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LTC1337CSW

5V Low Power RS232 3-Driver/5-Receiver Transceiver

Linear Technology 

LTC1337

5V Low Power RS232

3-Driver/5-Receiver Transceiver

FEATURES

■ Low Supply Current: 300µA

■ ESD Protection: Over ±10kV

■ 1µA Supply Current in Shutdown

■ Operates from a Single 5V Supply

■ Uses Small Capacitors: 0.1µF

■ Operates to 120k Baud

■ Three-State Outputs Are High Impedance When Off

■ Output Overvoltage Does Not Force Current Back into

Supplies

■ RS232 I/O Lines Can Be Forced to ±25V without

Damage

■ Pin Compatible with LT®1137A and LT1237

■ Flowthrough Architecture

U

APPLICATIO S

■ Notebook Computers

■ Palmtop Computers

DESCRIPTIO

The LTC®1337 is a 3-driver/ 5-receiver RS232 transceiver

with very low supply current. In the no load condition, the

supply current is only 300µA. The charge pump only

requires four 0.1µF capacitors and can supply up to 12mA

of extra current to power external circuitry.

In Shutdown mode, the supply current is further reduced

to 1µA. All RS232 outputs assume a high impedance state

in Shutdown and with the power off.

The LTC1337 is fully compliant with all data rate and

overvoltage RS232 specifications. The transceiver can

operate up to 120k baud with a 1000pF// 3kΩ load. Both

driver outputs and receiver inputs can be forced to ±25V

without damage, and can survive multiple ±10kV ESD

strikes.

, LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATIO

C1

0.1µF

3-Drivers/5-Receivers with Shutdown

V+ 1

VCC 2

3

C2

0.1µF

4

DRIVER 1 OUT 5

RX1 IN 6

DRIVER 2 OUT 7

8

RX2 IN

RX3 IN 9

10

RX4 IN

11

DRIVER 3 OUT

12

RX5 IN

13

ON/OFF

14

LTC1337

28 V–

27

26

C3

0.1µF

25

DRIVER 1 IN

24

RX1 OUT

23

DRIVER 2 IN

22

RX2 OUT

21

RX3 OUT

20

RX4 OUT

19

DRIVER 3 IN

18

RX5 OUT

17

GND

16

15

C4

0.1µF

1337 TA01

Supply Current

600

1.2

500

1.0

400

0.8

QUIESCENT

CURRENT

300

0.6

200

0.4

SHUTDOWN

CURRENT

100

0.2

0

– 20

0 20 40 60

TEMPERATURE (°C)

TEST CONDITION:

VCC = 5V, ALL DRIVER INPUTS TIED TO VCC

0

80

1337 TA02

1337fa

1

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