Datasheet

17
LTC2847
sn2847 2847fs
Figure 30. Controller-Selectable DCE Port with DB-25 Connector
TYPICAL APPLICATIO S
U
D2
D1
LTC2845
CTS
DSR
DTR
DCD
RTS
D3
R2
R1
R4
R3
LTC2847
RI
LL
RL
TM
RXD
RXC
TXC
SCTE
TXD
M0
M1
M2
DCE/DTE
V
CC
V
DD
V
EE
GND
2
14
24
11
15
12
24
11
2
1
5
13
6
8
22
10
20
23
4
19
*
18
21
25
7
14
2847 F30
C2
1µF
C1
1µF
C3
1µF
C4
3.3µF
RXC B
CTS A (106)
CTS B
DSR A (107)
DSR B
RTS A (105)
RTS B
SGND (102)
SHIELD (101)
DB-25 FEMALE
CONNECTOR
DCD A (109)
DCD B
DTR A (108)
DTR B
D4
V
CC
5V
CHARGE
PUMP
+
NC
NC NC
V
IN
D4ENB
R4EN
V
IN
3.3V
C9
1µF
C7
1µF
C8
1µF
M0
M1
M2
DCE/DTE
M0
M1
M2
D1
D2
D3
R1
R2
R3
RXD A (104)
RXD B
SCTE A (113)
TXD A (103)
TXC B
SCTE B
TXD B
RXC A (115)
C5
1µF
C6
1µF
T
T
T
T
T
C10
1µF
V
IN
3.3V
TXC A (114)
*OPTIONAL
R5
D5
RI (125)
LL (141)
RL (140)
TM 9142)