1 Features

• Meets or Exceeds TIA/EIA RS-485 Requirements
• Signaling Rates up to 20 Mbps
• 1/8 Unit Load – Up to 256 Nodes on a Bus
• Thermal Shutdown Protection
• Low Bus Capacitance – 16 pF (Typical)
• 50 kV/μs Typical Transient Immunity
• Fail-safe Receiver for Bus Open, Short, Idle
• 3.3-V Inputs are 5-V Tolerant
• Bus-Pin ESD Protection
  • 12-kV HBM Between Bus Pins and GND2
  • 6-kV HBM Between Bus Pins and GND1
• Safety-Related Certifications:
  • 4000-VPK Basic Insulation, 560 VPK VIORM per DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12 and DIN EN 61010-1
  • 2500 VRMS Isolation per UL 1577
  • 4000 VPK Isolation per CSA Component Acceptance Notice 5A and IEC 60950-1

2 Applications

• Security Systems
• Chemical Production
• Factory Automation
• Motor and Motion Control
• HVAC and Building Automation Networks
• Networked Security Stations

3 Description

The ISO3080 and ISO3086 devices are isolated full-duplex differential line drivers and receivers while the ISO3082 and ISO3088 devices are isolated half-duplex differential line transceivers for TIA/EIA 485/422 applications.

These devices are ideal for long transmission lines because the ground loop is broken to allow for a much larger common-mode voltage range. The symmetrical isolation barrier of the device is tested to provide 2500 VRMS of isolation for 60 s per UL 1577 between the bus-line transceiver and the logic-level interface.

Any cabled I/O can be subjected to electrical noise transients from various sources. These noise transients can cause damage to the transceiver and/or nearby sensitive circuitry if they are of sufficient magnitude and duration. These isolated devices can significantly increase protection and reduce the risk of damage to expensive control circuits.

The ISO3080, ISO3082, ISO3086, and ISO3088 device are qualified for use from –40°C to +85°C.

Device Information

1. For all available packages, see the orderable addendum at the end of the data sheet.

ISO3080, IOS3086 Function Diagram

ISO3082, IOS3088 Function Diagram