IL3522 Isolated RS485/RS422 Interface Features Functional Diagram DE • • • • • • • • • • ISODE Y Z D A B R RE 3.3 / 5 V Input Supply Compatible 2500 VRMS Isolation (1 minute) 20 ns Propagation Delay 40 Mbps Data Rate 1 ns Pulse Skew 20 kV/μs Transient Immunity Thermal Shutdown Protection −40°C to +85°C Temperature Range 16-pin SOIC Package UL1577 and IEC 61010-2001 Approval Applications • • • • • IL3522 IL3522 Receiver RE H L L L R Z H L H V(A−B) X ≥ 200 mV ≤−200 mV Open IL3522 Driver DE L H H D X H L H = High Level, L = Low Level X = Irrelevant, Z = High Impedance V(Y−Z) Z ≥ 200 mV ≤−200 mV Security Networks Building Environmental Controls Industrial Control Networks Gaming Systems Factory Automation Description The IL3522 is a galvanically isolated, high-speed differential bus transceiver, designed for bidirectional data communication on balanced transmission lines. The device uses NVE’s patented* IsoLoop spintronic Giant Magnetoresistance (GMR) technology. The IL3585 delivers an exceptional 2.3 V differential output into a 54 Ω load over the supply range of 4.5 V to 5.5 V. This provides better data integrity over longer cable lengths, even at data rates as high as 40 Mbps. The device is also compatible with 3.3 V input supplies, allowing interface to standard microcontrollers without additional level shifting. Current limiting and thermal shutdown features protect against output short circuits and bus contention that may cause excessive power dissipation. Receiver inputs feature a “fail-safe if open” design, ensuring a logic high R-output if A/B are floating. IsoLoop® is a registered trademark of NVE Corporation. *U.S. Patent number 5,831,426; 6,300,617 and others. Distributed by: Rhopoint Components www.rhopointcomponents.com email: [email protected] REV. E IL3522 Absolute Maximum Ratings(11) Parameters Storage Temperature Ambient Operating Temperature Voltage Range at any Bus Pin Supply Voltage (1) Digital Input Voltage Digital Output Voltage Symbol TS TA VDD1, VDD2 Min. −65 −40 −7 −0.5 −0.5 −0.5 Typ. Max. 150 100 12 7 VDD + 0.5 VDD + 1 Units °C °C V V V V Test Conditions Min. 3.0 4.5 Typ. Max. 5.5 5.5 12 −7 Units Test Conditions VDD1 V 0.8 +12/−7 60 V V mA 8 mA Recommended Operating Conditions Parameters Input Voltage at any Bus Terminal (separately or common mode) Symbol VDD1 VDD2 VI VIC High-Level Digital Input Voltage VIH 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) Ambient Operating Temperature Digital Input Signal Rise and Fall Times VIL VID IOH Supply Voltage 2.4 3.0 0 IOH V V IOL −60 mA IOL −8 mA TA −40 85 tIR, tIF VDD1 = 3.3 V VDD1 = 5.0 V °C DC Stable Insulation Specifications Parameters Creepage Distance (external) Barrier Impedance Leakage Current Symbol Min. 8.08 Typ. Max. > 1014 || 7 0.2 Units mm Ω || pF μARMS Test Conditions 240 VRMS, 60 Hz Safety and Approvals IEC61010-2001 TUV Certificate Numbers: N1502812, N1502812-101 Classification: Reinforced Insulation Model IL3585 Package SOIC (0.3") Pollution Degree II Material Group III Max. Working Voltage 300 VRMS UL 1577 Component Recognition Program File Number: E207481 Rated 2500VRMS for 1 minute Soldering Profile Per JEDEC J-STD-020C, MSL=2 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. 2 Distributed by: Rhopoint Components www.rhopointcomponents.com email: [email protected] IL3522 IL3522 Pin Connections 1 VDD1 Input Power Supply 2 GND1 Input Power Supply Ground Return 3 R 4 RE Read Data Enable (if RE is high, R = high impedance) 5 DE Drive Enable 6 D 7 NC 8 9 Output Data from Bus VDD1 VDD2 GND1 GND2 R A No Internal Connection RE B GND1 Input Power Supply Ground Return DE Z GND2 Output Power Supply Ground Return D Y 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 Data Input to Bus NC ISODE GND2 GND1 IL3522 3 Distributed by: Rhopoint Components www.rhopointcomponents.com email: [email protected] IL3522 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) Input Clamp Voltage VIK Output voltage VO Differential Output Voltage(12) |VOD1| Differential Output Voltage(12) |VOD2| 2.5 3 Differential Output Voltage(12, 6) VOD3 2.3 Change in Magnitude of Differential Δ|VOD| Output Voltage(7) Common Mode Output Voltage VOC Change in Magnitude of Common Δ|VOC| Mode Output Voltage(7) Output Current(4) High Level Input Current Low Level Input Current Absolute |Short-circuit Output Current| VDD1 = +5 V Supply Current VDD1 = +3.3 V IO IIH IIL IOS IDD1 IDD1 4 3 Max. −1.5 VDD VDD 5 5 Units V V V V V ±0.2 V RL = 54 Ω or 100 Ω 3 V RL = 54 Ω or 100 Ω ±0.2 V RL = 54 Ω or 100 Ω 1 −0.8 10 −10 250 6 4 mA μA μA mA mA Test Conditions IL = −18 mA IO = 0 IO = 0 RL = 54 Ω, VDD = 5 V RL = 54 Ω, VDD = 4.5 V Output Disabled, VO = 12 VO = −7 VI = 3.5 V VI = 0.4 V −7 V > VO < 12 V No Load (Outputs Enabled) Notes (apply to both driver and receiver sections): 1. 2. 3. 4. All Voltage values are with respect to network ground except differential I/O bus voltages. Differential input voltage is measured at the noninverting terminal A with respect to the inverting terminal B. Skew limit is the maximum propagation delay difference between any two devices at 25°C. 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. −7 V < VCM < 12 V; 4.5 V < VDD < 5.5 V. 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 10 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. Absolute Maximum specifications mean the device will not be damaged if operated under these conditions. It does not guarantee performance. 12. Differential output voltage is measured at terminal Y with respect to Z. 4 Distributed by: Rhopoint Components www.rhopointcomponents.com email: [email protected] IL3522 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) Positive-going Input Threshold VIT+ Voltage(2) Negative-going Input Threshold −0.2 VITVoltage(2) Hysteresis Voltage (VIT+ − VIT-) VHYS 40 VDD – 0.2 Max. Units 0.2 V −7 V > VCM < 12 V V −7 V > VCM < 12 V mV High Level Digital Output Voltage VOH VDD V Low Level Digital Output Voltage VOL 0.2 V High-impedance-state output current Line Input Current(8) IOZ II ±1 1 −0.8 Input Resistance RI μA mA mA kΩ Supply Current IDD2 8 mA Max. Units Mbps 20 5 Test Conditions VCM = 0 V, T = 25°C VID = 200 mV IOH = −20 μA VID = −200 mV IOH = 20 μA VO=0.4 to (VDD2−0.5) V VI = 12 V VI = −7 V No load (Outputs Enabled) Switching Characteristics Parameters Data Rate Propagation Delay(2, 9) Pulse Skew(2, 10) (3) Symbol tPD 27 35 ns tSK(P) 1 6 ns 12 25 25 25 25 ns ns ns ns ns Max. Units Mbps Skew Limit Output Enable Time To High Level Output Enable Time To Low Level Output Disable Time From High Level Output Disable Time From Low Level tSK(LIM) tPZH tPZL tPHZ tPLZ Parameters Data Rate Symbol Propagation Delay(2, 9) Pulse Skew(2, 10) (3) Skew Limit Output Enable Time To High Level Output Enable Time To Low Level Output Disable Time From High Level Output Disable Time From Low Level VDD1 = +5 V, VDD2 = +5 V Min. Typ.(5) 40 2 15 15 15 15 VDD1 = +3.3 V, VDD2 = +5 V Min. Typ.(5) 40 tPD 30 38 ns tSK(P) 1 6 ns tSK(LIM) tPZH tPZL tPHZ tPLZ 4 17 17 17 17 12 27 27 27 27 ns ns ns ns ns 5 Distributed by: Rhopoint Components www.rhopointcomponents.com email: [email protected] Test Conditions RL = 54 Ω, CL = 50 pF VO = −1.5 to 1.5 V, CL = 15 pF VO = −1.5 to 1.5 V, CL = 15 pF RL = 54 Ω, CL = 50 pF CL = 15 pF CL = 15 pF CL = 15 pF CL = 15 pF Test Conditions RL = 54 Ω, CL = 50 pF VO = −1.5 to 1.5 V, CL = 15 pF VO = −1.5 to 1.5 V, CL = 15 pF RL = 54 Ω, CL = 50 pF CL = 15 pF CL = 15 pF CL = 15 pF CL = 15 pF IL3522 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. Table 2. Typical Dynamic Supply Currents. Data Rate (Mbps) 1 10 20 40 IDD1 100 μA 1 mA 2 mA 4 mA IDD2 100 μA 1 mA 2 mA 4 mA 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. DC Correctness The IL3585 incorporates a patented refresh circuit to maintain the correct output state with respect to data input. At power up, the bus outputs will follow the Function Table shown on Page 1. The DE input should be held low during power-up to eliminate false drive data pulses from the bus. 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 receiver includes a “fail-safe if open” function that guarantees a high level output if the receiver inputs are unconnected (floating). The receiver output “R” has tri-state capability via the active low RE input. Driver Features The RS-422 driver is differential output and delivers at least 1.5 V across a 54 Ω load. Drivers feature low propagation delay skew to maximize bit width and minimize EMI. Drivers have tri-state capability via the active-high DE input. Receiver Data Rate, Cables and Terminations The IL3522 is intended for networks up to 4,000 feet (1,200 m), but the maximum data rate decreases as cable 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. Fail-Safe Operation “Fail-safe operation” is defined here as the forcing of a logic high state on the “R” output in response to an open-circuit condition between the “A” and “B” lines of the bus, or when no drivers are active on the bus. Proper biasing can ensure fail-safe operation, that is a known state when there are no active drivers on the bus. IL3000-Series Isolated Transceivers include internal pull-up and pull-down resistors of approximately 30 kΩ in the receiver section (RFS-INT; see figure below). These internal resistors are designed to ensure failsafe operation but only if there are no termination resistors. The entire VDD will appear between inputs “A” and “B” if there is no loading and no termination resistors, and there will be more than the required 200 mV with up to four RS-422 worstcase Unit Loads of 12 kΩ. Many designs operating below 1 Mbps or less than 1,000 feet are unterminated. Termination resistors may not be necessary for very low data rates and very short cable runs because reflections have time to settle before data sampling, which occurs at the middle of the bit interval. In busses with low-impedance termination resistors, however, the differential voltage across the conductor pair will be close to zero with no active drivers. In this case the state of the bus is indeterminate, and the idle bus will be susceptible to noise. For example, with 120 Ω termination resistors (RT) on each end of the cable, and four Unit Loads (12 kΩ each), without external fail-safe biasing resistors the internal pull-up and pulldown resistors will produce a voltage between inputs “A” and “B” of only about 5 mV. This is not nearly enough to ensure a known state. External fail-safe biasing resistors (RFS-EXT) at one end of the bus can ensure fail-safe operation with a terminated bus. Resistors should be 6 Distributed by: Rhopoint Components www.rhopointcomponents.com email: [email protected] IL3522 selected so that under worst-case power supply and resistor tolerances there is at least 200 mV across the conductor pair with no active drivers to meet the input sensitivity specification of the RS-422 standard. Using the same value for pull-up and pull-down biasing resistors maintains balance for positive- and negative going transitions. Lower-value resistors increase inactive noise immunity at the expense of quiescent power consumption. Note that each Unit Load on the bus adds a worst-case loading of 12 kΩ across the conductor pair, and 32 Unit Loads add 375 Ω worst-case loading. The more loads on the bus, the lower the required values of the biasing resistors. In the example with two 120 Ω termination resistors and four Unit Loads, 560 Ω external biasing resistors provide more than 200 mV between “A” and “B” with adequate margin for power supply variations and resistor tolerances. This ensures a known state when there are no active drivers. Other illustrative examples are shown in the table below. Fail-Safe Biasing 5V RFS-EXT VDD 30K RFS-INT A RFS-EXT Internal Only Internal Only 560 Ω 510 Ω RT None 120 Ω 120 Ω 120 Ω B RFS-EXT 30K RFS-INT GND RT RT R Nominal VA-B (inactive) 238 mV 5 mV 254 mV 247 mV Loading Four unit loads (12 kΩ ea.) Four unit loads (12 kΩ ea.) Four unit loads (12 kΩ ea.) 32 unit loads (12 kΩ ea.) Fail-Safe Operation? Yes No Yes Yes 7 Distributed by: Rhopoint Components www.rhopointcomponents.com email: [email protected] IL3522 Package Drawings, Dimensions and Specifications 0.3" 16-pin SOIC Package Dimensions in inches (mm) 0.287 (7.29) 0.300 (7.62) 0.013 (0.3) 0.020 (0.5) NOM 0.016 (0.4) 0.050 (1.3) 0.007 (0.2) 0.013 (0.3) 0.397 (10.08) 0.413 (10.50) 0.092 (2.34) 0.105 (2.67) Pin 1 identified by either an indent or a marked dot 0.08 (2.0) 0.10 (2.5) 0.040 (1.0) 0.060 (1.5) 0.394 (10.00) 0.419 (10.64) 0.004 (0.1) 0.012 (0.3) Ordering Information and Valid part Numbers IL 3522 E TR13 Bulk Packaging Blank = Tube TR13 = 13'' Tape and Reel Package Blank = 80/20 Tin/Lead Plating E = RoHS Compliant Valid Part Numbers IL3522 IL3522E IL3522TR13 IL3522E TR13 Base Part Number 3522 = RS-422 Transceiver Product Family IL = Isolators RoHS COMPLIANT 8 Distributed by: Rhopoint Components www.rhopointcomponents.com email: [email protected] IL3522 Revision History ISB-DS-001-IL3522-E September 2007 • Changed ordering information to reflect that devices are now fully RoHS compliant with no exemptions. ISB-DS-001-IL3522-D August 2007 • Reorganized specification tables ISB-DS-001-IL3522-C April 2007 • Eliminated soldering profile chart ISB-DS-001-IL3522-B • Specified “open” input condition in truth table • Added fail-safe biasing section. • Revised package drawing. ISB-DS-001-IL3522-A Initial Release 9 Distributed by: Rhopoint Components www.rhopointcomponents.com email: [email protected] IL3522 About NVE NVE is 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: [email protected] 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. Specifications shown are subject to change without notice. ISB-DS-001-IL3522-E September 2007 10 Distributed by: Rhopoint Components www.rhopointcomponents.com email: [email protected]