LTC1343 Linear Technology, LTC1343 Datasheet - Page 25

• Manufacturer Part Number: LTC1343
• Description: Software-Selectable Multiprotocol Transceiver
• Manufacturer: Linear Technology

APPLICATIONS
DTE_SCTE/DEC_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_CTS/ DCE_RTS
DTE_RTS/DCE_CTS
DTE_TXC/DCE_TXC
LB
U
+
V
+
CC
INFORMATION
C3
1 F
Figure 37. Cable-Selectable Multiprotocol DTE/DCE Port with DB-25 Connector
C11
1 F
U
V
+
+
V
CC
5V
CC
1 F
1 F
100k
100k
C9
C1
R1
C12
1 F
R2
C5
1 F
+
+
40
23
40
23
10
12
13
14
15
16
20
22
11
25
10
12
13
14
15
16
20
22
11
25
1
2
4
3
8
1
2
4
3
8
5
6
7
5
9
9
6
7
W
CTRL
LATCH
INVERT
423 SET
GND
LB
CTRL
LATCH
INVERT
423 SET
GND
LB
LTC1343
LTC1343
CHARGE
CHARGE
PUMP
PUMP
D1
D2
D3
D4
D1
D2
D3
D4
R2
R4
R2
R4
R1
R3
R1
R3
DCE
DCE
M2
M1
M0
M2
M1
M0
EC
EC
44
43
42
41
39
38
37
36
35
34
33
32
31
30
29
28
27
26
21
19
18
17
24
44
43
42
41
39
38
37
36
35
34
33
32
31
30
29
28
27
26
21
19
18
17
24
U
V
+
+
V
V
+
+
CC
CC
CC
C2
1 F
C4
3.3 F
C10
1 F
C13
3.3 F
14
2
V
V
CC
EE
100pF
C6
3
5
4
CABLE WIRING FOR MODE SELECTION
100pF
C7
EIA-530, RS449,
8
6
V.36, X.21
RS232
MODE
V.35
7
100pF
C8
V
CC
11
9
R3
10k
10
12
V
CC
PIN 18
16
PIN 7
PIN 7
13
R4
10k
NC
15
V
CC
18
R5
10k
PIN 21
PIN 7
PIN 7
NC
17
19
20 22 23 24 1
CABLE WIRING FOR DTE/DCE
SELECTION
DCE/
DTE
MODE
V
LTC1344
M2
DTE
DCE
CC
M1
LATCH
M0
PIN 25
PIN 7
21
NC
17
14
24
11
15
12
16
25
21
18
19
20
23
10
22
13
7
1
4
8
6
5
2
9
3
DB-25 CONNECTOR
TXD A
TXD B
SCTE A
SCTE B
TXC A
TXC B
RXC A
RXC B
RXD A
RXD B
SGND
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
DTE
LTC1343
TXC A
TXC B
SCTE A
SCTE B
TXD A
TXD B
DCD A
DCD B
DTR A
DTR B
RTS A
RTS B
RXD A
RXD B
RXC A
RXC B
CTS A
CTS B
DSR A
DSR B
1343 F37
DCE
25