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LTC1338

5V Low Power RS232

5-Driver/3-Receiver Transceiver

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FEATURE

DESCRIPTIO

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Low Supply Current: 500

µA

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0.2

µA Supply Current in SHUTDOWN

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50

µA Supply Current in RECEIVER ALIVE Mode

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ESD Protection Over

±10kV

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Operates from a Single 5V Supply

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Uses Small Capacitors: 0.1

µF

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Operates to 120k Baud

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Three-State Outputs Are High Impedance When Off

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Output Overvoltage Does Not Force Current

Back into Supplies

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RS232 I/O Lines Can Be Forced to

±25V

Without Damage

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Flowthrough Architecture

The LTC1338 is a 5-driver/ 3-receiver RS232 trans-

ceiver with very low supply current. In the no load

condition, the supply current is only 500

µA. The charge

pump only requires four 0.1

µF capacitors.

In SHUTDOWN mode, the supply current is further

reduced to 0.2

µA. In RECEIVER ALIVE mode, all three

receivers are kept alive and the supply current is 50

µA.

All RS232 outputs assume a high impedance state in

SHUTDOWN and with the power off.

The LTC1338 is fully compliant with all data rate and

overvoltage RS232 specifications. The transceiver can

operate up to 120k baud with a 2500pF, 3k

Ω 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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APPLICATI

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Battery-Powered Modems

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Battery-Powered DCE

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Notebook Computers

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Palmtop Computers

APPLICATI

TYPICAL

5-Drivers/3-Receivers with SHUTDOWN

LTC1338 • TA01

C1

0.1

µF

LTC1338

1

2

3

4

5

6

7

8

9

10

11

12

13

14

DRIVER 1 OUT

DRIVER 2 OUT

RX1 IN

DRIVER 3 OUT

RX2 IN

DRIVER 4 OUT

RX3 IN

DRIVER 5 OUT

RX ENABLE

NC

28

27

26

25

24

23

22

21

20

19

18

17

16

15

C3

0.1

µF

DRIVER 1 IN

DRIVER 2 IN

RX1 OUT

DRIVER 3 IN

RX2 OUT

DRIVER 4 IN

RX3 OUT

DRIVER 5 IN

GND

DRIVER ENABLE

NC

C2

0.1

µF

C4

0.1

µF

TEMPERATURE (°C)

1200

1000

800

600

400

200

0

20

40

60

LTC1338 • TA02

80

0

–20

1.2

1.0

0.8

0.6

0.4

0.2

0

QUIESCENT

CURRENT

SHUTDOWN

CURRENT

–40

TEST CONDITION:

100

Supply Current