IL485W
Isolated RS485 Interface With Handshake
Functional Diagram
Features
• 2500 VRMS Isolation (1 min.)
• 25 ns Maximum Propagation Delay
• 35 Mbps Data Rate
• 1 ns Pulse Skew (typ.)
• Designed for Multi-point Transmission
on Long Bus Lines in Noisy Environments
• ±60 mA Driver Output Capability
DE
D
ISODE
A
B
• Thermal Shutdown Protection
R
RE
• Meets or Exceeds ANSI RS-485 and ISO 8482:1987(E)
• −40°C to +85°C Temperature Range
• PROFIBUS International Component Recognition
• 16-Pin SOIC Package
IN1
OUT1
• UL1577 and IEC 61010-2001 Approval
IL485W
Applications
• Profibus/RS485 Systems
• Multiple Data Point Transmission
VID (A–B)
≥ 200 mV
≤−200 mV
−7<VI<12
≥ 1.5 V
DE
L
RE ISODE
R
H
L
D
X
X
X
H
L
Mode
L
L
H
L
L
L
L
L
Receive
Receive
Receive/Drive
Drive
L
Description
X
H
H
L
X
H
H
L
Z
The IL485W is a galvanically isolated, high-speed differential bus
transceiver, designed for bidirectional data communication on
balanced transmission lines. The devices use NVE’s patented*
IsoLoop spintronic Giant Magnetoresistance (GMR) technology. The
IL485W is the first isolated RS-485 interface in a standard 16-pin
SOIC package that meets the ANSI Standards EIA/TIA-422-B and
RS-485 and is compatible with 3.3V input supplies.
H
L
≤−1.5 V
Open
Drive
H
X
Indeterminate
H = High Level, L = Low Level
X = Irrelevant, Z = High Impedance
The IL485W has current limiting and thermal shutdown features to
protect against output short circuits and bus contention situations that
could cause excessive power dissipation.
RE
L
L
IN1
L
H
OUT1
L
H
Z
H
X
With 1 ns pulse skew and 16 ns propagation delay, the IL485W is
ideal for PROFIBUS applications.
DE/ISODE and IN1/OUT1 allow isolated RTSAS and DTSAS
handshaking.
Isoloop is a registered trademark of NVE Corporation.
*U.S. Patent number 5,831,426; 6,300,617 and others.
REV. N
NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 Fax: (952) 829-9189 www.IsoLoop.com
©2008 NVE Corporation