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1kV RS-485 transceiver has highest working voltage

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By Nick Flaherty

The higher working voltage and reinforced isolation of the ISL32741E is required for today’s most rigorous medical and high-speed motor control applications and operate up to 40Mbit/s. The ISL32740E with 2.5kV of isolation and 600VRMS working voltage comes in the industry’s smallest package, enabling high channel density for programmable logic controllers (PLCs) in factory automation applications.

The transceivers use giant magnetoresistance (GMR) technology to provide additional advantages over other isolation technologies, including ultra-low radiated emission and EMI susceptibility, support for up to 160 devices on the bus, and an extended 125°C temperature range. This provides galvanic isolation to keep the communication bus free from common-mode noise generated in electrically noisy factory and building automation environments. The GMR isolation does not require the elaborate encoding schemes found in capacitive and transformer-based isolators that use RF carriers or pulse-width modulation (PWM) to transfer DC and low frequency signals across the barrier.

The transceivers are aimed at equipment-to-bus interfaces in PROFIBUS DP and high-speed RS-485 networks that connect PLCs to instruments, robots, motor control drives, as well as data acquisition and digital I/O modules. In addition to not requiring any shielding, these transceivers simplify PCB layout, use less board space, and enhance data transmission reliability and integrity. The ISL3274xE devices also offer low power consumption so that the ISL32740EIAZ can operate with a 60mA supply current in a 4mm x 5mm QSOP package at maximum speed without overheating. Thermal shutdown protection prevents damage during bus contention, or excessive current.

On the non-isolated control-side, the ISL3274xE transceivers support direct connection to a 3V microcontroller (MCU) while the isolated bus-side connects to a higher voltage 5V supply for communication of strong bus signals across 100 meters and longer distances. The ISL3274xE transceivers are fully compliant with the EN 50081 and EN 50082-2 electromagnetic compatibility (EMC) standards and the umbrella line-voltage standard for information technology equipment (ITE) EN 61000. Between the two sides, the pulse skew is 5ns and the propagation delay is 20ns.

“Our latest high-speed RS-485 isolated transceivers radiate virtually no EMI, and they eliminate ground loops between bus nodes to protect data transmission,” said Philip Chesley, vice president of Industrial Analog and Power products at Intersil. “The ISL32741E’s high working voltage and ability to push its reinforced isolation barrier up to 6kV enables customers to solve their most difficult IIoT networking design problems.

The ISL3274xE can be combined with the ISL28025 precision digital power monitor, ISL12022M low power real time clock, and Renesas MCUs to create a system solution and the parts are rated with a barrier lifetime of 44,000 years

The ISL32740E and ISL32741E 40Mbps RS-485 transceivers are available now with prices ranging from USD$3.79 to USD$4.79 depending on package type and temperature range. Evaluation boards are available for $99 USD.

www.intersil.com/products/isl32741e
 


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