LTC2846 Linear Technology, LTC2846 Datasheet - Page 23

• Manufacturer Part Number: LTC2846
• Description: 3.3V Software-Selectable Multiprotocol Transceiver with Termination
• Manufacturer: Linear Technology

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TYPICAL APPLICATIO S
4
DTE_SCTE/DCE_RXC
DTE_RXC/DCE_SCTE
DTE_DTR/DCE_DSR
DTE_DCD/DCE_DCD
DTE_DSR/DCE_DTR
DTE_TXD/DCE_RXD
DTE_RXD/DCE_TXD
DTE_TXC/DCE_TXC
DTE_RTS/DCE_CTS
DTE_CTS/DCE_RTS
3.3V
V
IN
1 F
C7
C6
10 F
V
5V
CC
Figure 35. Cable-Selectable Multiprotocol DTE/DCE Port with DB-25 Connector
C3
1 F
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
1 F
C1
C8
1 F
SHDN
U
NC
NC
V
CC
10
11
12
13
14
15
16
18
19
10
11
12
13
14
4
7
5
6
8
9
1
2
3
4
5
6
7
8
9
V
V
M0
M1
M2
DCE/DTE
M0
M1
M2
DCE/DTE
3
CC
DD
REGULATOR
SWITCHING
D3
D1
D2
LTC2844
CHARGE
LTC2846
D1
D2
D3
D4
BOOST
PUMP
5.6 H
R1
R2
R3
R1
R2
R3
R4
L1
T
T
T
T
T
GND
V
V
EE
IN
36
27
25
24
23
22
21
20
19
18
17
16
15
35
33
32
31
30
29
28
26
25
24
23
22
21
20
17 V
28
27
26
3.3V
IN
MBR0520
+
D1
C2
1 F
C4
3.3 F
C10
1 F
V
3.3V
IN
C9
1 F
R1
13k
R2
4.3k
C5
10 F
CABLE WIRING FOR
DTE/DCE SELECTION
CABLE WIRING FOR MODE SELECTION
RS449, V.36
MODE
MODE
RS232
DTE
DCE
V.35
V
5V
CC
PIN 25
PIN 7
PIN 18
PIN 7
PIN 7
NC
NC
PIN 21
PIN 7
PIN 7
NC
14
24
11
15
12
17
16
25
21
18
19
20
23
10
22
13
8
6
5
2
9
3
7
1
4
DTE
TXD A
TXD B
SCTE A
SCTE B
TXC A
TXC B
RXC A
RXC B
RXD A
RXD B
SG
SHIELD
DCE/DTE
M1
M0
RTS A
RTS B
DTR A
DTR B
DCD A
DCD B
DSR A
DSR B
CTS A
CTS B
CONNECTOR
DB-25
LTC2846
RXD A
RXD B
RXC A
RXC B
DCE
TXC A
TXC B
SCTE A
SCTE B
TXD A
TXD B
CTS A
CTS B
DSR A
DSR B
DCD A
DCD B
DTR A
DTR B
RTS A
RTS B
2846 F35
sn2846 2846fs
23