Datasheet > LT1785A

LT1785A

更新时间： 2024-02-20 16:34:44

品牌	Logo	应用领域
凌特 - Linear		/
页数	文件大小	规格书
12页	199K
描述
60V Fault Protected RS485/RS422 Transceivers

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中文翻译

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数据手册

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LT1785A 数据手册

LT1785/LT1785A

LT1791/LT1791A

60V Fault Protected

RS485/RS422 Transceivers

FEATURES

DESCRIPTIO

The LT^®1785/LT1791 are half-duplex and full-duplex dif-

ferential bus transceivers for RS485 and RS422 applica-

tions which feature on-chip protection from overvoltage

faults on the data transmission lines. Receiver input and

driver output pins can withstand voltage faults up to ±60V

with respect to ground with no damage to the device.

Faultsmayoccurwhilethetransceiverisactive,shutdown

or powered off.

■

Protected from Overvoltage Line Faults to

60V

■

Pin Compatible with LTC485 and LTC491

■

High Input Impedance Supports Up to 128 Nodes

No Damage or Latchup to ESD

■

IEC-1000-4-2 Level 4: ±15kV Air Discharge

IEC-1000-4-2 Level 2: ±4kV Contact Discharge

Controlled Slew Rates for EMI Emissions Control

Guaranteed High Receiver Output State for Floating,

Shorted or Inactive Inputs

Outputs Assume a High Impedance When Off or

Powered Down

Drives Low Cost, Low Impedance Cables

Short-Circuit Protection on All Outputs

Thermal Shutdown Protection

■

Dataratesto250kbaudonnetworksofupto128nodesare

supported. Controlled slew rates on the driver outputs

control EMI emissions and improve data transmission

integrityonimproperlyterminatedlines.Driversarespeci-

fied to operate with inexpensive cables as low as 72Ω

characteristic impedance.

■

APPLICATIO S

The LT1785A/LT1791A devices have “fail-safe” receiver

inputs to guarantee a receiver output high for shorted,

open or inactive data lines. On-chip ESD protection elimi-

nates need for external protection devices.

■

Industrial Control Data Networks

■

CAN Bus Applications

■

HVAC Controls

The LT1785/LT1785A are available in 8-lead DIP and SO

packagesand theLT1791/LT1791Ain14-leadDIPandSO

packages.

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

TYPICAL APPLICATIO

Normal Operation Waveforms at 250kBaud

CC1

RO1

RE1

DE1

TERM

LT1785

DI1

GND1

Y-Z

CC2

RO2

RE2

DE2

TERM

LT1785

DI2

1785/91 TA02

GND2

1785/91 TA01

12 3 4 5 6 7...12

中文翻译

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