ltc2845 Linear Technology Corporation, ltc2845 Datasheet - Page 17

• Manufacturer Part Number: ltc2845
• Description: 3.3v Software-selectable Mutiprotocol Transceiver
• Manufacturer: Linear Technology Corporation

TYPICAL APPLICATIONS
DCE/DTE
M0
M1
M2
DTE_SCTE/DCE_RXC
DTE_RXC/DCE_SCTE
DTE_TXD/DCE_RXD
DTE_RXD/DCE_TXD
DTE_TXC/DCE_TXC
Figure 25. Controller-Selectable Multiprotocol DTE/DCE Port with DB-25 Connector
1 F
C7
3.3V
V
IN
1 F
C8
C6
10 F
V
U
5V
CC
DTE_DTR/DCE_DSR
DTE_DCD/DCE_DCD
DTE_DSR/DCE_DTR
DTE_RTS/DCE_CTS
DTE_CTS/DCE_RTS
DTE_TM/DCE_RL
DTE_RL/DCE_TM
DTE_LL/DCE_RI
DTE_RI/DCE_LL
C3
1 F
V
DD
8V
1 F
C1
SHDN
V
V
M0
M1
M2
DCE/DTE
M0
M1
M2
DCE/DTE
CC
DD
REGULATOR
SWITCHING
LTC2845
D3
D1
D2
CHARGE
LTC2846
D1
D2
D3
D4
D5
BOOST
PUMP
5.6 H
R1
R2
R3
R1
R2
R4
R5
R3
L1
D4ENB
R4EN
GND
T
T
T
T
T
V
V
EE
IN
D1 MBR0520
V
3.3V
NC
+
IN
C2
1 F
C4
3.3 F
C10
1 F
V
–7.5V
EE
C9
1 F
V
3.3V
R1
13k
R2
4.3k
IN
C5
10 F
*OPTIONAL
14
24
11
15
12
17
16
19
20
23
10
22
13
18
25
21
V
5V
2
9
3
7
1
4
8
6
5
*
CC
SG
SG
SHIELD
RTS A
RTS B
DTR A
DTR B
DCD A
DCD B
DSR A
DSR B
CTS A
CTS B
LL
RI
TM
RL
DTE
TXD A
TXD B
SCTE A
SCTE B
TXC A
TXC B
RXC A
RXC B
RXD A
RXD B
CONNECTOR
DB-25
LTC2845
SCTE A
SCTE B
RXD A
RXD B
RXC A
RXC B
DSR A
DSR B
DCD A
DCD B
DTR A
DTR B
TXD A
TXD B
RTS A
RTS B
TXC A
TXC B
CTS A
CTS B
2845 F25
DCE
TM
RL
LL
RI
sn2845 2845fs
17