Datasheet

18
LTC2847
sn2847 2847fs
Figure 31. Controller-Selectable Multiprotocol DTE/DCE Port with DB-25 Connector
TYPICAL APPLICATIO S
U
D2
D1
LTC2845
D3
R2
R1
R4
R3
LTC2847
M0
M1
M2
DCE/DTE
V
CC
V
DD
V
EE
GND
2847 F31
C2
1µF
C1
1µF
C3
1µF
C4
3.3µF
D4
D5
V
CC
5V
CHARGE
PUMP
+
DCE/DTE
V
IN
D4ENB
R4EN
15
V
IN
3.3V
C9
1µF
C7
1µF
C8
1µF
M0
M1
M2
DCE/DTE
M0
M1
M2
D1
D2
D3
R1
R2
R3
C5
1µF
C6
1µF
T
T
T
T
T
C10
1µF
DTE_TXD/DCE_RXD
DTE_SCTE/DCE_RXC
DTE_TXC/DCE_TXC
DTE_RXC/DCE_SCTE
DTE_RXD/DCE_TXD
DTE_RTS/DCE_CTS
DTE_DTR/DCE_DSR
DTE_DCD/DCE_DCD
DTE_DSR/DCE_DTR
DTE_CTS/DCE_RTS
DTE_LL/DCE_RI
DTE_RI/DCE_LL
DTE_TM/DCE_RL
DTE_RL/DCE_TM
2
14
24
11
15
12
17
9
3
1
4
19
20
8
23
10
6
22
5
13
18
*
25
21
7
16
SCTE B
RTS A
RTS B
DTR A
DTR B
CTS A
CTS B
DSR A
DSR B
CTS A
CTS B
SG
SHIELD
DB-25
CONNECTOR
DCD A
DCD B
DSR A
DSR B
RTS A
RTS B
DCD A
DCD B
DTR A
DTR B
TXD A
TXD B
TXC A
RXC A
RXD A
TXC B
RXC B
RXD B
TXC A
SCTE A
TXD A
TXC B
SCTE B
TXD B
SCTE A
RXC B
RXD A
DTE DCE
RXD B
RXC A
V
IN
3.3V
R5
LL
RI
TM
RL
LL
RI
TM
RL
*OPTIONAL
NC