NVE Corporation 11409 Valley View Road Eden Prairie, MN 55344-3617 USA Telephone: (952) 829-9217 Fax: (952) 829-9189 Internet: www.isoloop.com
IL485-3VISOLOOP®
Functional Diagram Features
·3.3 V Input Supply Compatible
·2500 VRMS Isolation (1 min)
·25 ns Maximum Propagation Delay
·35 MBaud 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 Approval Pending
·IEC 61010-1 Approval Pending
Applications
·PROFIBUS/RS485
·RS-485 Systems
·Multiple Data Point Transmission
Description
The IL485-3V is a galvanically isolated, high speed differential
bus transceiver, designed for bidirectional data communication
on balanced transmission lines. Isolation is achieved through
patented*Isoloop®technology. The IL485-3V is the first isolated
RS-485 interface available in a standard 16 pin SOIC package,
which meets the ANSI Standards EIA/TIA-422-B and RS485
and is compatible with 3.3V input supplies.
The IL485-3V has current limiting and thermal shutdown
features to protect against output short circuits and bus
contention situations where these may cause excessive power
dissipation.
With 1 nsec pulse skew and 16 nsec propagation delay, the IL485
is ideal for PROFIBUS applications.
Isolated RS485-3V Interface
Function Table
VID
(A-B) DE RE ISODE R D MODE
≥ 0.2V L L L H X Receive
≤−0.2V L L L L X Receive
-7<VID<12 X H X Z X Receive/Drive
≥ 1.5 H L H H H Drive
≤−1.5 H L H L L Drive
Open L L L H X Receive
H= High Level, L= Low Level,
X= Irrelevant, Z= High Impedance
Isoloop®is a registered trademark of NVE Corporation
* US Patent number 5,831,426; 6,300,617 and others
Ordering Information
Order as IL485-3V. If requesting tape and reel,
please specify as IL485-3VTR.
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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
IL485-3VISOLOOP®
Recommended Operating Conditions
Parameters Symbol Min. Max. Units
Supply Voltage VDD13.0 5.5 V
VDD2 4.5 5.5
Input Voltage at any bus terminal VI12 V
(separately or common mode) VIC -7
High-Level Digital Input Voltage (VDD1=3.3 V) VIH
2.4 V
(VDD1=5.0 V) 3.0
Low-Level Digital Input Voltage VIL 0.8 V
Differential Input Voltage(2) VID +12/-7 V
High-Level Output Current (Driver) IOH -60 mA
High-Level Digital Output Current (Receiver) IOH 8mA
Low-Level Output Current (Driver) IOL 60 mA
Low-Level Digital Output Current (Receiver) IOL 8mA
Operating Free Air Temperature TA-40 85 °C
Digital Input Signal Rise and Fall Times tIR,tIF DC Stable
Absolute Maximum Ratings
Parameters Symbol Min. Max. Units
Storage Temperature TS-65 150 oC
Ambient Operating Temperature TA-40 85 oC
Voltage Range at A or B Bus Pins -7 12 V
Supply Voltage(1) VDD1,VDD2-0.5 7 V
Digital Input Voltage -0.5 VDD+ 0.5 V
Digital Output Voltage -0.5 VDD+ 0.1 V
Continuous Total Power Dissipation 725 mW (25°C)
377 mW (85°C)
Maximum Output Current IO95 mA
Lead Solder Temperature (10s) 260 °C
ESD 2kV Human Body Model
Insulation Specifications
Parameter Condition Min. Typ. Max. Units
Creepage Distance (External) 8.077 mm
Barrier Impedance >1014 ||7 Ω || pF
Leakage Current 240 VRMS 0.2 µA
60Hz
Model Pollution Material Max Working Package Type
Degree Group Voltage 16–SOIC (0.3'')
IL485-3V II III 300 VRMS 9
IEC61010-1
TUV Certificate Numbers: Approval Pending
Classification as Table 1.
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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
IL485-3VISOLOOP®
Driver Section
All Specifications are Tmin to Tmax unless otherwise stated.
Parameter Symbol Min. Typ.(5) Max. Units Test Conditions
Input Clamp Voltage VIK -1.5 V IL=-18mA
Output Voltage VO06VI
O=0
Differential Output Voltage |VOD1| 1.5 6 V IO=0
Differential Output Voltage(6) |VOD2| 1.5 2.5 5 V RL=54Ω
Differential Output Voltage VOD31.5 5 V Vtest=-7 to 12V
Change in Magnitude of (7) ∆|VOD| ±0.2 V RL=54 or 100Ω
Differential Output Voltage
Common Mode Output Voltage VOC 3V R
L=54 or 100Ω
-1
Change in Magnitude of (7) ∆|VOC| ±0.2 V RL=54 or 100Ω
Common Mode Output Voltage
Output Current(4) IO1mA Output Disabled VO=12
-0.8 mA VO=-7
High Level Input Current IIH 10 µAV
1=3.5 V
Low Level Input Current IIL -10 µAV
1=0.4 V
Short-Circuit Output Current IOS -250 mA VO= -6
-150 VO= 0
250 VO= 8
Supply Current (VDD2= +5V) IDD227 34
No Load (Outputs Enabled)
(VDD1= +5V) IDD1510mA
(VDD1= +3.3V) IDD13.2 7
Switching Characteristics
Parameter Symbol Min. Typ.(5) Max. Units Test Conditions
Maximum Data Rate 35 Mbd RL=54Ω, CL=50pF
Differential Output Delay Time tD(OD)1625nsR
L=54Ω, CL=50pF
Pulse Skew(10) tSK(P)1 6 ns RL=54Ω, CL=50pF
Differential Output Transition Time tT(OD) 8 10 ns RL=54Ω, CL=50pF
Output Enable Time To High Level tPZH 31 65 ns RL=54Ω, CL=50pF
Output Enable Time To Low Level tPZL 22 35 ns RL=54Ω, CL=50pF
Output Disable Time From High Level tPHZ 28 50 ns RL=54Ω, CL=50pF
Output Disable Time From Low Level tPLZ 16 32 ns RL=54Ω, CL=50pF
Skew Limit(3) tSK(LIM)28nsR
L=54Ω, CL=50pF
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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
IL485-3VISOLOOP®
Receiver Section
All Specifications are Tmin to Tmax unless otherwise stated.
Parameter Symbol Min. Typ.(5) Max. Units Test Conditions
Positive-going Input Threshold Voltage VIT+0.2 V VO= 2.7V, Io= - 0.4mA
Negative-going Input Threshold Voltage VIT-–0.2 V VO= 0.5V, Io= 8mA
Hysteresis Voltage (VIT+- VIT-)Vhys 60 mV
High Level Digital Output Voltage VOH VDD – 0.2 V VID= 200mV, IOH = -20µA
Low Level Digital Output Voltage VOL 0.2 V VID= -200mV, IOL = 20µA
High-impedance-state output current IOZ ±20 µAV
O= 0.4 to (VDD2- 0.5) V
Line Input Current(8) II1 mA Other Input(11) = 0V VI=12V
-0.8 VI= –7V
Input Resistance rI50 kΩ
SuSupply Current (VDD2= +5V) IDD227 34
No Load (Outputs Enabled)
(VDD1= +5V) IDD1510mA
(VDD1= +3.3V) IDD13.2 7
Switching Characteristics @ 5V
Parameter Symbol Min. Typ.(5) Max. Units Test Conditions
Maximum Data Rate 35 Mbd RL=54Ω, CL=50pF
Propagation Time(9) tPD 24 32 ns VO=-1.5 to 1.5V, CL=15pF
Pulse Skew(10) tSK(P)1 6 ns VO=-1.5 to 1.5V, CL=15pF
Skew Limit(3) tSK(lim) 2 8 ns RL=54Ω, CL=50pF
Output Enable Time To High Level tPZH 17 24 ns CL=15pF
Output Enable Time To Low Level tPZL 30 45 ns CL=15pF
Output Disable Time From High Level tPHZ 30 45 ns CL=15pF
Output Disable Time From Low Level tPLZ 18 27 ns CL=15pF
Switching Characteristics @ 3.3V
Parameter Symbol Min. Typ.(5) Max. Units Test Conditions
Maximum Data Rate 35 Mbd RL=54Ω, CL=50pF
Propagation Time(9) tPD 27 32 ns VO=-1.5 to 1.5V, CL=15pF
Pulse Skew(10) tSK(P)2 6 ns VO=-1.5 to 1.5V, CL=15pF
Skew Limit(3) tSK(lim) 4 8 ns RL=54Ω, CL=50pF
Output Enable Time To High Level tPZH 20 24 ns CL=15pF
Output Enable Time To Low Level tPZL 33 45 ns CL=15pF
Output Disable Time From High Level tPHZ 33 45 ns CL=15pF
Output Disable Time From Low Level tPLZ 20 27 ns CL=15pF
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.
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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
IL485-3VISOLOOP®
Notes:
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 difference in any two channels
in one device.
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= 5V or VDD1= 3.3 V
and TA= 25°C.
6. The minimum VOD2with a 100Ωload is either ½ VOD1or
2V, 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 8 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.
Application Notes:
Power Consumption
Isoloopdevices achieve their low power consumption from
the manner by which 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 2.5ns wide, the power consumption is independent of
mark-to-space ratio and solely dependent on frequency. This
has obvious advantages over optocouplers whose power
consumption is heavily dependent on its on-state and
frequency.
The approximate power supply current per channel for
Power Supplies
It is recommended that low ESR ceramic capacitors be
used to decouple the supplies. Both VDD1and VDD2should
be bypassed with 47 nF capacitors. These should be placed
no further than 1 cm from the device pins for proper
operation. In addition, VDD2should have a 10 µF tantalum
capacitor connected in parallel with the 47 nF capacitor.
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IL485-3VISOLOOP®
Pin Configuration
Pin Description
Pin Mnemonic Description
1V
DD1Input Power Supply
2 GND1Input Power Supply Ground Return
3 R Output Data from Bus
4RE 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 GND1Input Power Supply Ground Return
9 GND2Output Power Supply Ground Return
10 ISODE Isolated DE Output for use in Profibus applications where the
state of the drive enable node needs to be monitored
11 nc No Internal Connection
12 A ‘A’ Bus Connection to RS485 (True)
13 B ‘B’ Bus Connection to RS485 (Inverse)
14 nc No Internal Connection
15 GND2Output Power Supply Return
16 VDD2Output Power Supply
Connected Internally:
Pins 2 & 8
Pins 9 & 15
NVE Corporation 11409 Valley View Road Eden Prairie, MN 55344-3617 USA Telephone: (952) 829-9217 Fax: (952) 829-9189 Internet: www.isoloop.com
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IL485-3VISOLOOP®
NVE Corporation 11409 Valley View Road Eden Prairie, MN 55344-3617 USA Telephone: (952) 829-9217 Fax: (952) 829-9189 Internet: www.isoloop.com
IL485-3V (0.3'' SOIC-16 Package)
IR Soldering Profile
Recommended profile
shown. Maximum
temperature allowed on
any profile is 260° C.
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
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.
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-IL485-3V-A
December 2002
