High speed RS-422 isolated transceiver

The IL3522E high speed differential input RS-422 isolated transceiver from NVE is designed to galvanically isolate bidirectional data communication over balanced transmission lines. The IL3522 series delivers at least 2.3V into a 54Ω load for excellent data integrity over long cables, and is also compatible with 3V input supplies, allowing interfacing to standard microcontrollers without additional level shifting. A unique ceramic/polymer composite barrier provides excellent isolation and virtually unlimited barrier life. This particular device uses NVE’s patented IsoLoop spintronic Giant Magnetoresistance (GMR) technology and comes in a 0.3″ 16-pin SOIC package.

• Surface-mount high speed, galvanically isolated RS-422 transceiver
• Power supply V_DD1 between 3V and 5.5V, V_DD2 between 4.5V and 5.5V
• Data rate as high as 40Mbps
• 15kV bus ESD protection
• Isolation voltage of 2.5kV_RMS
• Working voltage of 600V_RMS
• Temperature range of −40°C to +85°C
• Typical common mode transiend immunity of 50kV/μs (30kV/μs typical)
• Propagation delay of 20ns
• Thermal shutdown protection
• UL 1577 recognised; VDE V 0884-10 certified
• 0.3″ 16-pin SOIC package

The IL3522 has current limiting and thermal shutdown features to protect against output short circuits and bus contentions that may cause excessive power dissipation, and also incorporate a “fail-safe if open” design, ensuring a logic high on R if the bus lines are disconnected or “floating.”

Typical applications for the IL3522 series include:

• Factory automation
• Industrial control networks
• Building environmental controls
• Equipment covered under IEC 61010-1 Edition 3
• 5kV_RMS rated IEC 60601-1 medical applications

The below table gives the recommended operating conditions for the NVE IL3522 High speed RS-422 isolated transceiver series including the IL3522E: