LTC1344A_15 Datasheet, PDF (9/12 Pages) Linear Technology – Software-Selectable Cable Terminator

LTC1344A
TYPICAL APPLICATIONS N
Controller Selectable Multiprotocol DTE/DCE Port with DB-25 Connector
C6 C7 C8
100pF 100pF 100pF
DTE_LL/DCE_TM
DTE_TXD/DCE_RXD
DTE_SCTE/DCE_RXC
DTE_TXC/DCE_TXC
DTE_RXC/DCE_SCTE
DTE_RXD/DCE_TXD
DTE_TM/DCE_LL
LB
DTE_RTS/DCE_CTS
DTE_DTR/DCE_DSR
DTE_DCD/DCE_DCD
DTE_DSR/DCE_DTR
DTE_CTS/DCE_RTS
DTE_RL/DCE_RL
DCE/DTE
M2
M1
M0
V_CC
5V
1
44
C3
1µF
C1
1µF
2
43
4
CHARGE
PUMP
42
3
41
C5
8
1µF
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
26
20
CTRL
DCE ²¹
22
LATCH
19
M2
11
INVERT
18
M1
25 _423SET
17
M0
R1
100k _{40 GND LB}
V_CC
24
EC
23
C9, 1µF
C10
1µF
V_CC
1 _VCC
2 _VDD
3
D1
4
D2
28
V_{EE 27}
GND
26
25
24
23
5
D3
C13
1µF
C2
1µF
C4
3.3µF
14
V_CC
2 _VEE
C12
1µF
C11
1µF
3 8 11 12 13
LTC1344A
21
LATCH
5 4 6 7 9 10 16 15 18 17 19 20 22 23 24 1
DTE
18 _{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}
7
SG
1
SHIELD
TXC A
TXC B
SCTE A
SCTE B
TXD A
TXD B
LL A
DB-25
CONNECTOR
4 _{RTS A}
19 _{RTS B}
20
DTR A
23
DTR B
CTS A
CTS B
DSR A
DSR B
LTC1544
22
6
R1
21
20
7
R2
19
18
8
R3
17
10
16
R4
9
D4
11
M0
15
INVERT
NC
12
M1
13
M2
14
DCE/DTE
8
DCD A
10
DCD B
6
DSR A
22
DSR B
5
CTS A
13
CTS B
21
RL A
DCD A
DCD B
DTR A
DTR B
RTS A
RTS B
RL A
1344A TA04
9