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Renesas introduces 5V RS-485/422 transceiver family

Renesas has introduced the RAA78815x family of 5V differential RS-485/422 transceivers with electrical fast transient (EFT) immunity – ±5000V – and ESD protection of up to ±16,000V.

The six new full and half duplex ruggedized devices meet both the RS-485 and RS-422 communication standards and are suited for a variety of industrial network, process control network, building automation, long-haul network, and security camera network applications.

These devices build on Renesas’ current ISL315x 5V RS-485 transceiver family with additional immunity for EFT. In addition to the industry’s highest EFT immunity, the RAA78815x family delivers exceptional differential output voltages, featuring 3.1V into the RS-485-required 54Ω load.

The new high-speed transceivers also feature bus leakage currents of maximum 125 μA, representing a true 1/8 unit load to the RS-485 bus.

Developers can connect up to 512 transceivers on the same bus without using repeaters and without compromising the RS-485 network standard’s 32-unit load maximum.

As a result of these changes, the RAA78815x family can lower implementation and downtime costs, since a single network can support more nodes with lower likelihood of communications issues due to ESD and EFT overvoltage transients.

Author
Neil Tyler

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