LTC1544 Просмотр технического описания (PDF) - Linear Technology
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LTC1544 Datasheet PDF : 20 Pages
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LTC1544
TYPICAL APPLICATIO S
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
C10
1µF
DTE_RTS/DCE_CTS
DTE_DTR/DCE_DSR
VCC
5V
1
44
C3
1µF C1
1µF
2
43
4
CHARGE
PUMP
42
3
41
C5
8
1µF
LTC1343
5
39
D1
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
C2
1µF
C4
3.3µF
16
R4
26
20
CTRL
DCE 21
22
LATCH
M2 19
11 INVERT
18
M1
25 423SET
17
M0
R1
100k
40 GND LB
VCC
24
EC
23
C9
1µF
VCC 1 VCC
2 VDD
3
D1
4
D2
28
VEE 27
GND
26
25
24
23
5
D3
3 8 11 12 13
LTC1344A
14
VCC
C13
1µF
21
LATCH
2 VEE
C12
1µF
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
C11
1µF
4 RTS A CTS A
19 RTS B
20
DTR A
23
DTR B
CTS B
DSR A
DSR B
DTE_DCD/DCE_DCD
DTE_DSR/DCE_DTR
DTE_CTS/DCE_RTS
DTE_RL/DCE_RL
DCE/DTE
M2
M1
M0
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
1544 F25
Figure 25. Controller-Selectable Multiprotocol DTE/DCE Port with RL, LL, TM and DB-25 Connector
18
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