Linear Technology Introduced the LTC2862-2865

Published:2012/1/3 2:07:00 Author:Phyllis From:SeekIC

Linear Technology Corporation introduces the LTC2862-2865, a family of exceptionally rugged, high voltage tolerant RS485/RS422 transceivers which 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. 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 20Mbps and low-EMI slew-rate-limited 250kbps data rates, as well as half- and full-duplex versions.

The LTC2862-2865 family provides valuable protection and reliability for a wide 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 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.
The LTC2862-2865 family is offered in commercial, industrial and automotive temperature grades and available in DFN and SO packages with industry-standard pinouts. Pricing starts at $2.35 each for the 20Mbps half-duplex versions in 1,000 piece quantities. These devices provide a pin-compatible upgrade path from Linear’s half-duplex LT1785 and full-duplex LT1791, 250kbps ±60V fault protected transceivers.

Linear Technology Corporation designs, manufactures, and markets various analog integrated circuits worldwide. The company produces power management, data conversion, signal conditioning, RF and interface ICs, and µModule subsystems. Its products comprise amplifiers, high speed amplifiers, voltage regulators, voltage references, interface, data converters, radio frequency circuits, power over Ethernet controllers, µModule power products, and single chain µModule products, as well as other liner circuits. The company’s product applications include telecommunications, cellular telephones, networking products, tablet, notebook, and desktop computers; computer peripherals, video/multimedia, industrial instrumentation, and security monitoring devices; consumer products, such as digital cameras and global positioning systems; complex medical devices, automotive electronics, factory automation, and process control; and military, space, and other harsh environment systems. It sells its products primarily through its direct sales staff and through electronics distributors.

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