18

LTC1546

Figure 32. Controller-Selectable Multiprotocol DTE/DCE Port with RL, LL, TM and DB-25 Connector

10

17

18

D2

D1

LTC1545

D3

R2

R1

R3

GND

D4

1,19

2,20

3

4

5

6

7

8

9

R4EN

D4ENB

15

16

NC

24

23

22

25

26

27

28

29

30

31

32

33

34

35

36

M0

M1

M2

DCE/DTE

M0

M1

M2

DCE/DTE

11

12

13

14

D5

21

R4

R5

18

*

*OPTIONAL

21

25

LL

LL

RL

RL

TM

TM

RI

RI

LTC1546

DTE_TXD/DCE_RXD

DTE_TXC/DCE_TXC

DTE_RXC/DCE_SCTE

DTE_RXD/DCE_TXD

DTE_RTS/DCE_CTS

DTE_DTR/DCE_DSR

DTE_DCD/DCE_DCD

DTE_DSR/DCE_DTR

DTE_CTS/DCE_RTS

DTE_LL/DCE_RI

DTE_RI/DCE_LL

DTE_TM/DCE_RL

DTE_RL/DCE_TM

DTE_SCTE/DCE_RXC

M0

M1

M2

DCE/DTE

5V

2

14

24

11

15

12

17

9

3

1

4

19

20

8

23

10

6

22

5

13

7

16

1546 F32

C2

1

µF

C1

1

µF

C5

1

µF

C3

1

µF

C4

3.3

µF

TXD A

TXD B

SCTE A

SCTE B

RXD A

RXD B

RXC A

RXC B

RXC A

RXC B

RXD A

RXD B

RTS A

RTS B

DTR A

DTR B

CTS A

CTS B

DSR A

DSR B

CTS A

CTS B

SG

SHIELD

DB-25

CONNECTOR

TXC A

TXC B

SCTE A

SCTE B

TXD A

TXD B

TXC A

TXC B

DCD A

DCD B

DSR A

DSR B

RTS A

RTS B

DCD A

DCD B

DTR A

DTR B

5V

CHARGE

PUMP

28

3

1

2

4

5

6

7

8

9

10

11

12

13

14

27

26

25

24

23

22

21

20

19

18

17

16

15

DTE

DCE

C11

1

µF

C10

1

µF

C9

1

µF

T

T

T

T

T

D1

D2

D3

R1

R2

R3

TYPICAL APPLICATIO S