LT1381C Datasheet

IC型號(hào)：
LT1381C
PDF描述：
Linear Technology [Low Power 5V RS232 Dual Driver/Receiver ...
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LT1381

Low Power 5V RS232 Dual

Driver/Receiver with

0.1碌F Capacitors

FEATURES

DESCRIPTIO

ESD Protection over

鹵10kV

Low Cost

Uses Small Capacitors: 0.1碌F

CMOS Comparable Low Power: 40mW

Operates from a Single 5V Supply

120kBaud Operation for R

= 3k, C

= 2500pF

250kBaud Operation for R

= 3k, C

= 1000pF

Rugged Bipolar Design

Outputs Assume a High Impedance State When

Powered Down

Absolutely No Latchup

Available in Narrow SO Package

APPLICATI

The LT

廬

1381 is a dual RS232 driver/receiver pair with

integral charge pump to generate RS232 voltage levels

from a single 5V supply. The circuit features rugged

bipolar design to provide operating fault tolerance and

ESD protection unmatched by competing CMOS designs.

Using only 0.1碌F external capacitors, the circuit con-

sumes only 40mW of power and can operate to 120kbaud

even while driving heavy capacitive loads. New ESD struc-

tures on the chip allow the LT1381 to survive multiple

鹵10kV

strikes, eliminating the need for costly TransZorbs

廬

on the RS232 line pins. Driver outputs are protected from

overload and can be shorted to ground or up to

鹵25V

without damage. During power-off conditions, driver and

receiver outputs are in a high impedance state, allowing

line sharing.

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

TransZorb

廬

is a registered trademark of General Instruments, GSI

Portable Computers

Battery-Powered Systems

Power Supply Generator

Terminals

Modems

TYPICAL APPLICATI

0.1碌F

LT1381

5V INPUT

0.1碌F

OUT

DRIVER

OUTPUT

= 3k

= 2500pF

0.1碌F

鈥?/div>

OUT

RS232 OUTPUT

LOGIC

INPUTS

RECEIVER

OUTPUT

= 50pF

RS232 OUTPUT

RS232 INPUT

INPUT

LOGIC

OUTPUTS

RS232 INPUT

LT1381 鈥?TA01

Output Waveforms

LT1381 鈥?TA02

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