IL3585E - N/A - Product.Network

IL3585

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

PROFIBUS Compatible Isolated RS485 Interface

Functional Diagram

VID (A-B) DE RE R D Mode

≥ 200 mV L L H X Receive

≤ -200 mV L L L X Receive

≥1.5 V H L H H Drive

≤ -1.5 V H L L L Drive

X X H Z X Hi Z R

Features

• 3.3 / 5 V Input Supply Compatible

• 2500 VRMS Isolation (1 min)

• 20 ns Propagation Delay

• 40 Mbps Data Rate

• 5 ns Pulse Skew

• 20 kV/us Transient Immunity

• Thermal Shutdown Protection

• -40°C to +85°C Temperature Range

• PROFIBUS Compliant

• 16 Pin SOIC Package

• UL1577 Approval Pending

• IEC 61010-1 Approval Pending

Applications

• Security Networks

• ProfiBus DP and FMS Networks

• Building Environmental Controls

• Industrial Control Networks

• Gaming Systems

• Factory Automation

Description

The IL3585 is a galvanically isolated, high-speed differential bus

transceiver, designed for bi-directional data communication on

balanced transmission lines. Isolation is achieved through patented*

Isoloop® technology. The IL3585 offers an exceptional 2.5 V

differential output into a 54 Ωload, which translates to better data

integrity over longer cable lengths, even at data rates as high as 40

Mbps. The device is also compatible with 3.3V input supplies,

allowing interface to standard microcontrollers without the need for

additional level shifting components.

The IL3585 has current limiting and thermal shutdown features to

protect against output short circuits and bus contention situations

which may cause excessive power dissipation.

IL3585

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 VDD+0.5 V

Digital Output Voltage -0.5 VDD+1 V

Recommended Operating Conditions

Parameters Symbol Min. Typ. Max. Units Test Conditions

Supply Voltage VDD1

VDD2

3.0

4.5

5.5

Input Voltage at any Bus Terminal

(separately or common mode)

VIC

-7

High-Level Digital Input Voltage VIH 2.4

3.0

V VDD1= 3.3 V

VDD1= 5.0 V

Low-Level Digital Input Voltage VIL 0.8 V

Differential Input Voltage (2) V

ID +12/-7 V

High-Level Output Current (Driver) IOH -60 60 mA

High-Level Digital Output Current

(Receiver)

IOH -8 8 mA

Low-Level Output Current (Driver) IOL -60 60 mA

Low-Level Digital Output Current

(Receiver)

IOL -8 8 mA

Ambient Operating Temperature TA -40 85 °C

Digital Input Signal Rise and Fall

Times

tIR,tIF DC Stable

Insulation Specifications

Parameters Symbol Min. Typ. Max. Units Test Conditions

Creepage Distance (external) 8.077

Barrier Impedance Ω || pF >1014||7

Leakage Current 0.2 µARMS 240 VRMS, 60 Hz

Safety & Approvals

IEC61010-1

TUV Certificate Numbers: Approval Pending

Classification

Model Package Pollution Degree Material Group Max. Working Voltage

IL3585 SOIC (0.3") II III 300 VRMS

UL 1577

Component Recognition program. File #: Approval Pending

Rated 2500VRMS for 1 minute (SOIC)

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.

IL3585

Pin Connections

1 VDD1 Input Power Supply

2 GND1 Input Power Supply Ground Return. (Pin 2

is internally connected to Pin 8)

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. (Pin 8

is internally connected to Pin 2)

9 GND2 Output Power Supply Ground Return. (Pin 9

is internally connected to Pin 15)

10 ISODE Isolated DE Output for us in Profibus

applications where the state of the isolated

drive enable node needs to be monitored.

11 NC 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. (Pin

15 is internally connected to Pin 9)

16 VDD2 Output Power Supply

IL3585

Driver Section

Electrical Specifications are Tmin to Tmax 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 V

DD V IO = 0

Differential Output Voltage(2) |VOD1| VDD V IO = 0

Differential Output Voltage(2) |VOD2| 2.5 3 5 V

RL = 54 Ω, VDD = 5 V

Differential Output Voltage(2)(6) VOD3 2.3 5 V

RL = 54 Ω, VDD = 4.5 V

Change in Magnitude of Differential

Output Voltage(7) ∆|VOD| ±0.2 V

RL = 54 Ω or 100 Ω

Common Mode Output Voltage VOC 3 V

RL = 54 Ω or 100 Ω

Change in Magnitude of Common

Mode Output Voltage(7) ∆|VOC| ±0.2 V

RL = 54 Ω or 100 Ω

Output Current(4) IO 1

-0.8

mA Output Disabled, VO = 12

O = -7

High Level Input Current IIH 10

µA V1 = 3.5 V

Low Level Input Current IIL -10

µA V1 = 0.4 V

Absolute |Short-circuit Output Current| IOS 60 250

µA -7 V> VO <12 V

Supply Current (V DD2 = +5 V)

(V DD1 = +5 V)

(V DD1 = +3.3 V)

IDD2

IDD1

mA No Load

(Outputs Enabled)

Switching Specifications

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

Maximum Data Rate 40 Mbps RL = 54 Ω, CL = 50 pF

Differential Output Prop Delay tD(OD) 20 30 ns RL = 54 Ω, CL = 50 pF

Pulse Skew(10) t

S(P) 1 6 ns

RL = 54 Ω, CL = 50 pF

Differential Output Rise & Fall Time tT(OD) 5 8 ns RL = 54 Ω, CL = 50 pF

Output Enable Time To High Level tPZH 20 30 ns

RL = 54 Ω, CL = 50 pF

Output Enable Time To Low Level tPZL 20 30 ns

RL = 54 Ω, CL = 50 pF

Output Disable Time From High Level tPHZ 20 30 ns

RL = 54 Ω, CL = 50 pF

Output Disable Time From Low Level tPLZ 20 30 ns

RL = 54 Ω, CL = 50 pF

Skew Limit(3) t

SK(LIM) 2 12 ns RL = 54 Ω, CL = 50 pF

Notes: These 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. While –7 V<VCM>12 V, the minimum VOD2 with a 54 Ω load is either ½ VOD1 or 2.3 V, whichever is greater.

7. ∆|VOD| and ∆ |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 10 ns read enable time. Maximum propagation delay is 25 ns after read assertion.

10. Pulse skew is defined as the |tPLH –tPHL| of each channel.

11. Absolute Maximum specifications mean the device will not be damaged if operated under these conditions. It does not guarantee

performance.

IL3585

Receiver Section

Electrical Specifications are Tmin to Tmax unless otherwise stated.

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

Positive-going Input Threshold

Voltage

VIT+ 0.2 V -7 V>VCM<12 V

Negative-going Input Threshold

Voltage

VIT- –0.2 V -7 V>VCM<12 V

Hysteresis Voltage (VIT+ - VIT-) VHYS 40 mV VCM =0 V, T=25°C

High Level Digital Output Voltage VOH VDD – 0.2 VDD 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 ±1

µA VO = 0.4 to (VDD2 - 0.5)

Line Input Current(8) I

I 1 mA VI = 12 V

-0.8 mA VI = -7 V

Input Resistance RI 20 kΩ

Supply Current (V DD2 = +5V)

(V DD1 = +5V)

(V DD1 = +3.3V)

IDD2

IDD1

mA No load Outputs

Enabled

Switching Characteristics @ 5 V

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

Maximum Data Rate 40 Mbps RL = 54 Ω, CL = 50 pF

Propagation Delay(9) tPD 27 35 ns VO = -1.5 to 1.5 V,

CL = 15 pF

Pulse Skew(10) t

SK(P) 1 6 ns VO = -1.5 to 1.5 V,

CL = 15 pF

Skew Limit(3) t

SK(LIM) 2 12 ns

RL = 54 Ω, CL = 50 pF

Output Enable Time To High Level tPZH 15 25 ns CL = 15 pF

Output Enable Time To Low Level tPZL 15 25 ns CL = 15 pF

Output Disable Time From High Level tPHZ 15 25 ns CL = 15 pF

Output Disable Time From Low Level tPLZ 15 25 ns CL = 15 pF

Switching Characteristics @ 3.3 V

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

Maximum Data Rate 40 Mbps RL = 54 Ω, CL = 50 pF

Propagation Delay(9) tPD 30 38 ns VO = -1.5 to 1.5 V,

CL = 15 pF

Pulse Skew(10) t

SK(P) 1 6 ns VO = -1.5 to 1.5 V,

CL = 15 pF

Skew Limit(3) t

SK(LIM) 4 12 ns

RL = 54 Ω, CL = 50 pF

Output Enable Time To High Level tPZH 17 27 ns CL = 15 pF

Output Enable Time To Low Level tPZL 17 27 ns CL = 15 pF

Output Disable Time From High Level tPHZ 17 27 ns CL = 15 pF

Output Disable Time From Low Level tPLZ 17 27 ns CL = 15 pF

IL3585

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

Power Consumption

Isoloop devices achieve their low power consumption by detecting

the edge transitions of the input logic signal and converting these to

narrow current pulses. This technique creates a supply current

which is proportional to data rate, which has obvious advantages

over optocouplers whose power consumption is dependent on

mark:space ratio.

Table 2. Typical Dynamic Supply Currents.

Data Rate (Mbps) IDD1 IDD2

1 300 µA 300 µA

10 3 mA 3 mA

20 6 mA 6 mA

40 12 mA 12 mA

Power Supplies

It is required that low ESR capacitors such as ceramic are used 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. In addition, V DD2 should have a

10 µF tantalum capacitor connected in parallel with the 47 nF

capacitor.

DC Correctness

The IL3585 incorporates a patented refresh circuit which

effectively maintains the correct output state with respect to data

input. At power up, the bus outputs will follow the Function Table

shown on Page 1. It is recommended that the DE input is always

held low during power up to eliminate false drive data pulses from

the bus. The use of an external power supply monitor to minimize

glitches caused by slow power-up and power-down transients is not

required.

Application Information_______________________

Receiver Features

The IL3585 receiver includes a “fail-safe if open” function that

guarantees a high level receiver output if the receiver inputs are

unconnected (floating). IL3585 receiver outputs have tri-state

capability via the active low RE input.

Driver Features

The RS-485 driver is a differential output device that delivers at

least 1.5 V across a 54 Ω load. The drivers feature low propagation

delay skew to maximize bit width and to minimize EMI. The

IL3585 drivers have tri-state capability via the active high DE

input.

Receiver Data Rate, Cables and Terminations

This device is intended for network lengths up to 4000', but the

maximum system data rate decreases as the transmission line length

increases. Twisted pair cable should be used in all networks since

they tend to pick up noise and other electromagnetically induced

voltages as common mode signals, which are effectively rejected

by the differential receivers in these ICs.

IL3585

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

IL3585 (0.3'' SOIC-16 Package)

Ordering Information and Valid part Numbers

IL3585

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 is a high technology components manufacturer having the unique capability to combine leading edge Giant Magnetoresistive

(GMR) materials with integrated circuits to make high performance electronic components. Products include Magnetic Field Sensors, Magnetic

Field Gradient Sensors (Gradiometer), Digital Magnetic Field Sensors, Digital Signal Isolators and Isolated Bus Transceivers.

NVE is a leader in GMR research and in 1994 introduced the world’s first products using GMR material, a line of GMR magnetic field sensors

that can be used for position, magnetic media, wheel speed and current sensing.

NVE is located in Eden Prairie, Minnesota, a suburb of Minneapolis. Please visit our Web site at www.nve.com or call 952-829-9217 for

information on products, sales or distribution.

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. The use of NVE Corporation’s products in such

applications is understood to be entirely at the customer’s own risk.

Specifications shown are subject to change without notice.

ISB-DS-001-IL3585-B

January 26, 2005