RS485 transceivers need no termination resistors

12 July 2006 Analogue, Mixed Signal, LSI

Linear Technology has introduced the LTC2859 and LTC2861, half-duplex and full-duplex RS485 transceivers with switchable, integrated termination.

Traditional RS485 networks require 120 Ω 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 LTC2859/LTC2861 on, or off, under software control allows the proper nodes to be terminated without the end-user's physical intervention.

In addition to the innovative termination capacity, the LTC2859/61 offer advanced transceiver features for industrial, medical and automotive applications. A slew rate control pin allows datarates up to 20 Mbps or a low-EMI mode at 250 Kbps. The bus pin protection exceeds ±15 kV for ESD strikes (human body model). The receiver input impedance allows up to 256 nodes on a single bus.

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