1

LTC1337

1337fa

5V Low Power RS232

3-Driver/5-Receiver Transceiver

■

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

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Pin Compatible with LT

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Flowthrough Architecture

The LTC

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.

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Notebook Computers

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Palmtop Computers

3-Drivers/5-Receivers with Shutdown

Supply Current

TEMPERATURE (°C)

600

500

400

300

200

100

0

20

40

60

1337 TA02

80

0

–20

1.2

1.0

0.8

0.6

0.4

0.2

0

QUIESCENT

CURRENT

SHUTDOWN

CURRENT

TEST CONDITION:

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

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

1337 TA01

C1

0.1µF

LTC1337

1

2

3

4

5

6

7

8

9

10

11

12

13

14

DRIVER 1 OUT

RX1 IN

DRIVER 2 OUT

RX2 IN

RX3 IN

RX4 IN

DRIVER 3 OUT

RX5 IN

ON/OFF

28

27

26

25

24

23

22

21

20

19

18

17

16

15

C3

0.1µF

DRIVER 1 IN

RX1 OUT

DRIVER 2 IN

RX2 OUT

RX3 OUT

RX4 OUT

DRIVER 3 IN

RX5 OUT

C2

0.1µF

C4

0.1µF

GND