High speed passive input RS-485 isolated transceiver

The IL3485-3E high speed passive input RS-485 isolated transceiver from NVE is designed to galvanically isolate bidirectional data communication over balanced transmission lines. The IL3485 series delivers at least 1.5V 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 0.15″ 16-pin SOIC package.

• Surface-mount high speed passive input RS-485 isolated transceiver
• Power supply V_DD1 between 3V and 5V, V_DD2 between 4.5V and 5V
• Data rate of 20Mbps
• Bus ESD protection of 15kV
• Isolation of 2,500 V_RMS (1 minute)
• Temperature range of −40°C to +85°C
• Typical common mode rejection 20kV/μs
• No carrier or clock for low EMI emissions and susceptibility
• Thermal shutdown protection
• Propagation delay of 50ns (5V)
• Coil resistance of 85Ω
• UL 1577 recognised; IEC 60747-5-5 (VDE 0884) certified
• 0.15″ 16-pin SOIC package

The IL3485 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 IL3485 series include:

• Data loggers
• P.O.S. systems
• Security networks
• Building environmental controls
• Industrial control networks
• Factory automation

The below table gives the recommended operating conditions for the NVE IL3485 high speed passive input RS-485 differential bus transceiver series including the IL3485-3E: