Datasheet

19
LTC2846
sn2846 2846fs
Figure 31. Controller-Selectable Multiprotocol DTE Port with DB-25 Connector
D2
D1
LTC2844
RTS
DTR
DSR
DCD
CTS
D3
R2
R1
R4
R3
LTC2846
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
2846 F31
C2
1µF
R1
13k
C1
1µF
C6
10µF
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
SHDN
V
IN
3.3V
CHARGE
PUMP
BOOST
SWITCHING
REGULATOR
L1
5.6µH
+
33
7
35
4
36
D1
MBR0520
3
5
6
8
9
10
11
12
13
14
15
16
18
19
1
2
3
4
5
6
7
8
10
9
V
IN
15
V
IN
3.3V
16
17
18
19
20
21
22
23
24
25
32
31
30
29
28
27
26
25
24
23
22
21
20
17
V
IN
3.3V
26
27
28
C5
10µF
C9
1µF
C7
1µF
C8
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
C10
1µF
R2
4.3k
V
CC
5V
TYPICAL APPLICATIO S
U