Datasheet

16
LTC1544
Figure 23. Controller-Selectable DCE Port with DB-25 Connector
D2
D1
LTC1544
CTS
DSR
DTR
DCD
RTS
D3
R2
R1
R4
R3
D2
LTC1543
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
1544 F23
D3
R2
R1
R3
D1
C2
1µF
C1
1µF
C5
1µF
C3
1µF
C4
3.3µF
RXD A (104)
RXD B
RXC A (115)
RXC B
SCTE A (113)
SCTE B
TXD A (103)
TXD 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
TXC A (114)
TXC B
DCD A (109)
DCD B
DTR A (108)
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
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
NC
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
NC
27
26
25
24
23
22
21
20
19
18
17
16
15
26
27
28
V
EE
M0
M1
M2
DCE/DTE
M2
M1
M0
11
12
13
14
21
LATCH
C12
1µF
C13
1µF
C11
1µF
C10
1µF
C9
1µF
TYPICAL APPLICATIO S
U