21

LTC2846

sn2846 2846fs

Figure 33. Controller-Selectable Multiprotocol DTE/DCE Port with DB-25 Connector

TYPICAL APPLICATIO S

D2

D1

LTC2844

D3

R2

R1

R4

R3

LTC2846

M0

M1

M2

DCE/DTE

GND

2846 F33

C2

1

µF

R1

13k

C1

1

µF

C6

10

µF

C3

1

µF

C4

3.3

µF

D4

5V

SHDN

3.3V

CHARGE

PUMP

BOOST

SWITCHING

REGULATOR

L1

5.6

µH

33

7

35

4

36

D1

MBR0520

3

5

6

8

9

10

11

12

13

14

15

16

18

19

1

2

3

4

5

6

7

8

10

9

DCE/DTE

15

3.3V

16

17

18

19

20

21

22

23

24

25

32

31

30

29

28

27

26

25

24

23

22

21

20

26

27

28

C5

10

µF

C9

1

µF

C7

1

µF

C8

1

µF

M0

M1

M2

DCE/DTE

M0

M1

M2

11

12

13

14

D1

D2

D3

R1

R2

R3

T

T

T

T

T

C10

1

µF

R2

4.3k

5V

DTE_TXD/DCE_RXD

DTE_SCTE/DCE_RXC

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_LL

2

14

24

11

15

12

17

9

3

1

4

19

20

8

23

10

6

22

5

13

18

7

16

SCTE B

RTS A

RTS B

DTR A

DTR B

CTS A

CTS B

DSR A

DSR B

CTS A

CTS B

LL A

SG

SHIELD

DB-25

CONNECTOR

DCD A

DCD B

DSR A

DSR B

RTS A

RTS B

LL A

DCD A

DCD B

DTR A

DTR B

TXD A

TXD B

TXC A

RXC A

RXD A

TXC B

RXC B

RXD B

TXC A

SCTE A

TXD A

TXC B

SCTE B

TXD B

SCTE A

RXC B

RXD A

DTE

DCE

RXD B

RXC A

3.3V