IL422
Isoloop is a registered trademark of NVE Corporation.
*U.S. Patent number 5,831,426; 6,300,617 and others.
REV. Q
NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: ( 952) 829-9217 Fax: (952) 829-9189 www.IsoLoop.com ©NVE Corporation
Isolated RS422/RS485 Interface
Functional Diagram
ISODE
A
B
Z
DE
D
R
RE
Y
IL422
IL422 Receiver
RE R V
(
A−B
)
H Z X
L H ≥ 200 mV
L L ≤−200 mV
L I Open
IL422 Driver
DE D V
(
Y−Z
)
L X Z
H H ≥ 200 mV
H L ≤−200 mV
Features
• 3.3 V Input Supply Compatible
• 2500 Vrms Isolation (1 min.)
• 25 ns Maximum Propagation Delay
• 25 Mbps Data Rate
• 1 ns Pulse Skew (typ.)
• ±60 mA Driver Output Capability
• Thermal Shutdown Protection
• Meets or Exceeds ANSI 422-B, EIA 485-A and
ITU Recommended V11
• Low EMC Footprint
• −40°C to +85°C Temperature Range
• PROFIBUS International Component Recognition
• 16-pin SOIC Package
• UL1577 and IEC 61010-2001 Approved
Applications
Multi-point or multi-drop transmission on long bus lines in noisy
environments.
Description
The IL422 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
IL422 is the first isolated RS-422 interface in a standard 16-
p
in SOIC
package that meets the ANSI Standards EIA/TIA-422-B and RS-485
and is compatible with 3.3V input supplies.
The IL422 has current limiting and thermal shutdown features to
protect against output short circuits and bus contention situations that
could cause excessive power dissipation.
H = High Level, L = Low Level
I = Indeterminate, X = Irrelevant, Z = High Impedance
IL422
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NVE Corporation 11409 Valley View Road Eden Prairie, MN 55344-3617 USA Telephone: (952) 829-9217 Fax (952) 829-9189 Internet: www.isoloop.com
Absolute Maximum Ratings(11)
Parameters Symbol Min. Typ. Max. Units Test Conditions
Storage Temperature TS −65 150 °C
Ambient Operating Temperature TA −40 100 °C
Voltage Range at A or B Bus Pins −7 12 V
Supply Voltage
(
1
)
V
DD1, VDD2 −0.5 7 V
Digital Input Voltage −0.5 5.5 V
Digital Output Voltage −0.5 VDD + 1 V
Continuous Total Power Dissipation 725
377 mW 25°C
85°C
Maximum Output Current IO 95 mA
Lead Solder Temperature 260 °C 10 sec.
ESD 2 kV HBM
Recommended Operating Conditions
Parameters Symbol Min. Typ. Max. Units Test Conditions
Supply Voltage VDD1
VDD2 3.0
4.5 5.5
5.5 V
Input Voltage at any Bus Terminal
(separately or com mon mode) VI
VIC 12
−7 V
High-Level Digital Input Voltage VIH 2.4
3.0 VDD1 V
VDD1 = 3.3 V
VDD1 = 5.0 V
Low-Level Digital Input Voltage VIL 0 0.8 V
Differential Input Voltage
(
2
)
V
ID ±12 V
High-Level Output Current (Driver) IOH 60 mA
High-Level Digital Output Current
(Receiver) IOH 8 mA
Low-Level Output Current (Driver) IOL −60 mA
Low-Level Digital Output Current
(Receiver) IOL −8 mA
Ambient Operating Temperature TA −40 85 °C
Transient Immunity 20 kV/μs
Digital Input Signal
Rise and Fall Times tIR,tIF DC Stable
Insulation Specifications
Parameters Symbol Min. Typ. Max. Units Test Conditions
Creepage Distance 8.08 mm
Barrier Impedance >1014||7 Ω || pF
Leakage Current 0.2 μA 240 VRMS, 60 Hz
Safety and Approvals
IEC61010-1
TUV Certificate Numbers: N1502812, N1502812-101
Classification: Reinforc e d Insulation
Model Package Pollution Degree Material Group Max. Working Voltage
IL422 0.3" SOIC II III 300 VRMS
UL 1577
Component Recognition Pprogram File Number: E207481
Rated 2500VRMS for 1 minute
Soldering Profile
Per JEDEC J-STD-020C, MSL=2
IL422
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NVE Corporation 11409 Valley View Road Eden Prairie, MN 55344-3617 USA Telephone: (952) 829-9217 Fax (952) 829-9189 Internet: www.isoloop.com
IL422 Pin Connections
1 VDD1 Input Power Supply
2 GND1 Input Power Supply Ground Return*
3 R Output Data from Bus
4
RE Read Data Enable
(if RE is high, R = high impedance)
5 DE Drive Enable
6 D Data Input to Bus
7 NC No Internal Connection
8 GND1 Input Power Supply Ground Return*
9 GND2 Output Power Supply Ground Return*
10 ISODE
Isolated DE Output for use in Profibus
applications where the state of the isolated
drive enable node needs to be monitored
11 Y Y Bus (Drive – True)
12 Z Z Bus (Drive – Inverse)
13 B B Bus (Receive – Inverse)
14 A A Bus (Receive – True)
15 GND2 Output Power Supply Ground Return*
16 VDD2 Output Power Supply
VDD1VDD2
GND1
D
GND2
RA
RE B
DE Z
NC
Y
ISODE
GND1GND2
IL422
*NOTE: Pins 2 and 8 are internally connected, as are pins 9 and 15.
IL422
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NVE Corporation 11409 Valley View Road Eden Prairie, MN 55344-3617 USA Telephone: (952) 829-9217 Fax (952) 829-9189 Internet: www.isoloop.com
Driver Section
Electrical specifications are Tmin to Tmax and VDD = 4.5 V to 5.5 V unless otherwise stated.
Parameters Symbol Min. Typ.(5) Max. Units Test Conditions
Input Clamp Voltage VI
K
−1.5 V IL = −18 mA
Output voltage VO 0 6 V IO = 0
Differential Output Voltage
(
2
)
|VOD1| 1.5 6 V IO = 0
Differential Output Voltage
(
2
)
|VOD2| 1.5 2.5 5 V RL = 54 Ω, VDD = 5 V
Differential Output Voltage
(
2
)(
6
)
VOD3 1.5 5 V RL = 54 Ω, VDD = 4.5 V
Change in Magnitude of Differential
Output Voltage(7) Δ|VOD| ±0.2 V RL = 54 Ω or 100 Ω
Common Mode Output Voltage VOC
3
−1 V RL = 54 Ω or 100 Ω
Change in Magnitude of Common
Mode Output Voltage(7) Δ|VOC| ±0.2 V RL = 54 Ω or 100 Ω
Output Current(4) Output Disabled IO
1
−0.8 mA VO = 12 V
VO = −7 V
High Level Input Current IIH 10 μA VI = 3.5 V
Low Level Input Current IIL −10 μA VI = 0.4 V
Short-circuit Output Current IOS
250
−150
−250 mA VO = −6 V
VO = 0 V
VO = 8 V
Supply Current VDD1 = +5 V
VDD1 = +3.3 V IDD1
IDD1 4
3 6
3 mA No Load
(Outputs Enabled)
Switching Specifications
Parameters Symbol Min. Typ.(5) Max. Units Test Conditions
Maximum Data Rate 25 Mbps RL = 54 Ω, CL = 50 pF
Differential Output Prop Delay tD(OD) 16 25 ns RL = 54 Ω, CL = 50 pF
Pulse Skew
(
10
)
t
S(P) 1 6 ns RL = 54 Ω, CL = 50 pF
Differential Output Ri se & Fall Time tT(OD) 8 10 ns RL = 54 Ω, CL = 50 pF
Output Enable Time to High Level tPZH 31 65 ns RL = 54 Ω, CL = 50 pF
Output Enable Time to Low Level tPZL 22 35 ns RL = 54 Ω, CL = 50 pF
Output Disable Time from High Level tPHZ 28 50 ns RL = 54 Ω, CL = 50 pF
Output Disable Time from Low Level tPLZ 16 32 ns RL = 54 Ω, CL = 50 pF
Skew Limit
(
3
)
t
S
K
(LIM) 2 8 ns RL = 54 Ω, CL = 50 pF
Notes (apply to both driver and receiver sections):
1. All voltage values are with respect to ne twork ground except differential I/O bus voltages.
2. Differential input/output voltage is measured at the noninverting terminal A with respect to the inverting terminal B.
3. Skew limit is the maximum propagation delay difference between any two devices at 25°C.
4. The power-off measurement in ANSI Standard EIA/TIA-422-B applies to disabled outputs only and
is not applied to combined inputs and outputs.
5. All typical values are at VDD1,VDD2 = 5 V or VDD1= 3 .3 V and TA = 25°C.
6. The minimum VOD2 with a 100 Ω load is either ½ VOD1 or 2 V, whichever is greater.
7. Δ|VOD| and Δ|VOC| are the changes in magnitude of VOD and VOC, respectively,
that occur when the input is changed form one logic state to the other.
8. This applies for both power on and power off, refer to ANSI standard RS-485 for exact condition.
The EIA/TIA-422-B limit does not apply for a combined driver and receiver terminal.
9. Includes 8 ns read enable time. Maximum propagation delay is 25 ns after read assertion.
10. Pulse skew is defined as |tPLH − tPHL| of each channel.
11. The relevant test and measurement methods are given in the Electromagnetic Compatibility section on p. 6.
12. External magnetic field immunity is improved by this factor if the field direction is “end-to-end” rather than to “pin-to-pin” (see diagram on p. 6).
IL422
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NVE Corporation 11409 Valley View Road Eden Prairie, MN 55344-3617 USA Telephone: (952) 829-9217 Fax (952) 829-9189 Internet: www.isoloop.com
Receiver Section
Electrical specifications are Tmin to Tmax and VDD = 4.5 V to 5.5 V unless otherwise stated.
Parameters Symbol Min. Typ.(5) Max. Units Test Conditions
Positive-going Input
Threshold Voltage VIT+ 0.2 V
VO = 2.7 V,
IO = −0.4 mA
Negative-going Input
Threshold Voltage VIT- −0.2 V
VO = 0.5 V,
IO = 8 mA
Hysteresis Voltage (VIT+ − VIT-) VHYS 60 mV
High Level Digital Output Voltage VOH VDD − 0.2 V VID = 200 mV
IOH = −20 μA
Low Level Digital Output Voltage VOL 0.2 V
VID = −200 mV
IOH = 20 μA
High-impedance-state output current IOZ ±10 μA VO = 0.4 to (VDD2−0.5) V
Line Input Current(8) I
I
1
−0.8 mA VI = 12 V
VI = −7 V
Other Input(11) = 0 V
Input Resistance rI 12 20 kΩ
Supply Current IDD2 27 34 mA
No load
Outputs Enabled
Switching Characteristics at 5 V
Parameters Symbol Min. Typ.(5) Max. Units Test Conditions
Maximum Data Rate 25 Mbps RL = 54 Ω, CL = 50 pF
Propagation Delay(9) tPD 24 32 ns
VO = −1.5 V to 1.5 V,
CL = 15 pF
Pulse Skew(10) t
SK(P) 1 6 ns
VO = −1.5 V to 1.5 V,
CL = 15 pF
Skew Limit
(
3
)
t
S
K
(LIM) 2 8 ns RL = 54 Ω, CL = 50 pF
Output Enable Time To High Level tPZH 17 24 ns CL = 15 pF
Output Enable Time To Low Level tPZL 30 45 ns CL = 15 pF
Output Disable Time From High Level tPHZ 30 45 ns CL = 15 pF
Output Disable Time From Low Level tPLZ 18 27 ns CL = 15 pF
Switching Characteristics at 3.3 V
Parameters Symbol Min. Typ.(5) Max. Units Test Conditions
Maximum Data Rate 25 Mbps RL = 54 Ω, CL = 50 pF
Propagation Delay(9) tPD 27 32 ns
VO = −1.5 V to 1.5 V,
CL = 15 pF
Pulse Skew(10) t
SK(P) 2 6 ns
VO = −1.5 V to 1.5 V,
CL = 15 pF
Skew Limit
(
3
)
t
S
K
(LIM) 4 8 ns RL = 54 Ω, CL = 50 pF
Output Enable Time To High Level tPZH 20 24 ns CL = 15 pF
Output Enable Time To Low Level tPZL 33 45 ns CL = 15 pF
Output Disable Time From High Level tPHZ 33 45 ns CL = 15 pF
Output Disable Time From Low Level tPLZ 20 27 ns CL = 15 pF
Magnetic Field Immunity(11) Magnetic Field Immunity at 5 V
Power Frequency Magnetic Immunity HPF 2800 3500 A/m 50Hz/60Hz
Pulse Magnetic Field Immunity HPM 4000 4500 A/m t
= 8µs
Damped Oscillatory Magnetic Field HOSC 4000 4500 A/m 0.1Hz – 1MHz
Cross-axis Immunity Multiplier
(
12
)
K
X 2.5
Magnetic Field Immunity at 3.3 V
Power Frequency Magnetic Immunity HPF 1000 1500 A/m 50Hz/60Hz
Pulse Magnetic Field Immunity HPM 1800 2000 A/m t
= 8µs
Damped Oscillatory Magnetic Field HOSC 1800 2000 A/m 0.1Hz – 1MHz
Cross-axis Immunity Multiplier
(
12
)
K
X 2.5
IL422
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NVE Corporation 11409 Valley View Road Eden Prairie, MN 55344-3617 USA Telephone: (952) 829-9217 Fax (952) 829-9189 Internet: www.isoloop.com
Application Information
Electrostatic Discharge Sensitivity
This product has been tested for electrostatic sensitivity to the
limits stated in the specifications. However, NVE recommends that
all integrated circ uits be handled with appropriate care to avoid
damage. Damage caused by inappropriate ha ndling or storage could
range from performance degradation to complete failure.
Electromagnetic Compatibility
The IL422 is fully compliant with generic EMC standards
EN50081, EN50082-1 and the umbrella line-voltage standard for
Information Technology Equipment (ITE) EN61000. The IsoLoop
Isolator’s Wheatstone bridge configuration and differential
magnetic field signaling ensure excellent EMC performance against
all relevant standards. NVE conducted compliance tests in the
categories below:
EN50081-1
Residential, Commercial & Light Industrial
Methods EN55022, EN55014
EN50082-2: Industrial Environment
Methods EN61000-4-2 (ESD), EN61000-4-3 (Electromagnetic
Field Immunity), EN61000-4-4 (Electrical Transient Immunity),
EN61000-4-6 (RFI Immunity), EN61000-4-8 (Power Frequency
Magnetic Field Immunity), EN61000-4-9 (Pulsed Magnetic
Field), EN61000-4-10 (Damped Oscillatory Magnetic Field)
ENV50204
Radiated Field from Digital Telephones (Immunity Test)
Immunity to external magnetic fields is even higher if the field
direction is “end-to-end” rather than to “pin-to-pin” as shown in the
diagram below:
Cross-axis Field Direction
Dynamic Power Consumption
IsoLoop Isolators achieve their low power consumption from the
way they transmit data across the isolation barrier. By detecting the
edge transitions of the input logic signal and converting these to
narrow current pulses, a magnetic field is created around the GMR
Wheatstone bridge. Depending on the direction of the magnetic
field, the bridge causes the output comparator to switch following
the input logic signal. Since the current pulses are narrow, about
2.5 ns, the power consumption is independent of mark-to-space
ratio and solely dependent on frequency. This has obvious
advantages over optocouplers, which ha ve power consumption
heavily dependent on frequency and time.
The approximate power supply current per channel is:
IIN = 40 x f x 1 mA
Where f = operating frequency
fMAX = 50 MHz
Power Supply Decoupling
Low ESR capacitors such as ceramic are required to decouple the
supplies. Both VDD1 and VDD2 must be bypassed with 47 nF
capacitors. These should be placed as close as possible to VDD pins
for proper operation. Additionally, V DD2 should have a 10 µF
tantalum capacitor connected in parallel with the 47 nF capacitor.
fMAX 4
IL422
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NVE Corporation 11409 Valley View Road Eden Prairie, MN 55344-3617 USA Telephone: (952) 829-9217 Fax (952) 829-9189 Internet: www.isoloop.com
0.3" 16-pin SOIC Package
NOM
Pin 1 identified by
either an indent
or a marked dot
0.287 (7.29)
0.300 (7.62)
Dimensions in inches (mm)
0.08 (2.0)
0.10 (2.5)
0.092 (2.34)
0.105 (2.67)
0.397 (10.1)
0.413 (10.5)
0.013 (0.3)
0.020 (0.5)
0.394 (10.00)
0.419 (10.64)
0.040 (1.0)
0.060 (1.5) 0.004 (0.1)
0.012 (0.3)
0.007 (0.2)
0.013 (0.3) 0.016 (0.4)
0.050 (1.3)
Pin spacing is a BASIC
dimension; tolerances 
do not accumulate
NOTE:
Ordering Information and Valid Part Numbers
IL 422 E TR13
Bulk Packaging
Blank = Tube
TR = 13'' Tape and Reel
Package
Blank = 80/20 Tin/Lead Plating
E = RoHS Compliant
Base Part Number
422 = RS-422 Transceiver
Product Family
IL = Isolators
Valid Part Numbers
IL422
IL422E
All IL422
part types are
available on
tape and reel.
RoHS
COMPLIANT
IL422
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NVE Corporation 11409 Valley View Road Eden Prairie, MN 55344-3617 USA Telephone: (952) 829-9217 Fax (952) 829-9189 Internet: www.isoloop.com
ISB-DS-001-IL422-Q
February 2012 Changes
• Update terms and conditions.
ISB-DS-001-IL422-P Changes
• Added clarification of internal ground connections.
ISB-DS-001-IL422-O
Changes
• Added low EMC footprint.
ISB-DS-001-IL422-N Changes
• Added magnetic field immunity and electromagnetic compatibility specifications.
• Added note on package drawing that pin-spacing tolerances are non-accumulating.
ISB-DS-001-IL422-M
Changes
• Changed ordering information to reflect that devices are now fully RoHS compliant with
no exemptions.
ISB-DS-001-IL422-L
Changes
• Reorganized supply current specifications; misc. minor changes
ISB-DS-001-IL422-K
Changes
• Eliminated soldering profil e chart
ISB-DS-001-IL422-J
Changes
• Updated open input state in truth table
ISB-DS-001-IL422-I Changes
• Updated package drawing; misc.
ISB-DS-001-IL422-H
Changes
• Updated UL and IEC approvals
ISB-DS-001-IL422-G Changes
• Revision letter added.
• Ordering Information Removed.
• IEC 61010-1 Classification: “Reinforced Insulation” added.
• Notes added.
• IR Soldering Profile added
• Ordering Information added.
IL422
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NVE Corporation 11409 Valley View Road Eden Prairie, MN 55344-3617 USA Telephone: (952) 829-9217 Fax (952) 829-9189 Internet: www.isoloop.com
Datasheet Limitations
The information and data provided in datasheets shall define the specification of the product as agreed between NVE and its customer, unless NVE and
customer have explicitly agreed otherwise in writing. All specifications are based on NVE test protocols. In no event however, shall an agreement be
valid in which the NVE product is deemed to offer functions and qualities beyond those described in the datasheet.
Limited Warranty and Liability
Information in this document is believed to be accurate and reliable. However, NVE does not give any representations or warranties, expressed or
implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information.
In no event shall NVE be liable for any indirect, incidental, punitive, special or consequential damages (including, without limitation, lost profits, lost
savings, business interruption, costs related to the removal or replacement of any products or rework charges) whether or not such damages are based on
tort (including negligence), warranty, breach of contract or any other legal theory.
Right to Make Changes
NVE reserves the right to make changes to information published in this document including, without limitation, specifications and product descriptions
at any time and without notice. This document supersedes and replaces all information supplied prior to its publication.
Use in Life-Critical or Safety-Critical Applications
Unless NVE and a customer explicitly agree otherwise in writing, NVE products are not designed, authorized or warranted to be suitable for use in life
support, life-critical or safety-critical devices or equipment. NVE accepts no liability for inclusion or use of NVE products in such applications and such
inclusion or use is at the customer’s own risk. Should the customer use NVE products for such application whether authorized by NVE or not, the
customer shall indemnify and hold NVE harmless against all claims and damages.
Applications
Applications described in this datasheet are illustrative only. NVE makes no representation or warranty that such applications will be suitable for the
specified use without further testing or modification.
Customers are responsible for the design and operation of their applications and products using NVE products, and NVE accepts no liability for any
assistance with applications or customer product design. It is customer’s sole responsibility to determine whether the NVE prod uct is suitable and fit for
the customer’s applications and products planned, as well as for the planned application and use of customer’s third party customers. Customers should
provide appropriate design and operating safeguards to minimize the risks associated with their applications and products.
NVE does not accept any liability related to any default, damage, costs or problem which is based on any weakness or default in the customer’s
applications or products, or the application or use by customer’s third party customers. The customer is re sponsible for all necessary testing for the
customer’s applications and products using NVE products in order to avoid a default of the applications and the products or of the application or use by
customer’s third party customers. NVE accepts no liability in this respect.
Limiting Values
Stress above one or more limiting values (as defined in the Absolute Maximum Ratings System of IEC 60134) will cause permanent damage to the
device. Limiting values are stress ratings only and operation of the device at these or any other conditions above those given in the recommended
operating conditions of the datasheet is not warranted. Constant or repeated exposure to limiting values will permanently and irreversibly affect the
quality and reliability of the device.
Terms and Conditions of Sale
In case an individual agreement is concluded only the terms and conditions of the respec tive agreement shall apply. NVE hereby expressly objects to
applying the customer’s general terms and conditions with regard to the purchase of NVE products by customer.
No Offer to Sell or License
Nothing in this document may be interpreted or construed as an offer to sell products that is open for acceptance or the grant, conveyance or implication
of any license under any copyrights, patents or other industrial or intellectual property rights.
Export Control
This document as well as the items described herein may be subject to export control regulations. Export might require a prior authorization from nati onal authorities.
Automotive Qualified Products
Unless the datasheet expressly states that a specific NVE product is automotive qualified, the product is not suitable for automotive use. It is neither
qualified nor tested in accordance with automotive testing or application requirements. NVE accepts no liability for inclusion or use of non-automotive
qualified products in automotive equipment or applications.
In the event that customer uses the product for design-in and use in automotive applications to automotive specifications and standards, customer (a) shall
use the product without NVE’s warranty of the product for such automotive applications, use and specifications, and (b) whenever customer uses the
product for automotive applications beyond NVE’s specifications such use shall be solely at customer’s own risk, and (c) customer fully indemnifies
NVE for any liability, damages or failed product claims resulting from customer design and use of the product for automotive applications beyond NVE’s
standard warranty and NVE’s product specifications.
IL422
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NVE Corporation 11409 Valley View Road Eden Prairie, MN 55344-3617 USA Telephone: (952) 829-9217 Fax (952) 829-9189 Internet: www.isoloop.com
An ISO 9001 Certified Company
NVE Corporation
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
Telephone: (952) 829-9217
Fax: (952) 829-9189
www.nve.com
e-mail: iso-info@nve.com
©NVE Corporation
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner.
ISB-DS-001-IL422-Q February 2012