1 Features
• Meets or exceeds TIA/EIA-485-A
• Signaling rate up to 20 Mbps
• 1/8 unit load – up to 256 nodes on a bus
• Thermal shutdown protection
• Typical efficiency > 60% (ILOAD = 100 mA) - see
SLUU469
• Low bus capacitance 7 pF (typical)
• 50-kV/μs typical transient immunity
• Fail-safe receiver for bus open, short, idle
• 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
– 4242 VPK basic insulation per DIN EN IEC
60747-17 (VDE 0884-17)
– 2500 VRMS isolation for 1 minute per UL 1577
– CSA component acceptance notice 5A, IEC
60950-1 and IEC 61010-1 standards

2 Applications
• Isolated RS-485/RS-422 Interfaces
• Factory automation
• Motor/motion control
• HVAC and building automation networks
• Networked security stations

3 Description
The ISO3086T is an isolated differential line
transceiver with integrated oscillator outputs that
provide the primary voltage for an isolation
transformer. The device is a full-duplex differential line
transceiver for RS-485 and RS-422 applications that
can easily be configured for half-duplex operation by
connecting pin 11 to pin 14, and pin 12 to pin 13.
These devices are ideal for long transmission lines
since 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 4242
VPK of isolation for 1 minute per VDE 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 near-by 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 ISO3086T is specified for use from –40°C to
85°C.