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LT1341

5V RS232 Transceiver with One

Receiver Active in Shutdown

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FEATURE

The LT

receiver RS232 transceiver. Included on the chip is a

shutdown pin for reducing supply current to near zero.

During shutdown one receiver remains active to detect

incoming RS232 signals, for example, to wake up a

system. All other receivers and the drivers assume high

impedance states during shutdown.

The driver disable function provides additional control of

operating mode. When driver disable is high the charge

pump and drivers turn off. Receivers continue to operate

during driver disable.

New ESD structures on the chip allow the LT1341 to

survive multiple

±10kV strikes, eliminating the need for

costly TransZorbs

The LT1341 is fully compliant with all EIA RS232 specifi-

cations and operates in excess of 120kbaud even driving

heavy capacitive loads.

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One Receiver Remains Active While in Shutdown

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ESD Protection Over

±10kV

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Uses Small Capacitors: 0.1

µF, 0.2µF

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60

µA Supply Current in Shutdown

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Pin Compatible with LT1137A

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CMOS Comparable Low Power: 60mW

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Operates from a Single 5V Supply

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Easy PC Layout: Flowthrough Architecture

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Rugged Bipolar Design

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Outputs Assume a High Impedance State When

Off or Powered Down

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Absolutely No Latchup

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Available in SSOP Package

DESCRIPTIO

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

TransZorb is a registered trademark of General Instruments, GSI

Output Waveforms

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LT1341 • TA02

RECEIVER

OUTPUT

DRIVER

OUTPUT

INPUT

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

DRIVER 1 IN

RX1 OUT

DRIVER 2 IN

RX2 OUT

RX3 OUT

RX4 OUT

DRIVER 3 IN

0.1

µF

2

× 0.1µF

2

× 0.1µF

0.1

µF

GND

DRIVER DISABLE

TO LINE

TO LOGIC

LT1341 • TA01

RX5 OUT (LOW-Q)

RING DETECT IN

µCONTROLLER

OR

µPROCESSOR

SHUTDOWN

CONTROL OUT

LT1341

NC

DRIVER 1 OUT

RX1 IN

DRIVER 2 OUT

RX2 IN

RX3 IN

RX4 IN

DRIVER 3 OUT

RX5 IN (LOW-Q)

ON/OFF

NC

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Notebook Computers

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Palmtop Computers

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APPLICATI

APPLICATI

TYPICAL