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LT1785A

Features: Protected from Overvoltage Line Faults to ±60VPin Compatible with LTC485 and LTC491High Input Impedance Supports Up to 128 NodesNo Damage or Latchup to ESD IEC-1000-4-2 Level 4: ±15kV Air Discharge IEC-1000-4-2 Level 2: ±4kV Contact DischargeControlled Slew Rates for EMI Emissions Contro...

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LT1785A: Features: Protected from Overvoltage Line Faults to ±60VPin Compatible with LTC485 and LTC491High Input Impedance Supports Up to 128 NodesNo Damage or Latchup to ESD IEC-1000-4-2 Level 4: ±15kV Air ...

LT1785A Data Sheet

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Part Number:
LT1785A
Supply Ability:
5000

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  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/11/23

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Product Details

Description



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
 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


Application

 Industrial Control Data Networks
 CAN Bus Applications
 HVAC Controls


Pinout

Connection Diagram


Specifications

Supply Voltage (VCC) ........................................................................... 18V
Receiver Enable Input Voltage ............................................... 0.3V to 6V
Driver Enable Input Voltage ................................................... 0.3V to 6V
Driver Input Voltage .............................................................. 0.3V to 18V
Receiver Input Voltage .......................................................... 60V to 60V
Driver Output Voltage ............................................................ 60V to 60V
Receiver Output Voltage ............................................ 0.3V to (VCC + 6V)
Operating Temperature Range
  LT1785C/LT1791C/ LT1785AC/LT1791AC ............................. 0°C to 70°C
  LT1785I/LT1791I/ LT1785AI/LT1791AI ............................. 40°C to 85°C
Storage Temperature Range ............................................ 65°C to 150°C
Lead Temperature (Soldering, 10 sec)............................................. 300°C


Description

The LT®1785/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 72W characteristic impedance.

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 eliminates need for external protection devices.

The LT1785/LT1785A are available in 8-lead DIP and SO packages and the LT1791/LT1791A in 14-lead DIP and SO packages.




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