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IL485-3V
Isolated RS485-3V Interface
Functional Diagram Features
ISOLOOP(R)
* 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
Function Table
VID (A-B) DE RE ISODE R D MODE
* 60 mA Driver Output Capability * Thermal Shutdown Protection * Meets or Exceeds ANSI RS-485 and ISO 8482:1987 (E) * -40C to +85C Temperature Range * PROFIBUS International Component Recognition * 16 Pin SOIC Package * UL1577 Approval Pending * IEC 61010-1 Approval Pending
L L H L L L L L X H H L H L Z H L H X X X H L X Receive Receive Receive/Drive Drive Drive Receive
on Long Bus Lines in Noisy Environments
0.2V -0.2V -7L L X H H L
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(R) 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.
H= High Level, L= Low Level, X= Irrelevant, Z= High Impedance
Ordering Information
Order as IL485-3V. If requesting tape and reel, please specify as IL485-3VTR.
Isoloop(R) is a registered trademark of NVE Corporation * US Patent number 5,831,426; 6,300,617 and others
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
Absolute Maximum Ratings
Parameters Storage Temperature Ambient Operating Temperature Voltage Range at A or B Bus Pins Supply Voltage(1) Digital Input Voltage Digital Output Voltage Continuous Total Power Dissipation Maximum Output Current Lead Solder Temperature (10s) ESD
ISOLOOP(R)
Symbol TS TA VDD1,VDD2
Min. -65 -40 -7 -0.5 -0.5 -0.5
Max. 150 85 12 7 VDD+ 0.5 VDD+ 0.1 725 377 95
Units o C
o
C
V V V V mW (25C) mW (85C) mA C
IO
260 2kV Human Body Model
Insulation Specifications
Parameter Creepage Distance (External) Barrier Impedance Leakage Current Condition 240 VRMS 60Hz Min. 8.077 Typ. >1014 ||7 0.2 Max. Units mm || pF A
Recommended Operating Conditions
Parameters Supply Voltage Input Voltage at any bus terminal (separately or common mode) High-Level Digital Input Voltage (VDD1=3.3 V)
(VDD1=5.0 V)
Symbol VDD1 VDD2 VI VIC VIH VIL VID IOH IOH IOL IOL TA tIR,tIF
Min. 3.0 4.5
Max. 5.5 5.5 12 -7
Units V V
2.4 3.0 0.8 +12/-7 -60 8 60 8 -40 85 DC Stable
V V V mA mA mA mA C
Low-Level Digital Input Voltage Differential Input Voltage(2) High-Level Output Current (Driver) High-Level Digital Output Current (Receiver) Low-Level Output Current (Driver) Low-Level Digital Output Current (Receiver) Operating Free Air Temperature Digital Input Signal Rise and Fall Times
IEC61010-1
TUV Certificate Numbers: Approval Pending Classification as Table 1. Model IL485-3V Pollution Degree II Material Group III Max Working Voltage 300 VRMS Package Type 16-SOIC (0.3'')
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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
IL485-3V
Driver Section All Specifications are Tmin to Tmax unless otherwise stated.
Parameter Input Clamp Voltage Output Voltage Differential Output Voltage Differential Output Voltage(6) Differential Output Voltage Change in Magnitude of (7) Differential Output Voltage Common Mode Output Voltage Change in Magnitude of (7) Common Mode Output Voltage Output Current(4) High Level Input Current Low Level Input Current Short-Circuit Output Current Symbol VIK VO |VOD1| |VOD2| VOD3 |VOD| VOC |VOC| IO IIH IIL IOS Min. 0 1.5 1.5 1.5 Typ.(5) Max. -1.5 6 6 5 5 0.2 3 -1 0.2 1 -0.8 10 -10 -250 -150 250 34 10 7 Max. 25 6 10 65 35 50 32 8 Units V V V V V V V V mA mA A A mA Test Conditions IL=-18mA IO=0 IO=0 RL=54 Vtest=-7 to 12V RL=54 or 100 RL=54 or 100 RL=54 or 100 Output Disabled VO=12 VO=-7 V1=3.5 V V1=0.4 V VO= -6 V O= 0 V O= 8 No Load (Outputs Enabled)
ISOLOOP(R)
2.5
Supply Current (VDD2= +5V) (VDD1= +5V) (VDD1= +3.3V) Switching Characteristics Parameter Maximum Data Rate Differential Output Delay Time Pulse Skew(10) Differential Output Transition Time Output Enable Time To High Level Output Enable Time To Low Level Output Disable Time From High Level Output Disable Time From Low Level Skew Limit(3)
IDD2 IDD1 IDD1 Symbol tD(OD) tSK(P) tT(OD) tPZH tPZL tPHZ tPLZ tSK(LIM) Min. 35
27 5 3.2 Typ.(5) 16 1 8 31 22 28 16 2
mA
Units Mbd ns ns ns ns ns ns ns ns
Test Conditions RL=54, CL=50pF RL=54, CL=50pF RL=54, CL=50pF RL=54, CL=50pF RL=54, CL=50pF RL=54, CL=50pF RL=54, CL=50pF RL=54, CL=50pF RL=54, 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
IL485-3V
Parameter Positive-going Input Threshold Voltage Negative-going Input Threshold Voltage Hysteresis Voltage (VIT+ - VIT-) High Level Digital Output Voltage Low Level Digital Output Voltage High-impedance-state output current Line Input Current Input Resistance SuSupply Current (VDD2= +5V) (VDD1= +5V) (VDD1= +3.3V)
(8)
ISOLOOP(R)
Receiver Section All Specifications are Tmin to Tmax unless otherwise stated.
Symbol VIT+ VITVhys VOH VOL IOZ II rI IDD2 IDD1 IDD1 Symbol tPD tSK(P) tSK(lim) tPZH tPZL tPHZ tPLZ Min. 35 50 27 5 3.2 34 10 7 VDD - 0.2 0.2 20 1 -0.8 k mA No Load (Outputs Enabled) -0.2 60 Min. Typ.(5) Max. 0.2 Units V V mV V V A mA VID= 200mV, IOH = -20A VID= -200mV, IOL = 20A VO = 0.4 to (VDD2 - 0.5) V Other Input(11) = 0V VI=12V VI= -7V Test Conditions VO = 2.7V, Io= - 0.4mA VO = 0.5V, Io= 8mA
Switching Characteristics @ 5V Parameter Maximum Data Rate Propagation Time(9) Pulse Skew(10) Skew Limit(3) Output Enable Time To High Level Output Enable Time To Low Level Output Disable Time From High Level Output Disable Time From Low Level Switching Characteristics @ 3.3V Parameter Maximum Data Rate Propagation Time(9) Pulse Skew(10) Skew Limit(3) Output Enable Time To High Level Output Enable Time To Low Level Output Disable Time From High Level Output Disable Time From Low Level Symbol tPD tSK(P) tSK(lim) tPZH tPZL tPHZ tPLZ Min. 35 Typ.(5) 27 2 4 20 33 33 20 Max. 32 6 8 24 45 45 27 Units Mbd ns ns ns ns ns ns ns Test Conditions RL=54, CL=50pF VO=-1.5 to 1.5V, CL=15pF VO=-1.5 to 1.5V, CL=15pF RL=54, CL=50pF CL=15pF CL=15pF CL=15pF CL=15pF Typ.(5) 24 1 2 17 30 30 18 Max. 32 6 8 24 45 45 27 Units Mbd ns ns ns ns ns ns ns Test Conditions RL=54, CL=50pF VO=-1.5 to 1.5V, CL=15pF VO=-1.5 to 1.5V, CL=15pF RL=54, CL=50pF CL=15pF CL=15pF CL=15pF 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
IL485-3V
Notes:
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 = 25C. 6. The minimum VOD2 with a 100 load is either 1/2 VOD1 or 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. 1.
ISOLOOP(R)
Application Notes:
Power Consumption Isoloop devices 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 VDD1 and VDD2 should be bypassed with 47 nF capacitors. These should be placed no further than 1 cm from the device pins for proper operation. In addition, VDD2 should have a 10 F tantalum capacitor connected in parallel with the 47 nF capacitor.
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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
IL485-3V
Pin Configuration
ISOLOOP(R)
Connected Internally: Pins 2 & 8 Pins 9 & 15
Pin Description
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Mnemonic VDD1 GND1 R RE DE D nc GND1 GND2 ISODE nc A B nc GND2 VDD2 Description Input Power Supply Input Power Supply Ground Return Output Data from Bus Read Data Enable (if RE is high, R=high impedance) Drive Enable Data Input to Bus No Internal Connection Input Power Supply Ground Return Output Power Supply Ground Return Isolated DE Output for use in Profibus applications where the state of the drive enable node needs to be monitored No Internal Connection `A' Bus Connection to RS485 (True) `B' Bus Connection to RS485 (Inverse) No Internal Connection Output Power Supply Return Output Power Supply
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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
IL485-3V
IL485-3V (0.3'' SOIC-16 Package)
ISOLOOP(R)
IR Soldering Profile
Recommended profile shown. Maximum temperature allowed on any profile is 260 C.
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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
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-IL485-3V-A December 2002

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