Linear has transceiver that is reliable in the field




Description

The LTC®2862/LTC2863/LTC2864/LTC2865 are low power, 20Mbps or 250kbps RS485/RS422 transceivers operating on 3V to 5.5V supplies that feature ±60V overvoltage fault protection on the data transmission lines during all modes of operation, including power-down. Low EMI slew rate limited data transmission is available in a logic-selectable 250kbps mode in the LTC2865 and in 250kbps versions of the LTC2862-LTC2864. Enhanced ESD protection allows these parts to withstand ±15kV HBM on the transceiver interface pins without latchup or damage.

Extended ±25V input common mode range and full failsafe operation improve data communication reliability in electrically noisy environments and in the presence of large ground loop voltages.

Features

  • Protected from Overvoltage Line Faults to ±60V
  • 3V to 5.5V Supply Voltage
  • 20Mbps or Low EMI 250kbps Data Rate
  • ±15kV ESD Interface Pins, ±8kV All Other Pins
  • Extended Common Mode Range: ±25V
  • Guaranteed Failsafe Receiver Operation
  • High Input Impedance Supports 256 Nodes
  • 1.65V to 5.5V Logic Supply Pin (VL) for Flexible Digital Interface (LTC2865)
  • H-Grade Option Available (–40°C to 125°C)
  • Fully Balanced Differential Receiver Thresholds for Low Duty Cycle Distortion
  • Current Limited Drivers and Thermal Shutdown
  • Pin Compatible with LT1785 and LT1791
  • Available in DFN and Leaded Packages

Linear has RS485-422 transceiver that is reliable in the field

Applications

  • Supervisory Control and Data Acquisition (SCADA)
  • Industrial Control and Instrumentation Networks
  • Automotive and Transportation Electronics
  • Building Automation, Security Systems and HVAC
  • Medical Equipment
  • Lighting and Sound System Control

Linear Technology has a range of rugged, high voltage tolerant RS485/RS422 transceivers which it says can eliminate field failures without the need of costly external protection devices.

In practical RS485 systems, installation cross-wiring faults, ground voltage faults or lightning induced surge voltages can cause overvoltage conditions that exceed absolute maximum ratings of typical transceivers.

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The LTC2862-2865 feature ±60V overvoltage fault protection on the data transmission lines, protecting bus pins during operation and power shutdown. Whether a circuit is transmitting, receiving, in standby or powered off, the LTC2862-2865 tolerate any voltage within ±60V without damage, increasing the robustness of any typical RS485 network.

The low power family supports fast 20Mbit/s and low-EMI slew-rate-limited 250kbit/s data rates, as well as half- and full-duplex versions.

The LTC2862-2865 family provides protection and reliability for a variety of RS485/RS422 applications, including industrial control, instrumentation networks and automotive electronics.

An extended ±25V input common-mode range and full failsafe operation improve data communications reliability in electrically noisy environments and in the presence of ground loop voltages. This extended common-mode range allows the LTC2862-2865 devices to transmit and receive under harsh conditions that would otherwise cause data errors and possible device damage.

Enhanced ESD protection allows these devices to withstand ±15kV (HBM and IEC-1000-4-2 air discharge) on the transceiver pins without latchup or damage; all other pins are protected to ±8kV HBM. Fully symmetric receiver thresholds allow the devices to maintain good duty cycle symmetry at low signal levels and boost receiver noise immunity.

 

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