The LTC2862-2865 from Linear Technology is a family of rugged, high-voltage tolerant RS485/RS422 transceivers for elimination of 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 over-voltage conditions that exceed absolute maximum ratings of typical transceivers. The LTC2862-2865 feature ±60 V over-voltage 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 devices tolerate any voltage within ±60 V without damage, increasing the robustness of any typical RS485 network.
The low-power family supports 20 Mbps and low-EMI, slew-rate-limited 250 Kbps data rates, as well as half- and full-duplex versions. The LTC2862-2865 provides valuable protection and reliability for a wide variety of RS485/RS422 applications, including industrial control, instrumentation networks and automotive electronics.
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. This extended common-mode range allows the 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 ±15 kV (HBM and IEC-1000-4-2 air discharge) on the transceiver pins without latch-up or damage; all other pins are protected to ±8 kV HBM. Fully symmetrical receiver thresholds allow the devices to maintain good duty cycle symmetry at low signal levels and boost receiver noise immunity.
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