IsoLoop ® is a registered trademark of NVE Corporation.  REV. Q
Fractional Load Passive Input RS-485 and RS-422 Isolated Transceivers
Functional Diagrams
R RE
A
B
Z R RE
Y
IL3222IL3285
A B
V COIL2V COIL1V COIL1
V COIL2
DE
D
DE
D
IL3222 Driver
DE D V (Y-Z)
L X Z
H H ≥ 200 mV
H L ≤−200 mV
Features
• 3 V to 5 V power supplies
• 5 Mbps data rate • ⅛ unit load
• 15 kV bus ESD protection
• 2,500 V RMS  isolation (1 minute)
• 20 kV/µs typical common mode rejection
• No carrier or clock for low EMI emissions and susceptibility
• −40°C to +85°C temperature range
• Thermal shutdown protection
• UL 1577 recognized; IEC 60747-5-5 (VDE 0884) certified • 0.15", 0.3", or True 8™ mm 16-pin SOIC packages
Applications
• High node-count networks
• Security networks • Building environmental controls • Industrial control networks
• Gaming systems
Description
The IL3285 and IL3222 are galvanically isolated, differential bus transceivers designed for bidirectional data communication over balanced transmission lines. The devices use NVE’s patented* IsoLoop spintronic Giant
Magnetoresistance (GMR) technology. The IL3285 delivers
at least 1.5 V into a 54 Ω load, and the IL3222 at least 2 V into a 100 Ω load for excellent data integrity over long cables. These devices are also compatible with 3.3 V input supplies, allowing interface to standard microcontrollers
without additional level shifting.  A unique ceramic/polymer composite barrier provides
excellent isolation and virtually unlimited barrier life.  Both the IL3285 and IL3222 have current limiting and thermal shutdown features to protect against output short circuits and bus contentions that may ca
use excessive power dissipation. The receivers also incorporate a “fail-safe if open” design, ensuring a logic high on R if the bus lines are disconnected or “floating.”  Receiver input resistance of 96 k Ω is eight times the RS-485
“Unit Load” (UL) minimum of 12 k Ω. Thus these products
are known as “one-eighth UL” transceivers. There can be up to 256 on a network while still complying with the RS-485 loading specification. Selection Table Model Full/Half Duplex No. of Devices Allowed on Bus Data Rate Mbps Fail-Safe IL3285 half 256    5 yes IL3222 full 256    5 yes
Absolute Maximum Ratings
Operating at absolute maximum ratings will not damage the device. However, extended periods of operation at the absolute maximum ratings may affect performance and reliability.
Parameters  Symbol Min. Typ. Max. Units Test Conditions Storage Temperature T S  −55  150 °C  Ambient Operating Temperature T A  −40  85 °C  Voltage Range at A or B Bus Pins  −7  12 V
Supply Voltage (1)
V DD 1, V DD 2 −0.5  7 V  Digital Input Voltage  −0.5  V DD +0.5 V  Digital Output Voltage  −0.5  V DD +1 V  ESD Protection  ±15  kV  Input Current I IN −25  +25 mA  ESD (all bus nodes)  15  kV HBM
Recommended Operating Conditions
Parameters  Symbol Min. Typ. Max. Units Test Conditions
Supply Voltage
V DD 1 V DD 2    3.0 4.5    5.5
5.5 V
Ambient Operating Temperature T A  −40  85 °C
Input Voltage at any Bus Terminal (separately or common mode) V I
V IC    12 −7 V
Input Threshold for Output Logic High
I INH  1.5 0.8 mA
Input Threshold for Output Logic Low I INL  5 3.5  mA  Differential Input Voltage
V ID    +12/−7 V  High-Level Output Current (Driver) I OH  −60  60 mA  High-Level Digital Output Current (Receiver)
I OH  −8  8 mA  Low-Level Output Current (Driver) I OL  −60  60 mA  Low-Level Digital Output Current (Receiver)
I OL
−8
8
mA
Ambient Operating Temperature T A  −40  85 °C
Digital Input Signal Rise, Fall Times t IR ,t IF      1 μs
Insulation Specifications
Parameters  Symbol Min. Typ. Max. Units Test Conditions
Comparative Tracking Index  CTI ≥175  V Per IEC 60112
Endurance Voltage (Maximum Working Voltage for Indefinite Life) AC
DC V IO  1000  1500  V RMS
V DC
At maximum
operating temperature
Creepage Distance (external) 0.15" SOIC 0.3" SOIC    4.03 8.03  8.3  mm
Per IEC 60601 Total Barrier Thickness (internal)  0.012 0.013  mm
Barrier Resistance R IO  >1014
Ω 500 V Barrier Capacitance C IO  7  pF    f = 1 MHz Leakage Current  0.2  μA 240 V RMS , 60 Hz
Safety Approvals
IEC 60747-5-5 (VDE 0884) (File Number 5016933-4880-0001)
•Working V oltage (V IORM) 600 V RMS (848 V PK); basic insulation; pollution degree 2
•Transient overvoltage (V IOTM) and surge voltage (V IOSM) 4000 V PK
•Each part tested at 1590 V PK for 1 second, 5 pC partial discharge limit
•Samples tested at 4000 V PK for 60 sec.; then 1358 V PK for 10 sec. with 5 pC partial discharge limit
IEC 61010-1(Edition 2; TUV Certificate Numbers N1502812; N1502812-101)
Reinforced Insulation; Pollution Degree II; Material Group III
Part No. Suffix Package Working Voltage
计算机硬件V RMS
150
-
3 SOIC
None Wide-body SOIC/True 8™ 300 V RMS
UL 1577(Component Recognition Program File Number E207481)
Each part tested at 3000 V RMS (4240 V PK) for 1 second; each lot sample tested at 2500 V RMS (3530 V PK) for 1 minute
Soldering Profile
Per JEDEC J-STD-020C, MSL 1
Electrostatic Discharge Sensitivity
This product has been tested for electrostatic sensitivity to the limits stated in the specifications. However, NVE recommends that all integrated circuits be handled with appropriate care to avoid damage. Damage caused by inappropriate handling or storage could range from performance degradation to complete failure.
IL3285-3 Pin Connections (0.15" SOIC Package)
V DD1V COIL2GND 1
V COIL1
GND 2R NC RE B DE A D V DD2NC NC
GND 2
IL3222-3 Pin Connections (0.15" SOIC Package)
V DD1V COIL2GND 1
V COIL1
GND 2R A RE B DE Z D V DD2Y NC
GND 2
IL3285 Pin Connections (0.3" SOIC Package)
V DD1V COIL2GND 1
V COIL1
GND 2R NC RE B DE A D V DD2NC GND 1
GND 2
IL3222 Pin Connections (0.3" SOIC Package)
V DD1V COIL2GND 1
V COIL1
GND 2R A RE B DE Z D V DD2Y GND 1
GND 2