LTC1344_15 Datasheet, PDF (10/12 Pages) Linear Technology – Software-Selectable Cable Terminator

LTC1344
TYPICAL APPLICATIONS N
Controller Selectable Multiprotocol DTE Port with DB-25 Connector
C6 C7 C8
100pF 100pF 100pF
DTE_LL/DCE_TM
DTE_TXD/DCE_RXD
DTE_SCT/DEC_RXC
DTE_TXC/DCE_TXC
DTE_RXC/DCE_SCTE
DTE_RXD/DCE_TXD
DTE_TM/DCE_LL
DTE_RL/DCE_RL
DTE_RTS/DCE_CTS
DTE_DTR/DCE_DSR
DTE_DCD/DCE_DCD
DTE_DSR/DCE_DTR
DTE_CTS/DCE_RTS
LATCH
10
LB
DCE/DTE
M2
M1
M0
V_CC
5V
C3
1µF _C1
1µF
C5
1µF
R1
100k
1
44
2
43
4
42
CHARGE
3
PUMP
8
41
LTC1343
5
39
D1
38
6
D2
37
36
7
D3
35
34
9
D4
33
10
12
13
32
R1
31
14
30
R2
29
28
15
R3
27
16
R4
20
22 ^CTRL
LATCH
11
INVERT
25 _{423 SET}
26
21
DCE
19
M2
18
M1
17
M0
40
23 ^GND
LB
24
EC
14
V_CC
C2
1µF
2
C4
V_EE
3.3µF
V_CC
3
8
11 12 13
LTC1344
21
LATCH
DCE/
DTE M2 M1 M0
5 4 6 7 9 10 16 15 18 17 19 20 22 23 24 1
DB-25 CONNECTOR
18 ^DTE
LL A
2 _{TXD A}
14 _{TXD B}
24
SCTE A
11 _{SCTE B}
DCE
TM A
RXD A
RXD B
RXC A
RXC B
15 _{TXC A}
12 _{TXC B}
17 _{RXC A}
9 _{RXC B}
3 _{RXD A}
16 _{RXD B}
25 _{TM A}
TXC A
TXC B
SCTE A
SCTE B
TXD A
TXD B
LL A
7
SGND
C11
1µF _C9
1µF
V_CC
C12
1µF
V_CC
R2
100k
1
44
2
43
4
42
CHARGE
3
PUMP
8
41
LTC1343
5
D1
39
38
6
D2
37
36
7
D3
35
34
9
D4
33
10
12
32
13
R1
31
30
14
R2
29
28
15
R3
27
16
R4
20
CTRL
22
11 ^LATCH
25 ^INVERT
423 SET
26
DCE ²¹
M2 ¹⁹
M1 ¹⁸
M0 ¹⁷
40
23 ^GND
LB
24
EC
C10
1µF
C13
3.3µF
1 ^SHIELD
21
RL A
4 _{RTS A}
19 _{RTS B}
20 _{DTR A}
23 _{DTR B}
RL A
CTS A
CTS B
DSR A
DSR B
8 _{DCD A}
10
6
DCD B
22 ^{DSR A}
DSR B
5 _{CTS A}
13 _{CTS B}
DCD A
DCD B
DTR A
DTR B
RTS A
RTS B
1344 TA02