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 EN IEC 60747-17 (VDE 0884-17)
– 2500 VRMS isolation per UL 1577
– 4000 VPK isolation per CSA 62368-1

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 fullduplex
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 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.