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| IL3285 IL3222 Fractional Load RS485 and RS422 Transceivers Functional Diagram Features * * * * * * * * * * * 3.3 V Input Supply Compatible 2500 VRMS Isolation (1 min) 40 ns Propagation Delay 5 ns Pulse Skew 20 kV/s Transient Immunity Thermal Shutdown Protection -40C to +85C Temperature Range 16 Pin SOIC Package UL1577 Approval Pending IEC 61010-1 Approval Pending +15 kV ESD Protection Applications * * * * * * High Node Count Networks Security Networks Building Environmental Controls Industrial Control Networks Gaming Systems Factory Automation Description Truth Table. VID (A-B) = 200 mV = -200 mV -7 Selection Table. Model Half / Full Duplex No. of devices allowed on bus Data Rate Mb/s Fail-safe IL3285 IL3222 half full 256 256 1 1 yes yes Isoloop(R) 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 (c) 2005 NVE Corporation IL3285 IL3222 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 ESD Protection IL3285 IL3222 Parameters Supply Voltage Input Voltage at any Bus Terminal (separately or common mode) High-Level Digital Input Current Low-Level Digital Input Current 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 Symbol TS TA VDD1, VDD2 Min. -65 -40 -7 -0.5 -0.5 -0.5 +15 +7 Min. 3.0 4.5 10 10 -10 -10 +12/-7 -60 8 60 8 85 10 Typ. Max. 150 100 12 7 VDD+0.5 VDD+1 Units C C V V V V kV kV Units V V mA mA mA mA V mA mA mA mA C s VDD1= 3.3 V VDD1= 5.0 V VDD1= 3.3 V VDD1= 5.0 V Test Conditions Recommended Operating Conditions Symbol VDD1 VDD2 VI VIC IIH IIH VID IOH IOH IOL IOL TA tIR,tIF Typ. Max. 5.5 5.5 12 -7 Test Conditions -8 -60 -8 -40 Insulation Specifications Parameters Creepage Distance (external) Barrier Impedance || pC Leakage Current Symbol Min. 8.077 Typ. >1014||7 0.2 Max. Units Test Conditions ARMS 240 VRMS, 60 Hz Safety & Approvals IEC61010-1 TUV Certificate Numbers: Approval Pending Classification as Table 1. Pollution Degree II Material Group III Max. Working Voltage 300 VRMS Package Type 16-SOIC (0.3") Model IL3285, IL3222 UL 1577 Rated 2500 VRMS for 1 minute Component Recognition program. File #: Approval Pending 2 NVE Corporation 11409 Valley View Road Eden Prairie, MN 55344-3617 USA Telephone: (952) 829-9217 Fax (952) 829-9189 Internet: www.isoloop.com IL3285 IL3222 Pin Connections 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 VDD1 GND1 R RE DE COIL D GND1 GND2 NC VDD2 A B NC GND2 VCOIL Input Power Supply Input Power Supply Ground Return Output Data from Bus Read Data Enable (if RE is high, R= high impedance) Drive Enable Supply voltage side of coils for DE and D Data Input to Bus Input Power Supply Ground Return Output Power Supply Ground Return No Internal Connection Output Power Supply Noninverting bus line Inverting bus line No Internal Connection Output Power Supply Ground Return Supply voltage side of coil for R IL3285 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 VDD1 GND1 R RE DE COIL D GND1 GND2 Y VDD2 Z B A GND2 VCOIL Input Power Supply Input Power Supply Ground Return Output Data from Bus Read Data Enable (if RE is high, R= high impedance) Drive Enable Supply voltage side of coils for DE and D Data Input to Bus Input Power Supply Ground Return Output Power Supply Ground Return Noninverting driver bus line Output Power Supply Inverting driver bus line Inverting receiver bus line Noninverting receiver bus line Output Power Supply Ground Return Supply voltage side of coil for R IL3222 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. 3 NVE Corporation 11409 Valley View Road Eden Prairie, MN 55344-3617 USA Telephone: (952) 829-9217 Fax (952) 829-9189 Internet: www.isoloop.com IL3285 IL3222 Driver Section Electrical Specifications are Tmin to Tmax unless otherwise stated. Parameters Symbol Min. Output voltage Differential Output Voltage |VOD1| Differential Output Voltage(6) VOD3 1.5 Change in Magnitude of (7) Differential |VOD| Output Voltage VOC Common Mode Output Voltage VOC Change in Magnitude of (7) Common |VOC| Mode Output Voltage Output Current(4) High Level Input Current Low Level Input Current |Short-circuit Output Current | Supply Current (VDD2 = +5V) Supply Current (VDD1 = +5V) (VDD2 = +3.3V) IIH IIL IOS IDD2 IDD1 IDD1 Symbol tD(OD) tSK(P) tT(OD) tPZH tPZL tPHZ tPLZ tSK(LIM) Typ. 2.3 Max. VDD VDD 5 0.2 3 0.2 1 -0.8 2 10 250 7 3 2 Max. 65 20 25 80 80 80 80 40 Units V V V V V V mA mA mA mA mA mA mA Units Mbps ns ns ns ns ns ns ns ns Test Conditions RL = 54 , CL = 50 pF RL = 54 , CL = 50 pF RL = 54 , CL = 50 pF RL = 54 , CL = 50 pF RL = 54 , CL = 50 pF RL = 54 , CL = 50 pF RL = 54 , CL = 50 pF RL = 54 , CL = 50 pF RL = 54 , CL = 50pF Test Conditions Io = 0 IO = 0 RL = 54 , VDD = 5 V RL = 54 or 100 RL = 54 or 100 RL = 54 or 100 Output Disabled, VO = 12 -7 V < VO <12 V No Load (Outputs Enabled) 60 4 2 1.4 Switching Specifications Min. Typ. 5 40 6 12 25 25 25 25 12 Parameters Maximum Data Rate Differential Output Prop Delay Pulse Skew(10) Differential Output Rise & Fall 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) Notes: These notes apply to both driver and receiver sections. All Voltage values are with respect to network ground except differential I/O bus voltages. Differential input/output voltage is measured at the noninverting terminal A with respect to the inverting terminal B. Skew limit is the maximum difference in any two channels in one device. 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 VDD!,VDD2 = 5 V or VDD!= 3.3 V and TA = 25C. 6. While -7 V 1. 2. 3. 4. 4 NVE Corporation 11409 Valley View Road Eden Prairie, MN 55344-3617 USA Telephone: (952) 829-9217 Fax (952) 829-9189 Internet: www.isoloop.com IL3285 IL3222 Receiver Section Electrical Specifications are Tmin to Tmax unless otherwise stated. Parameters Symbol Min. Positive-going Input Threshold VIT+ Voltage Negative-going Input Threshold VIT-0.2 Voltage Hysteresis Voltage (Vit+ - Vit-) VHYS High Level Digital Output Voltage Low Level Digital Output Voltage High-impedance-state output current Line Input Current(8) Input Resistance Supply Current (VDD2 = +5V) Supply Current (VDD1 = +5V) Supply Current (VDD1 = +3.3V) Parameters Maximum Data Rate Propagation Delay(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 Parameters Maximum Data Rate Propagation Delay(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 VOH VOL IOZ II 4 2 1.4 Switching Characteristics @ 5 V Symbol Min. Typ. 1 tPD 100 tSK(P) 4 rI IDD2 IDD1 IDD1 96 7 3 2 Max. 165 16 32 60 60 60 60 Max. 170 16 16 27 27 27 27 VDD - 0.2 Typ. Max. 0.2 Units V V 70 VDD 0.2 1 1 -0.8 mV V V A mA k mA mA mA Units Mbps ns ns ns ns ns ns ns Units Mbps ns ns ns ns ns ns ns Test Conditions RL = 54 , CL = 50 pF -1.5 VO 1.5 V, CL = 15 pF -1.5 VO 1.5 V, CL = 15 pF RL = 54 , CL = 50 pF CL = 15 pF CL = 15 pF CL = 15 pF CL = 15 pF Test Conditions RL = 54 , CL = 50 pF -1.5 VO 1.5 V, CL = 15 pF -1.5 VO 1.5 V, CL = 15 pF RL = 54 , CL = 50 pF CL = 15 pF CL = 15 pF CL = 15 pF CL = 15 pF Test Conditions -7 V < VCM < 12 V -7 V < VCM < 12 V VCM =0V, T=25C VID = 200 mV IOH = -20 mA VID = -200 mV IOL = 20mA VI = 12 V VI = -7 V 0.4 VO (VDD2 - 0.5) V tSK(LIM) 8 tPZH 15 tPZL 15 tPHZ 15 tPLZ 15 Switching Characteristics @ 3.3 V Symbol Min. Typ. 5 tPD 105 tSK(P) tSK(LIM) tPZH tPZL tPHZ tPLZ 4 8 17 17 17 17 5 NVE Corporation 11409 Valley View Road Eden Prairie, MN 55344-3617 USA Telephone: (952) 829-9217 Fax (952) 829-9189 Internet: www.isoloop.com IL3285 IL3222 Introduction The IL3000 family of isolated RS485 and RS422 transceivers are based on the revolutionary IL600 family of digital isolators. A single external resistor is used to set each input channel's maximum current for input voltages above 0.5 V. For additional information, view the IL600 Series data sheet. Operation The IL3000 series are current mode devices and utilize NVE's IL600 Series of digital isolators configured for noninverting outputs. The default state of each isolator output is the logic high state for zero coil current. Therefore, to switch the digital isolator output low, a logic low input signal voltage is applied to the input coil via a current limiting resistor. The resulting coil current switches the isolator output low which in turn is sent to the transceiver. See Figure 1 and Figure 2 below for typical coil connections. The absolute maximum current through the coil of the IL3000 series is 25 mA DC. However, it is important to limit input current to levels well below this in all applications. The worst case logic threshold current is 10 mA. While typical threshold currents are substantially less than this, NVE recommends designing a 10 mA logic threshold current in each application. Figure 3 shows the response of the IL3000 Series. The GMR bridge structure is designed such that the output of the isolator is logic high when no field signal is present. The output will switch to the low state with 10 mA of coil current and the output will switch back to the high state when the input current falls below 2 mA. This allows glitchfree interface with low slew rate signals. Figure 3. IL3000 Series Transfer Function Figure 1. Typical coil Connections for IL3285 To calculate the value of the protection resistor (R1) required, use Ohm's law as shown in the examples below. It should be noted that we are concerned only with the magnitude of the voltage across the coil. The absolute values of Vin High and Vin Low are arbitrary. Figure 2. Typical coil Connections for IL3222 Only a single resistor is required to limit the input coil to the recommended 10 mA. This allows a wide range of input voltages to be used since there is no semiconductor structure on the input. Figure 4. Series Resistor Calculation Equivalent Circuit. 6 NVE Corporation 11409 Valley View Road Eden Prairie, MN 55344-3617 USA Telephone: (952) 829-9217 Fax (952) 829-9189 Internet: www.isoloop.com IL3285 IL3222 Example 1. In this case, Tnom = 25C, Vin High is 5 V, Vin Low is 0 V, and Icoil minimum is specified as 10 mA. Total loop resistance is (Vin High - Vin Low) 5.0 = = 500 (R1 + Rcoil) = Icoil 0.01 Therefore, R1 = (500 - 55) = 445 Example 2. At a maximum operating temperature of 85C, Tmax = 85C, Tnom = 25C, Vin High = 5 V, Vin Low = 0 V, and nominal Rcoil = 55 . At Tmax = 85C Rcoil = 55 + ( Tmax - Tmin ) x TCRcoil DC Correctness The IL3000 Series of isolated transceivers are inherently DC stable 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 receiver in these devices feature a "fail-safe if open" function that guarantees a high level receiver output if the receiver inputs are unconnected (floating). IL3285 receiver outputs have tri-state capability via the active low RE input. Driver Features The driver is device delivers at least 1.5 V across a 54 load and features low propagation delay skew to maximize bit width and to minimize EMI. The drivers have tri-state capability via the active high DE input. Receiver Data Rate, Cables and Terminations This devices are 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. = 55 + (85 - 25) x 0.165 = 55 + 9.9 = 65 Therefore, the recommended series resistor is R1 = (VinHigh - VinLow) - Rcoil Icoil 5-0 = - 65 = 435 0.01 Allowance should also be made for the temperature coefficient of the current limiting resistor to ensure that Icoil is 10 mA at maximum operating temperature. Power Supplies It is recommended that 47 nF ceramic capacitors be used to decouple the power supplies. The capacitors must be placed as close as possible to VDD for proper operation. 7 NVE Corporation 11409 Valley View Road Eden Prairie, MN 55344-3617 USA Telephone: (952) 829-9217 Fax (952) 829-9189 Internet: www.isoloop.com IL3285 IL3222 Package Dimensions: 0.3'' 16- in SOIC Ordering Information and Valid part Numbers 8 NVE Corporation 11409 Valley View Road Eden Prairie, MN 55344-3617 USA Telephone: (952) 829-9217 Fax (952) 829-9189 Internet: www.isoloop.com IL3285 IL3222 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 952-8299217 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-IL3285/22-A January 26, 2005 9 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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