10

LTC1344A

Cable Selectable Multiprotocol DTE/DCE Port with DB-25 Connector

D2

D1

LTC1544

D3

R2

R1

R4

R3

D2

LTC1543

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_SCTE/DCE_RXC

M0

M1

M2

DCE/DTE

NC

NC

GND

2

14

24

11

15

12

17

9

3

1

25

21

18

4

19

20

8

23

10

6

22

5

13

7

16

1344A TA05

D3

R2

R1

R3

D1

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

DCE/DTE

M1

M0

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

D4

16

10

9

7

6

4

3

8

11

12

13

5

2

15 18 17 19 20 22

LTC1344A

C6

100pF

C7

100pF

C8

100pF

5V

23 24

14

1

CHARGE

PUMP

28

3

1

2

4

5

6

7

8

9

10

11

12

13

14

1

2

3

4

5

6

7

8

9

INVERT

15

16

10

17

18

19

20

21

22

23

24

25

NC

27

26

25

24

23

22

21

20

19

18

17

16

15

26

27

28

M0

M1

M2

DCE/DTE

11

12

13

14

DTE

DCE

MODE

PIN 18

PIN 21

V.35

PIN 7

PIN 7

RS449, V.36

NC

PIN 7

RS232

PIN 7

NC

CABLE WIRING FOR MODE SELECTION

MODE

PIN 25

DTE

PIN 7

DCE

NC

CABLE WIRING FOR

DTE/DCE SELECTION

LATCH

21

C12

1

µF

C11

1

µF

C10

1

µF

C9, 1

µF

C13

1

µF