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LT1785

更新时间： 2024-11-24 22:51:47
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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LT1785 数据手册

 浏览型号LT1785的Datasheet PDF文件第2页浏览型号LT1785的Datasheet PDF文件第3页浏览型号LT1785的Datasheet PDF文件第4页浏览型号LT1785的Datasheet PDF文件第5页浏览型号LT1785的Datasheet PDF文件第6页浏览型号LT1785的Datasheet PDF文件第7页 
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.  
■
■
■
■
U
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.  
U
TYPICAL APPLICATIO  
Normal Operation Waveforms at 250kBaud  
V
CC1  
RO1  
RX  
RE1  
DE1  
R
TERM  
LT1785  
RO  
DI1  
TX  
GND1  
Y-Z  
V
CC2  
RO2  
RX  
RE2  
DE2  
DI  
R
TERM  
LT1785  
DI2  
TX  
1785/91 TA02  
GND2  
1785/91 TA01  
1
1234567...12

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