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LT1791A Datasheet

LT1791A Datasheet

60V Fault Protected RS485/RS422 Transceivers
Part No.: LT1791A
Page: 18 Pages
Size: 313 KB
Manufacturer: Linear Technology
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Views: 1
Update Time: 2023-10-24 17:06:40
DataSheet: Download

LT1791A Datasheet Applicable Part

Part No. Packing SPQ Marking MSL Pins Temp Range Package Description Buy
LT1791ACN#PBF Tube 25 1791A 1 14 0°C ~ 70°C 14-Lead PDIP  
LT1791ACN#TRPBF Reel   1791A 1 14 0°C ~ 70°C 14-Lead PDIP  
LT1791ACN#TRMPBF Reel   1791A 1 14 0°C ~ 70°C 14-Lead PDIP  
LT1791ACS#PBF Tube 55 1791A 1 14 0°C ~ 70°C 14-Lead Plastic SO  
LT1791ACS#TRPBF Reel 2500 1791A 1 14 0°C ~ 70°C 14-Lead Plastic SO  
LT1791ACS#TRMPBF Reel 500 1791A 1 14 0°C ~ 70°C 14-Lead Plastic SO  
LT1791AIN#PBF Tube 25 1791AI 1 14 -40°C ~ 85°C 14-Lead PDIP  
LT1791AIN#TRPBF Reel   1791AI 1 14 -40°C ~ 85°C 14-Lead PDIP  
LT1791AIN#TRMPBF Reel   1791AI 1 14 -40°C ~ 85°C 14-Lead PDIP  
LT1791AIS#PBF Tube 55 1791AI 1 14 -40°C ~ 85°C 14-Lead Plastic SO  
LT1791AIS#TRPBF Reel 2500 1791AI 1 14 -40°C ~ 85°C 14-Lead Plastic SO  
LT1791AIS#TRMPBF Reel 500 1791AI 1 14 -40°C ~ 85°C 14-Lead Plastic SO  
LT1791AHN#PBF Tube 25 1791AH 1 14 -40°C ~ 125°C 14-Lead PDIP  
LT1791AHN#TRPBF Reel   1791AH 1 14 -40°C ~ 125°C 14-Lead PDIP  
LT1791AHN#TRMPBF Reel   1791AH 1 14 -40°C ~ 125°C 14-Lead PDIP  
LT1791AHS#PBF Tube 55 1791AH 1 14 -40°C ~ 125°C 14-Lead Plastic SO  
LT1791AHS#TRPBF Reel 2500 1791AH 1 14 -40°C ~ 125°C 14-Lead Plastic SO  
LT1791AHS#TRMPBF Reel 500 1791AH 1 14 -40°C ~ 125°C 14-Lead Plastic SO  
SPQ:Standard Pack Quantity;MSL:Moisture Sensitivity Level

LT1791A Datasheet(PDF)

LT1791A Datasheet(Picture)

LT1791A Features

  • 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 (LT1791A)
  • 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
  • Guaranteed Operation to 125°C

LT1791A Applications

  • Industrial Control Data Networks
  • CAN Bus Applications
  • HVAC Controls

LT1791A Description

The LT1791 are half-duplex and full-duplex differential bus transceivers for RS485 and RS422 applications 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. Faults may occur while the transceiver is active, shut down or powered off.

Data rates to 250kbaud on networks of up to 128 nodes are supported. Controlled slew rates on the driver outputs control EMI emissions and improve data transmission integrity on improperly terminated lines. Drivers are specified to operate with inexpensive cables as low as 72Ω characteristic impedance.

The LT1791A devices have “fail-safe” receiver inputs to guarantee a receiver output high for shorted, open or inactive data lines. On-chip ESD protection eliminates need for external protection devices.

The LT1791A are available in 14-lead DIP and SO packages.

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