IL485WETR13 - NVE Corporation

IL485W

Isoloop is a registered trademark of NVE Corporation.

*U.S. Patent number 5,831,426; 6,300,617 and others.

REV. N

Isolated RS485 Interface With Handshake

Functional Diagram

ISODE

OUT

IL485W

VID (A–B) DE RE ISODE R D Mode

≥ 200 mV L L L H X Receive

≤−200 mV L L L L X Receive

−7<VI<12 X H X Z X Receive/Drive

≥ 1.5 V H L H H H Drive

≤−1.5 V H L H L L Drive

Open L L L H X Indeterminate

H = High Level, L = Low Level

X = Irrelevant, Z = High Impedance

RE IN1 OUT1

L L L

L H H

H X Z

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

• 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.

IL485W

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 4.5 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 3.0 VDD1 V

Low-Level Digital Input Voltage VIL 0 0.8 V

Differential Input Voltage(2) V

ID +12/−7 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

IL485W 0.3" SOIC II III 300 VRMS

UL 1577

Component Recognition Program File Number: E207481

Rated 2500VRMS for 1 minute

Soldering Profile

Per JEDEC J-STD-020C, MSL=2

IL485W

IL485W Pin Connections

1 VDD1 Input Power Supply

2 GND1 Input Power Supply Ground Return

3 R Output Data from Bus

4 OUT1 Output from Auxiliary Isolation Channel

RE Read Data Enable

(if RE is high, R= high impedance)

6 DE Drive Enable

7 D Data Input to Bus

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 IN1 No Internal Connection

12 A Non-inverting Bus Line

13 B Inverting Bus Line

14 NC No Internal Connection

15 GND2 Output Power Supply Ground Return

16 VDD2 Output Power Supply

OUT1

VDD2

GND1

GND2

RNC

IN1

ISODE

GND1

VDD1

GND2

IL485W

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 VIK −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

−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

−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 mΑ VO = −6 V

VO = 0 V

VO = 8 V

Supply Current IDD1 4 6 mA

No Load

(Outputs Enabled)

Switching Specifications

Parameters Symbol Min. Typ.(5) Max. Units Test Conditions

Maximum Data Rate 35 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

SK(LIM) 2 12 ns RL = 54 Ω, CL = 50 pF

Notes (apply to both driver and receiver sections):

1. All voltage values are with respect to network 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 from 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).

IL485W

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 ±20 μA VO = 0.4 to (VDD2−0.5) V

Line Input Current(8) I

−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

Parameters Symbol Min. Typ.(5) Max. Units Test Conditions

Maximum Data Rate 35 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

SK(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

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 tp = 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 tp = 8µs

Damped Oscillatory Magnetic Field HOSC 1800 2000 A/m 0.1Hz – 1MHz

Cross-axis Immunity Multiplier(12) K

X 2.5

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 failu re.

IL485W

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

Electromagnetic Compatibility

The IL485W 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 at right.

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 have 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

Both VDD1 and VDD2 must be bypassed with 47 nF ceramic

capacitors. These should be placed as close as possible to VDD pins

for proper operation. Additionally, VDD2 should be bypassed with a

10 µF tantalum capacitor.

Application

PROFIBUS Fault Interrogation

IL485W IL485W

fMAX 4

IL485W

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 485W E TR13

Bulk Packaging

Blank = Tube

TR = 13'' Tape and Reel

Package

Blank = 80/20 Tin/Lead Plating

E = RoHS Compliant

Base Part Number

485W = RS-485 Transceiver

with handshake

Product Family

IL = Isolators

Valid Part Numbers

IL485W

IL485WE

All IL485W

part types are

available on

tape and reel.

RoHS

COMPLIANT

IL485W

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-IL485W-N

March 2008 Changes

• Added magnetic field immunity and electromagnetic compatibility specifications.

• Added note on package drawing that pin-spacing tolerances are non-accumulating.

ISB-DS-001-IL485W-M

Changes

• Changed ordering information to reflect that devices are now fully RoHS compliant

with no exempti ons.

ISB-DS-001-IL485W-L

Changes

• Reorganized supply current specifications; misc. minor changes

ISB-DS-001-IL485W-K

April 2007 Changes

• Eliminated soldering profile chart

ISB-DS-001-IL485W-J

December 2006 Changes

• Updated open input state in truth table

ISB-DS-001-IL485W-I Changes

• Updated package drawing; misc.

ISB-DS-001-IL485W-H Changes

• Update UL and IEC approvals

ISB-DS-001-IL485W-G Changes

• Revision letter added.

• Ordering Information removed.

• IEC 61010-1 Classification “Reinforced Insulation” added.

• Notes added.

• Electrostatic Discharge Sensitivity note moved to page 5.

• Electrostatic Discharge Sensitivity Note added.

• Notes moved to page 3.

• Ordering Information added.

IL485W

NVE Corporation 11409 Valley View Road Eden Prairie, MN 55344-3617 USA Telephone: (952) 829-9217 Fax (952) 829-9189 Internet: www.isoloop.com

About NVE

An ISO 9001 Certified Company

NVE Corporation manufactures innovative products based on unique spintronic Giant Magnetoresistive (GMR) technology. Products include

Magnetic Field Sensors, Magnetic Field Gradient Sensors (Gradiometers), Digital Magnetic Field Sensors, Digital Signal Isolators, and Isolated

Bus Transceivers.

NVE pioneered spintronics and in 1994 introduced the world’s first products using GMR material, a line of ultra-precise magnetic sensors for

position, magnetic media, gear speed and current sensing.

NVE Corporation

11409 Valley View Road

Eden Prairie, MN 55344-3617 USA

Telephone: (952) 829-9217

Fax: (952) 829-9189

Internet: www.nve.com

e-mail: isoinfo@nve.com

The information provided by NVE Corporation is believed to be accurate. However, no responsibility is assumed by NVE Corporation for its use,

nor for any infringement of patents, nor rights or licenses granted to third parties, which may result from its use. No license is granted by

implication, or otherwise, under any patent or patent rights of NVE Corporation. NVE Corporation does not authorize, nor warrant, any NVE

Corporation product for use in life support devices or systems or other critical applications, without the express written approval of the

President of NVE Corporation.

ISB-DS-001-IL485W-N

March 2008