Features
Meets or Exceeds TIA/EIA RS-485 Requirements
1/8 Unit Load – Up to 256 Nodes on a Bus
Signaling Rates up to 1 Mbps
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
Safety and Regulatory Approvals
– 4000-V PK VIOTM, 560-VPK VIORM per DIN V VDE
V 0884-10 (VDE V 0884-10):2006-12 and DIN
EN 61010-1
– 2500 VRMS Isolation Rating per UL 1577
– 2500 VRMS Isolation Rating per CSA CA5A and
IEC 60950-1

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

Description
The ISO15 is an isolated half-duplex differential line
transceiver while the ISO35 is an isolated full-duplex differential line driver and receiver for TIA/EIA
485/422 applications. The ISO15M and ISO35M have
extended ambient temperature ratings of –55°C to
125°C while the ISO15 and ISO35 are specified over –40°C to 85°C.
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 barrier of the device is tested to provide
isolatlion of 4000 VPK per VDE and 2500 VRMS per UL
and CSA 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.