTR B
V
CC
5V
CHARGE
PUMP
+
28
3
1
2
4
5
6
7
8
9
10
11
12
13
14
27
26
25
24
23
22
21
20
19
18
17
16
15
DTE DCE
C11
1µF
C10
1µF
C9
1µF
T
T
T
T
T
D1
D2
D3
R1
R2
R3
TYPICAL APPLICATIO S
U