Datasheet

15
LTC1546
Figure 29. Controller-Selectable Multiprotocol DTE Port with DB-25 Connector
D2
D1
LTC1544
RTS
DTR
DSR
DCD
CTS
D3
R2
R1
R4
R3
LTC1546
LL
TXD
SCTE
TXC
RXC
RXD
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
1546 F29
C2
1µF
C1
1µF
C5
1µF
C3
1µF
C4
3.3µF
SCTE B
RTS A (105)
RTS B
DTR A (108)
DTR B
CTS A (106)
CTS B
LL A (141)
SG
SHIELD
DB-25 MALE
CONNECTOR
DCD A (109)
DCD B
DSR A (107)
DSR 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
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
D2
D3
R1
R2
R3
TXD A (103)
TXD B
TXC A (114)
RXC A (115)
RXD A (104)
TXC B
RXC B
RXD B
SCTE A (113)
T
T
T
T
T
TYPICAL APPLICATIO S
U