Overview
The ISO3086T, specifically the ISO3086TDWR model, is a 20-Mbps, full-duplex, 2.5-kVrms isolated RS-485 and RS-422 transceiver produced by Texas Instruments. This device is designed to provide high-speed data transmission with robust isolation, making it ideal for applications requiring reliable communication over long distances. The ISO3086T features integrated oscillator outputs that supply the primary voltage for an isolation transformer, enhancing the isolation barrier between the bus-line transceiver and the logic-level interface. This isolation significantly increases protection against electrical noise transients and reduces the risk of damage to sensitive control circuits. The device operates within a temperature range of –40°C to 85°C, ensuring reliability in various environmental conditions.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Operating Temperature Range | -40 | 85 | °C | |
| Signaling Rate | 20 | Mbps | ||
| Logic-side Supply Voltage (3.3V operation) | 3.3 | 3.6 | 3.6 | V |
| Logic-side Supply Voltage (5V operation) | 4.5 | 5 | 5.5 | V |
| Bus-side Supply Voltage | 4.5 | 5 | 5.5 | V |
| Differential Load Resistance | 54 | 60 | Ω | |
| Output Current, Driver | -60 | 60 | mA | |
| Output Current, Receiver | -8 | 8 | mA | |
| Maximum Transient Isolation Voltage | 4242 | VPK | ||
| Maximum Repetitive Peak Isolation Voltage | 566 | VPK | ||
| Package Type | SOIC (DW) 16 pins |
Key Features
- Meets or exceeds TIA/EIA-485-A standards
- Signaling rate up to 20 Mbps
- 1/8 unit load – supports up to 256 nodes on a bus
- Thermal shutdown protection
- Typical efficiency > 60% (I LOAD = 100 mA)
- Low bus capacitance of 7 pF (typical)
- 50-kV/µs typical transient immunity
- Fail-safe receiver for bus open, short, idle conditions
- Logic inputs are 5 V tolerant
- Bus-pin ESD protection
- 11-kV HBM between bus-pins and GND2, 6-kV HBM between bus-pins and GND1
- Safety and regulatory approvals including CSA, IEC 60950-1, IEC 61010-1, and UL 1577
Applications
The ISO3086T is ideal for various applications requiring reliable and isolated communication over long distances. These include:
- Industrial automation and control systems
- Networked security stations
- Building automation systems
- Remote monitoring and control systems
- Any application requiring high-speed, isolated RS-485 or RS-422 communication
Q & A
- What is the maximum signaling rate of the ISO3086T?
The ISO3086T supports a signaling rate up to 20 Mbps.
- What is the operating temperature range of the ISO3086T?
The device operates within a temperature range of –40°C to 85°C.
- How many nodes can be supported on a bus with the ISO3086T?
The ISO3086T supports up to 256 nodes on a bus due to its 1/8 unit load.
- What is the typical transient immunity of the ISO3086T?
The device has a typical transient immunity of 50-kV/µs.
- Does the ISO3086T have built-in thermal protection?
- What is the maximum transient isolation voltage of the ISO3086T?
The device has a maximum transient isolation voltage of 4242 VPK.
- Is the ISO3086T compliant with industry standards?
- How can the ISO3086T be configured for half-duplex operation?
The device can be configured for half-duplex operation by connecting pin 11 to pin 14 and pin 12 to pin 13.
- What is the package type of the ISO3086TDWR?
The ISO3086TDWR comes in a SOIC (DW) package with 16 pins.
- Are the logic inputs of the ISO3086T 5 V tolerant?
- What is the typical efficiency of the ISO3086T when loaded with 100 mA?
The typical efficiency of the ISO3086T is greater than 60% when loaded with 100 mA.
