Datasheet

16
LTC1546
Figure 30. Controller-Selectable DCE Port with DB-25 Connector
D2
D1
LTC1544
CTS
NC
DSR
DTR
DCD
RTS
D3
R2
R1
R4
R3
LTC1546
LL
RXD
RXC
TXC
SCTE
TXD
M0
M1
M2
DCE/DTE
V
CC
V
DD
V
CC
V
EE
GND
3
16
17
9
15
12
24
11
2
1
5
13
6
8
22
10
20
23
4
19
18
7
14
1546 F30
C2
1µF
C1
1µF
C5
1µF
C3
1µF
C4
3.3µF
RXC B
CTS A (106)
CTS B
DSR A (107)
DSR B
RTS A (105)
RTS B
LL A (141)
SGND (102)
SHIELD (101)
DB-25 FEMALE
CONNECTOR
DCD A (109)
DCD B
DTR A (108)
DTR B
D4
V
CC
5V
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
NC
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
C11
1µF
C10
1µF
C9
1µF
M0
M1
M2
DCE/DTE
M0
M1
M2
11
12
13
14
D1
T
T
T
T
T
D2
D3
R1
R2
R3
RXD A (104)
RXD B
TXC A (114)
SCTE A (113)
TXD A (103)
TXC B
SCTE B
TXD B
RXC A (115)
TYPICAL APPLICATIO S
U