
13
LTC1545
Figure 22. Controller-Selectable Multiprotocol DTE Port with DB-25 Connector
10
17
18
D2
D1
LTC1545
RTS
DTR
DSR
DCD
CTS
D3
R2
R1
R3
D2
LTC1543
LL
RI
TM
TXD
SCTE
TXC
RXC
RXD
M0
M1
M2
DCE/DTE
VCC
VDD
VCC
5V
VEE
GND
2
21
14
24
11
15
12
17
9
3
1
4
19
20
8
23
10
6
22
5
13
18
25
*
*OPTIONAL
21
7
16
1544 F22
D3
R2
R1
R3
D1
C2
1
F
C1
1
F
C5
1
F
C3
1
F
C4
3.3
F
TXD A (103)
TXD B
SCTE A (113)
SCTE B
RXC A (115)
RXC B
RXD A (104)
RXD B
RTS A (105)
RTS B
DTR A (108)
DTR B
CTS A (106)
CTS B
SG
SHIELD
DB-25 MALE
CONNECTOR
TXC A (114)
TXC B
DCD A (109)
DCD B
DSR A (107)
DSR B
D4
16
10
9
7
6
4
3
8
11
12
13
5
2
15 18 17 19 20 22
LTC1344A
LATCH
C6
100pF
C7
100pF
C8
100pF
VCC
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
1,19
2,20
3
4
5
6
7
8
9
R4EN
D4ENB
15
16
24
23
22
25
26
27
28
29
30
31
32
33
NC
27
26
25
24
23
22
21
20
19
18
17
16
15
34
35
36
VEE
M0
M1
M2
DCE/DTE
M0
M1
M2
11
12
13
14
C12
1
F
C13
1
F
C11
1
F
C10
1
F
C9
1
F
RL
D5
21
R4
R5
LL (141)
RI (125)
TM (142)
RL (140)
TYPICAL APPLICATIONS
U