Analog DevicesLT1785CS8#PBFBus Line Transceivers

The LT1785CS8#PBF are Half-Duplex and Full-Duplex bus transceivers that are designed to work with the RS485 and RS422 bus specifications. The high-input impedance allows for up to 128 nodes and the LT1785CS8#PBF is capable of driving low cost low impedance cables. The LT1785 incorporates multiple protection circuits, including no damage or latch-up to ESD, short-circuit protection on all outputs, thermal shutdown protection, and is capable of withstanding voltage faults up to ±60 V. The LT1785 is also capable of data rates of 250 kbaud with 128 nodes, has guaranteed operation to 125°C, and has controlled slew rates for controlling EMI. The LT1785 also integrates a fail-safe whereby receiver inputs are assumed to be high for shorted, open, or inactive data lines. 

Drawings / Package

 Key Features

• Data rate of up to 250 kbaud with 128 nodes

• No damage or latch-up in ESD scenarios

• Controlled slew rates

• Guaranteed operation to 125°C

• Overvoltage protection up to ±60 V

• Can drive cable impedances as low as 72 Ω

General Applications

• Industrial Control Data Networks

• CAN Bus Applications

• HVAC Controls

Evaluation Board

The LT1785 can be evaluated with the EVAL-RS485HDEBZ .