IL3285 IL3222
Isoloop® is a registered trademark of NVE Corporation.
*U.S. Patent number 5,831,426; 6,300,617 and others.
ISB-DS-001-IL612-A, January 20, 2005
NVE Corp., 11409 Valley View Road, Eden Prairie, MN 55344-3617, U.S.A.
Telephone: 952-829-9217, Fax 952-829-9189, www.isoloop.com
© 2005 NVE Corporation
Fractional Load RS485 and RS422 Transceivers
Functional Diagram
Truth Table
.
VID (A-B)
DE
RE
R
D
Mode
= 200 mV
L
L
H
C
Receive
= -200 mV
L
L
L
X
Receive
-7<VID<12
X
H
Z
X
Receive/Drive
= 1.5 V
H
L
H
H
Drive
= -1.5 V
H
L
L
L
Drive
Selection Table.
Model
Half / Full
Duplex
No. of devices
allowed on bus
Data Rate
Mb/s
Fail-safe
IL3285
half
256
1
yes
IL3222
full
256
1
yes
Features
•
3.3 V Input Supply Compatible
•
2500 VRMS Isolation (1 min)
•
40 ns Propagation Delay
•
5 ns Pulse Skew
•
20 kV/µs Transient Immunity
•
Thermal Shutdown Protection
•
-40°C to +85°C Temperature Range
•
16 Pin SOIC Package
•
UL1577 Approval Pending
•
IEC 61010-1 Approval Pending
•
+15 kV ESD Protection
Applications
•
High Node Count Networks
•
Security Networks
•
Building Environmental Controls
•
Industrial Control Networks
•
Gaming Systems
•
Factory Automation
Description
The IL3000 series are galvanically isolated, differential bus
transceivers designed for bidirectional data communication on
balanced transmission lines. Isolation is achieved through
patented* Isoloop® technology. The IL3285 and IL3222 offer
an exceptional 2.3 V differential output into a 54
Ω load,
which allows better data integrity over longer cable lengths.
These devices are also compatible with 3.3 V input supplies,
allowing interface to standard microcontrollers without the
need for additional level-shifting components.
The IL3000 series have current limiting and thermal shutdown
features to protect against output short circuits and bus
contention situations which may cause excessive power
dissipation. The receivers also incorporate a “sail-safe if
open” design which ensures a logic high on R if the bus lines
are disconnected or “floating”.
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