IL485W
Isolated RS485 Interface With Handshake
Functional Diagram
Features
•
•
•
•
•
•
•
•
•
•
•
•
DE
D
R
RE
OUT
1
ISODE
A
B
IN
1
IL485W
V
ID
(A–B)
≥
200 mV
≤−200
mV
−7<V
I
<12
≥
1.5 V
≤−1.5
V
Open
DE
L
L
X
H
H
L
RE
L
L
H
L
L
ISODE
L
L
X
H
H
R
H
L
Z
H
L
D
X
X
X
H
L
Mode
Receive
Receive
Receive/Drive
Drive
Drive
2500 V
RMS
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
Thermal Shutdown Protection
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
UL1577 and IEC 61010-2001 Approval
Applications
•
Profibus/RS485 Systems
•
Multiple Data Point Transmission
Description
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.
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.
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.
L
L
H
X
Indeterminate
H = High Level, L = Low Level
X = Irrelevant, Z = High Impedance
OUT1
L
H
Z
RE
L
L
H
IN1
L
H
X
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
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