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±60V Fault Protected Full-/Half-Duplex 3V to 5.5V RS485 Transceivers Achieve 20Mbps
MILPITAS, CA – December 21, 2011 – Linear Technology Corporation
introduces the LTC2862-2865, a family of exceptionally 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
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
(HBM and
IEC-1000-4-2 air discharge) 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. For more information, visit www.linear.com/product/LTC2862.
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Summary of Features: LTC2862-65
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±60V Fault Protected RS485 Transceiver with |
