±60V Fault Tolerant RS485/RS422 Transceiver with Operation to 175°C

The LTC2879X is a rugged RS485/RS422 transceiver designed to operate over a wide temperature range of –55°C to 175°C. Special processing steps are used to prevent intermetallic growth that can cause metal voids on standard parts operating at high temperatures. Lowdrift, low-leakage circuitry and lack of a thermal shutdown circuit allow the LTC2879X to meet critical specifications, tested 100% at 175°C.

The LTC2879X also meets the specifications for PROFIBUS-DP (IEC 61158-2) supporting all data rates from 9.6kbps to 12Mbps.

The LTC2879X is exceptionally robust, tolerating ±60V faults on the bus pins and protected to ±52kV ESD. These devices are suitable for harsh environments or where 24V power might be inadvertently connected. Extended ±25V input common mode operating range and full failsafe operation improve data communication reliability in noisy systems.

The LTC2879X meets RS485, RS422, and PROFIBUS-DP specifications with a supply voltage of 4.5V to 5.5V with full RS485/RS422 compatibility down to 3V.

Applications

* Oil and Gas Exploration

* High Temperature Industrial Control

* PROFIBUS-DP

* Military Systems

* Harsh Environments

* Guaranteed Operation from –55°C to 175°C

* Fully Tested at 175°C

* Protected from Overvoltage Line Faults to ±60V

* ±52kV ESD Interface Pins, ±15kV All Other Pins

* Level 4 IEC61000-4-4 Electrical Fast Transient

* ±25V Working Common Mode Range

* 20Mbps Maximum Baud Rate