Linear Technology introduced the LTC2876 and LTC2877, exceptionally rugged, high-voltage tolerant RS-485 transceivers targeted for Profibus-DP (decentralised periphery) master and slave devices.
As with any fieldbus, Profibus-DP systems are prone to installation cross-wiring faults, ground voltage faults or surge, which can cause catastrophic over-voltage conditions that exceed the absolute maximum ratings of typical transceivers. Whether transmitting, receiving, in standby or powered off, the LTC2876 and LTC2877 tolerate ±60 V on their bus pins, eliminating common damage due to transmission line faults.
The devices provide multiple levels of protection that make them suitable for a variety of applications, including discrete manufacturing and process automation. An extended ±25 V input common-mode range and full failsafe operation improve data communications reliability in electrically noisy environments and in the presence of ground loop voltages, which would otherwise cause data errors and possible device damage.
Their incredibly high ESD protection guarantees the LTC2876 and LTC2877 can withstand ±52 kV HBM on the transceiver pins without latchup or damage; all other pins are protected to ±15 kV HBM. Fully symmetric receiver thresholds ensure the devices maintain good duty cycle symmetry at low signal levels and boost receiver noise immunity, while supporting full failsafe operation. Both devices are tested with Profibus IEC 61158-2 and TIA/EIA-485-A (RS-485) loads to ensure compatibility with both standards.
The ICs are offered in commercial, industrial and automotive versions, supporting operating temperature ranges of 0°C to 70°C, -40°C to 85°C, and -40°C to 125°C, respectively. The LTC2876 is available in a RoHS compliant 8-pin 3 x 3 mm DFN or MSOP package, while the LTC2877 includes a logic supply and is available in a RoHS compliant 10-pin 3 x 3 mm DFN or MSOP package.
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