Datasheet

18
LTC1544
Figure 25. Controller-Selectable Multiprotocol DTE/DCE Port with RL, LL, TM and DB-25 Connector
D2
D1
LTC1544
D3
R2
R1
R4
R3
D2
LTC1343
DTE_LL/DCE_TM
DTE_TXC/DCE_TXC
DTE_RXC/DCE_SCTE
DTE_RXD/DCE_TXD
DTE_TM/DCE_LL
DTE_RTS/DCE_CTS
DTE_DTR/DCE_DSR
DTE_DCD/DCE_DCD
DTE_DSR/DCE_DTR
DTE_CTS/DCE_RTS
DTE_RL/DCE_RL
DTE_TXD/DCE_RXD
DTE_SCTE/DCE_RXC
CTRL
LATCH
INVERT
423SET
GND
DCE
M2
M1
M0
EC
V
CC
V
DD
V
CC
V
EE
GND
2
18
14
24
11
15
12
17
9
3
1
4
19
20
8
23
10
6
22
5
13
21
7
16
25
1544 F25
D3
D4
R2
R3
R4
D1
C2
1µF
C1
1µF
C5
1µF
C3
1µF
C4
3.3µF
LL A
TXD A
TXD B
SCTE A
SCTE B
TM A
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
RL A
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
RL A
DCD A
DCD B
DTR A
DTR B
D4
16109764
3 8 11 12 13
5
2
15 18 17 19 20 22
LTC1344A
C6
100pF
C7
100pF
C8
100pF
V
CC
V
CC
5V
23 24
14
1
DCE/DTE M2 M1 M0
CHARGE
PUMP
+
44
3
1
2
4
5
8
6
7
9
10
12
13
14
15
16
20
22
11
1
R1
100k
2
3
4
5
6
7
8
10
9
INVERT
15
16
17
18
19
20
21
22
23
24
25
NC
43
42
41
39
38
37
36
35
34
33
32
31
30
29
28
27
26
21
19
18
17
24
26
27
28
V
EE
M0
M1
M2
DCE/DTE
DCE/DTE
M2
M1
M0
11
12
13
14
DTE DCE
R1
25
40
23
V
CC
LB
LB
TM A LL A
21
LATCH
C12
1µF
C13
1µF
C11
1µF
C10
1µF
C9
1µF
TYPICAL APPLICATIO S
U