Datasheet

17
LTC1544
Figure 24. Controller-Selectable Multiprotocol DTE/DCE Port with DB-25 Connector
D2
D1
LTC1544
D3
R2
R1
R4
R3
D2
LTC1543
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_LL
DTE_SCTE/DCE_RXC
M0
M1
M2
DCE/DTE
V
CC
V
DD
V
CC
V
EE
GND
2
14
24
11
15
12
17
9
3
1
4
19
20
8
23
10
6
22
5
13
18
7
16
1544 F24
D3
R2
R1
R3
D1
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
LL 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
LL 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
+
28
3
1
2
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
5
6
7
8
10
9
INVERT
15
16
17
18
19
20
21
22
23
24
25
NC
27
26
25
24
23
22
21
20
19
18
17
16
15
26
27
28
V
EE
M0
M1
M2
DCE/DTE
DCE/DTE
M2
M1
M0
11
12
13
14
DTE DCE
21
LATCH
C12
1µF
C13
1µF
C11
1µF
C10
1µF
C9
1µF
TYPICAL APPLICATIO S
U