LT1330 datasheet(1/10 Pages) LINER

Part #	LT1330

Description	5V RS232 Transceiver with 3V Logic Interface and One Receiver Active in Shutdown

PDF	10 Pages

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LT1330

1

1330fb

TYPICAL APPLICATION

DESCRIPTION

5V RS232 Transceiver with

3V Logic Interface and One

Receiver Active in Shutdown

The LT®1330 is a three driver, ﬁve receiver RS232 trans-

ceiver with low supply current. Designed to interface

with new 3V logic, the LT1330 operates with both a 5V

power supply and a 3V logic power supply. The chip may

be shut down to micropower operation with one receiver

remaining active to monitor RS232 inputs such as ring

detect from a modem.

The LT1330 is fully compliant with all EIA RS232 spec-

iﬁcations. Additionally, the RS232 line input and output pins

are resilient to multiple ±10kV ESD strikes. This eliminates

the need for costly TransZorbs® on line pins for the RS232

part.

The LT1330 operates to 120kbaud even driving high

capacitive loads. During shutdown, driver and receiver

outputs are at a high impedance state allowing devices to

be paralleled.

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

TransZorb is a registered trademark of General Instrments, GSI.

FEATURES

APPLICATIONS

n 3V Logic Interface

n ESD Protection over ±10kV

n Uses Small Capacitors: 0.1μF, 0.2μF, 1.0μF

n One Low Power Receiver Remains Active While in

Shutdown

n Pin Compatible with LT1137A and LT1237

n 120kBaud Operation for RL = 3k, CL = 2500pF

n 250kBaud Operation for RL = 3k, CL = 1000pF

n CMOS Comparable Low Power: 30mW

n Easy PC Layout—Flowthrough Architecture

n Rugged Bipolar Design

n Outputs Assume a High Impedance State When Off

or Powered Down

n Absolutely No Latchup

n 60μA Supply Current in Shutdown

n Available in SO and SSOP Packages

n Notebook Computers

n Palmtop Computers

1330 TA01

5V VCC

1.0μF

2

0.1μF

TO

LINE

LT1330

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 (LOW-Q)

ON/OFF

3V VL

28

27

26

25

24

23

22

21

20

19

18

17

16

15

2

0.1μF

DRIVER 1 IN

RX1 OUT

DRIVER 2 IN

RX2 OUT

RX3 OUT

RX4 OUT

DRIVER 3 IN

RX5 OUT (LOW-Q)

GND

DRIVER

DISABLE

RING DETECT IN

SHUTDOWN

CONTROL OUT

μCONTROLLER OR

μPROCESSOR

TO LOGIC

V–

V+

1330 TA02

Output Waveforms

RECEIVER

OUTPUT

VL = 3V

CL = 50pF

DRIVER

OUTPUT

RL = 3k

CL = 2500pF

INPUT

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