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Transceivers simplify RS485 networks

Posted: 14 Mar 2006 ?? ?Print Version ?Bookmark and Share

Keywords:LTC2859? LTC2861? transceivers? RS485 networks? Linear Technology?

Linear Technology Corp. introduced the LTC2859 and LTC2861 half-duplex and full-duplex RS485 transceivers with switchable, integrated termination. Traditional RS485 networks require 120-ohm termination resistors to be installed by the end user based on the physical layout of the twisted-pair wires and the placement of the nodes. As the bus is extended, the termination must be changed again by the end user. Switching the integrated termination in the transceivers on or off under software control is said to allow the proper nodes to be terminated without the end user's physical intervention.

The products suit industrial, medical and automotive applications. A slew rate control pin allows data rates up to 20Mbps or a low-EMI mode at 250Kbps. The bus pin protection exceeds 15kV for ESD strikes (Human Body Model). The receiver input impedance allows up to 256 nodes on a single bus. Linear claims that these features provide more functionality than existing RS485 transceivers, and the integrated termination combined with the DFN package provide a smaller solution overall.

Specified over the commercial and industrial temperature ranges, the LTC2859 is offered in the 10-lead (3-by-3mm) DFN package and the LTC2861 is offered in the 12-lead (4-by-3mm) DFN and 16-lead SSOP packages. Pricing begins at $1.55 each in 1,000-piece quantities.

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Related Datasheets
Part Number Description Category
? LTC2859 20Mbps RS485 Transceiver with Integrated Switchable Termination EDA - Embedded Systems Design
? LTC2861 20Mbps RS485 Transceivers with Integrated Switchable Termination EDA - Embedded Systems Design



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