LTC1344ACG#TRPBF Datasheet LTC1344AIG#PBF, LTC1344ACG#PBF, LTC1344ACG#TRPBF | P10-P12

10

LTC1344A

TYPICAL APPLICATIONS N

U

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

V

CC

V

DD

NC

V

CC

V

EE

GND

2

V

CC

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

1µF

C1

1µF

C5

1µF

C3

1µF

C4

3.3µF

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

16109764

3 8 11 12 13

5

2

15 18 17 19 20 22

LTC1344A

C6

100pF

C7

100pF

C8

100pF

V

CC

V

CC

5V

23 24

14

1

DCE/DTE

M2

M1

M0

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

1610

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

V

EE

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

1µF

C11

1µF

C10

1µF

C9, 1µF

C13

1µF

11

LTC1344A

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

PACKAGE DESCRIPTION

U

Dimensions in inches (millimeters) unless otherwise noted.

G Package

24-Lead Plastic SSOP (0.209)

(LTC DWG # 05-08-1640)

G24 SSOP 0595

0.005 – 0.009

(0.13 – 0.22)

0

° – 8°

0.022 – 0.037

(0.55 – 0.95)

0.205 – 0.212**

(5.20 – 5.38)

0.301 – 0.311

(7.65 – 7.90)

1234

5

6

7

8 9 10 11 12

0.318 – 0.328*

(8.07 – 8.33)

2122 18 17 16 15 14

13

19202324

0.068 – 0.078

(1.73 – 1.99)

0.002 – 0.008

(0.05 – 0.21)

0.0256

(0.65)

BSC

0.010 – 0.015

(0.25 – 0.38)

DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH

SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD

FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE

*

**

12

LTC1344A

 LINEAR TECHNOLOGY CORPORATION 1998

1344af, sn1344a LT/TP 0898 4K • PRINTED IN USA

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900

●

FAX: (408) 434-0507

●

www.linear-tech.com

Figure 13 shows a typical application for the LTC1344A

using the LTC1543 mixed mode transceiver chip to gener-

ate the clock and data signals for a serial interface. The

LTC1344A V

EE

supply is generated from the LTC1543

charge pump and the select lines M0, M1, M2 and

RELATED PARTS

PART NUMBER DESCRIPTION COMMENTS

LTC1334 Single Supply RS232/RS485 Transceiver 2 RS485 Dr/Rx or 4 RS232 Dr/Rx Pairs

LTC1343 Multiprotocol Serial Transceiver Software Selectable Mulitprotocol Interface

LTC1345 Single Supply V.35 Transceiver 3 Dr/3 Rx for Data and CLK Signals

LTC1346A Dual Supply V.35 Transceiver 3 Dr/3 Rx for Data and CLK Signals

LTC1543 Multiprotocol Serial Transceiver Software-Selectable Transceiver for Data and CLK Signals

LTC1544 Multiprotocol Serial Transceiver Software-Selectable Transceiver for Control Signals

DCE/DTE are shared by both chips. Each driver output and

receiver input is connected to one of the LTC1344A

termination ports. Each electrical protocol can then be

chosen using the digital select lines.

TYPICAL APPLICATIO

U

Figure 13. Typical Application Using the LTC1344A

LTC1543

24

1344 F13

426

5

6

7

8

9

10

23

22

21

20

19

18

17

16

15

M0

M1

M2

DCE/DTE

11

12

13

14

LTC1344A

14

21

22

23

24

1

2

5

3

8

11

12 13

4

6

7

9

10

16

15

18

17

19

20

DTE DCE

TXD

+

RXD

+

TXD

–

RXD

–

RXD

+

TXD

+

RXD

–

TXD

–

SCTE

+

RXC

+

SCTE

–

RXC

–

TXC

+

TXC

+

RXC

+

SCTE

+

RXC

–

SCTE

–

TXC

–

TXC

–

V

CC

V

EE

M2

M1

M0

C2

3.3µF

C1

1µF

100pF

LATCH

DCE/DTE

M2

M1

M0

DCE/DTE

LTC1344ACG#TRPBF

LTC1344ACG#TRPBF

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