Hot Swappable, Dual I2C Isolators, 5 kV ADuM2250/ADuM2251 Data Sheet FEATURES GENERAL DESCRIPTION Bidirectional I2C communication Open-drain interfaces Suitable for hot swap applications 30 mA current sink capability 1000 kHz operation 3.0 V to 5.5 V supply/logic levels 16-lead SOIC wide body package version (RW-16) 16-lead SOIC wide body enhanced creepage version (RI-16-2) High temperature operation: 105°C Safety and regulatory approvals UL recognition: 5000 V rms for 1 minute per UL 1577 CSA Component Acceptance Notice 5A (RI-16-2 package) IEC 60601-1: 250 V rms (reinforced) IEC 60950-1: 400 V rms (reinforced) VDE certificate of conformity DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 VIORM = 849 V peak Qualified for automotive applications The ADuM2250/ADuM22511 are hot swappable digital isolators with nonlatching, bidirectional communication channels that are compatible with I2C interfaces. This eliminates the need for splitting I2C signals into separate transmit and receive signals for use with standalone optocouplers. APPLICATIONS Isolated I2C, SMBus, or PMBus interfaces Multilevel I2C interfaces Power supplies Networking Power over Ethernet The ADuM2250 provides two bidirectional channels, supporting a complete isolated I2C interface. The ADuM2251 provides one bidirectional channel and one unidirectional channel for those applications where a bidirectional clock is not required. The ADuM2250/ADuM2251 contain hot swap circuitry to prevent data glitches when an unpowered card is inserted onto an active bus. These isolators are based on iCoupler® chip scale transformer technology from Analog Devices, Inc. iCoupler is a magnetic isolation technology with performance, size, power consumption, and functional advantages compared to optocouplers. The ADuM2250/ADuM2251 integrate iCoupler channels with semiconductor circuitry to enable a complete, isolated I2C interface in a small form factor package. FUNCTIONAL BLOCK DIAGRAMS NC 2 15 NC VDD1 3 NC 2 14 VDD2 NC 4 DECODE ENCODE 13 NC SDA1 5 ENCODE DECODE 12 SDA2 SCL1 6 DECODE ENCODE 11 SCL2 GND1 7 ENCODE DECODE 10 NC NC 8 9 NC = NO CONNECT GND2 15 NC VDD1 3 14 VDD2 NC 4 DECODE ENCODE 13 NC SDA1 5 ENCODE DECODE 12 SDA2 SCL1 6 ENCODE DECODE 11 SCL2 GND1 7 Figure 1. ADuM2250 Functional Block Diagram 1 16 GND2 ADuM2251 10 NC NC 8 9 NC = NO CONNECT GND2 06670-002 GND1 1 16 GND2 ADuM2250 06670-001 GND1 1 Figure 2. ADuM2251 Functional Block Diagram Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329; other patents pending. Rev. D Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2007–2015 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com ADuM2250/ADuM2251 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Absolute Maximum Ratings ............................................................7 Applications ....................................................................................... 1 ESD Caution...................................................................................7 General Description ......................................................................... 1 Pin Configuration and Function Descriptions..............................8 Functional Block Diagrams ............................................................. 1 Test Conditions ..................................................................................9 Revision History ............................................................................... 2 Applications Information .............................................................. 10 Specifications..................................................................................... 3 Functional Description .............................................................. 10 Electrical Characteristics ............................................................. 3 Startup .......................................................................................... 11 Package Characteristics ............................................................... 5 Capacitive Load at Low Speeds ................................................ 11 Regulatory Information ............................................................... 5 Magnetic Field Immunity.......................................................... 12 Insulation and Safety Related Specifications ............................ 5 Outline Dimensions ....................................................................... 13 DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 Insulation Characteristics ................................................................................ 6 Ordering Guide .......................................................................... 14 Automotive Products ................................................................. 14 Recommended Operating Conditions ...................................... 6 REVISION HISTORY 7/15—Rev. C to Rev. D Changes to Table 4 and Table 5 ....................................................... 5 Changes to Ordering Guide .......................................................... 14 4/14—Rev. B to Rev. C Changes to Features Section............................................................ 1 Added Capacitive Load at Low Speeds Section .......................... 11 Changes to Ordering Guide .......................................................... 14 Added Automotive Products Section .......................................... 14 9/11—Rev. 0 to Rev. A Added 16-Lead SOIC ......................................................... Universal Changes to Features Section and Endnote 1 ..................................1 Changes to Table 4 and Table 5 .......................................................6 Changes to Endnote 1 in Table 7 .....................................................7 Changes to Functional Description Section and Figure 7 ........ 10 Updated Outline Dimensions ....................................................... 13 Changes to Ordering Guide .......................................................... 13 4/07—Revision 0: Initial Version 3/13—Rev. A to Rev. B Created Hyperlink for Safety and Regulatory Approvals Entry in Features Section................................................................. 1 Changes to Features Section............................................................ 1 Changes to Table 4 ............................................................................ 5 Changes to DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 Section and Table 6 ........................... 6 Reformatted Table 8 ......................................................................... 7 Changes to Figure 4, Table 9, and Table 10 ................................... 8 Moved Test Conditions Section ...................................................... 9 Changes to Functional Description Section ............................... 10 Changes to Captions of Figure 8 and Figure 9 ............................ 11 Rev. D | Page 2 of 16 Data Sheet ADuM2250/ADuM2251 SPECIFICATIONS ELECTRICAL CHARACTERISTICS DC Specifications All voltages are relative to their respective grounds. All minimum/maximum specifications apply over the entire recommended operating range, unless otherwise noted. All typical specifications are at TA = 25°C, VDD1 = 5 V, and VDD2 = 5 V, unless otherwise noted. Table 1. Parameter Symbol Min Typ Max Unit Test Conditions/Comments IDD1 IDD2 IDD1 IDD2 2.8 2.7 1.9 1.7 5.0 5.0 3.0 3.0 mA mA mA mA VDD1 = 5 V VDD2 = 5 V VDD1 = 3.3 V VDD2 = 3.3 V IDD1 IDD2 IDD1 IDD2 IISDA1, IISDA2, IISCL1, IISCL2 2.8 2.5 1.8 1.6 0.01 6.0 4.7 3.0 2.8 10 mA mA mA mA µA VDD1 = 5 V VDD2 = 5 V VDD1 = 3.3 V VDD2 = 3.3 V VSDA1 = VDD1, VSDA2 = VDD2, VSCL1 = VDD1, VSCL2 = VDD2 700 900 850 mV mV mV mV 0.3 × VDD2 V V mV ADuM2250 Input Supply Current, Side 1, 5 V Input Supply Current, Side 2, 5 V Input Supply Current, Side 1, 3.3 V Input Supply Current, Side 2, 3.3 V ADuM2251 Input Supply Current, Side 1, 5 V Input Supply Current, Side 2, 5 V Input Supply Current, Side 1, 3.3 V Input Supply Current, Side 2, 3.3 V LEAKAGE CURRENTS SIDE 1 LOGIC LEVELS Logic Input Threshold 1 Logic Low Output Voltage Input/Output Logic Low Level Difference 2 SIDE 2 LOGIC LEVELS Logic Low Input Voltage Logic High Input Voltage Logic Low Output Voltage 1 2 VSDA1IL, VSCL1IL VSDA1OL, VSCL1OL ΔVSDA1, ΔVSCL1 VSDA2IL, VSCL2IL VSDA2IH, VSCL2IH VSDA2OL, VSCL2OL 500 600 600 50 0.7 × VDD2 400 ISDA1 = ISCL1 = 3.0 mA ISDA1 = ISCL1 = 0.5 mA ISDA2 = ISCL2 = 30 mA VIL < 0.5 V, VIH > 0.7 V. ΔVS1 = VS1OL − VS1IL. This is the minimum difference between the output logic low level and the input logic low threshold within a given component. This ensures that there is no possibility of the part latching up the bus to which it is connected. Rev. D | Page 3 of 16 ADuM2250/ADuM2251 Data Sheet AC Specifications All voltages are relative to their respective grounds. All minimum/maximum specifications apply over the entire recommended operating range, unless otherwise noted. All typical specifications are at TA = 25°C, VDD1 = 5 V, and VDD2 = 5 V, unless otherwise noted. See Figure 5 for a timing test diagram. Table 2. Parameter MAXIMUM FREQUENCY OUTPUT FALL TIME 5 V Operation Symbol tf1 tf2 Side 1 Output (0.9 VDD1 to 0.9 V) Side 2 Output (0.9 VDD2 to 0.1 VDD2) PROPAGATION DELAY 5 V Operation tf1 tf2 Max Unit kHz Test Conditions/Comments 13 32 26 52 120 120 ns ns 3.0 V ≤ VDD1, VDD2 ≤ 3.6 V, CL1 = 40 pF, R1 = 1.0 kΩ, CL2 = 400 pF, R2 = 120 Ω 13 32 32 61 120 120 ns ns 4.5 V ≤ VDD1, VDD2 ≤ 5.5 V, CL1 = CL2 = 0 pF, R1 = 1.6 kΩ, R2 = 180 Ω Side 1 to Side 2, Rising Edge 1 Side 1 to Side 2, Falling Edge 2 Side 2 to Side 1, Rising Edge 3 Side 2 to Side 1, Falling Edge 4 3 V Operation tPLH12 tPHL12 tPLH21 tPHL21 Side 1 to Side 2, Rising Edge1 Side 1 to Side 2, Falling Edge2 Side 2 to Side 1, Rising Edge3 Side 2 to Side 1, Falling Edge4 PULSE WIDTH DISTORTION 5 V Operation tPLH12 tPHL12 tPLH21 tPHL21 Side 1 to Side 2, |tPLH12 − tPHL12| Side 2 to Side 1, |tPLH21 − tPHL21| COMMON-MODE TRANSIENT IMMUNITY 5 Typ 4.5 V ≤ VDD1, VDD2 ≤ 5.5 V, CL1 = 40 pF, R1 = 1.6 kΩ, CL2 = 400 pF, R2 = 180 Ω Side 1 Output (0.9 VDD1 to 0.9 V) Side 2 Output (0.9 VDD2 to 0.1 VDD2) 3 V Operation Side 1 to Side 2, |tPLH12 − tPHL12| Side 2 to Side 1, |tPLH21 − tPHL21| 3 V Operation Min 1000 95 162 31 85 130 275 70 155 ns ns ns ns 3.0 V ≤ VDD1, VDD2 ≤ 3.6 V, CL1 = CL2 = 0 pF, R1 = 1.0 kΩ, R2 = 120 Ω 82 196 32 110 125 340 75 210 ns ns ns ns 4.5 V ≤ VDD1, VDD2 ≤ 5.5 V, CL1 = CL2 = 0 pF, R1 = 1.6 kΩ, R2 = 180 Ω PWD12 PWD21 67 54 145 85 ns ns 3.0 V ≤ VDD1, VDD2 ≤ 3.6 V, CL1 = CL2 = 0 pF, R1 = 1.0 kΩ, R2 = 120 Ω PWD12 PWD21 |CMH|, |CML| 25 114 77 35 215 135 ns ns kV/µs tPLH12 propagation delay is measured from the Side 1 input logic threshold to an output value of 0.7 VDD2. tPHL12 propagation delay is measured from the Side 1 input logic threshold to an output value of 0.4 V. 3 tPLH21 propagation delay is measured from the Side 2 input logic threshold to an output value of 0.7 VDD1. 4 tPHL21 propagation delay is measured from the Side 2 input logic threshold to an output value of 0.9 V. 5 CMH is the maximum common-mode voltage slew rate that can be sustained while maintaining VO > 0.8 VDD2. CML is the maximum common-mode voltage slew rate that can be sustained while maintaining VO < 0.8 V. The common-mode voltage slew rates apply to both rising and falling common-mode voltage edges. The transient magnitude is the range over which the common mode is slewed. 1 2 Rev. D | Page 4 of 16 Data Sheet ADuM2250/ADuM2251 PACKAGE CHARACTERISTICS Table 3. Parameter Resistance (Input to Output)1 Capacitance (Input to Output)1 Input Capacitance IC Junction to Ambient Thermal Resistance 1 Symbol RI-O CI-O CI θJA Min Typ 1012 2.2 4.0 45 Max Unit Ω pF pF °C/W Test Conditions/Comments f = 1 MHz Thermocouple located at center of package underside The device is considered a 2-terminal device; Pin 1 through Pin 8 are shorted together, and Pin 9 through Pin 16 are shorted together. REGULATORY INFORMATION The ADuM2250/ADuM2251 are approved by the organizations listed in Table 4. Table 4. UL Recognized Under UL 1577 Component Recognition Program1 Single Protection, 5000 V rms Isolation Voltage File E214100 1 2 CSA Approved under CSA Component Acceptance Notice 5A CQC Approved under CQC11-471543-2012 Basic insulation per CSA 60950-1-07 and IEC 60950-1, 600 V rms (849 V peak) maximum working voltage RW-16 package: reinforced insulation per CSA 60950-1-07 and IEC 60950-1, 380 V rms (537 V peak) maximum working voltage Reinforced insulation per IEC 60601-1, 125 V rms (176 V peak) maximum working voltage RI-16-2 package: reinforced insulation per CSA 60950-1-07 and IEC 60950-1, 400 V rms (565 V peak) maximum working voltage Reinforced insulation per IEC 60601-1, 250 V rms (353 V peak) maximum working voltage File 205078 Basic insulation per GB4943.1-2011, 600 V rms (848 V peak) maximum working voltage, tropical climate, altitude ≤ 5000 m RW-16 package: reinforced insulation per GB4943.1-2011, 380 V rms (537 V peak) maximum working voltage, tropical climate, altitude ≤ 5000 m VDE Certified according to DIN V VDE V 0884-10 (VDE V 0884-10):2006-122 Reinforced insulation, 849 V peak RI-16 package: reinforced insulation per 400 V rms (565 V peak) maximum working voltage, tropical climate, altitude ≤ 5000 m File CQC14001117251 File 2471900-4880-0001 In accordance with UL 1577, each ADuM2250/ADuM2251 is proof tested by applying an insulation test voltage ≥ 6000 V rms for 1 sec (current leakage detection limit = 10 μA). In accordance with DIN V VDE V 0884-10 (VDE V 0884-10):2006-12, each ADuM2250/ADuM2251 is proof tested by applying an insulation test voltage ≥ 1590 V peak for 1 sec (partial discharge detection limit = 5 pC). The asterisk (*) marking branded on the component designates DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 approval. INSULATION AND SAFETY RELATED SPECIFICATIONS Table 5. Parameter Rated Dielectric Insulation Voltage Minimum External Air Gap (Clearance) Symbol Minimum External Tracking (Creepage) L(I02) RW-16 Package RI-16-2 Package Minimum Internal Distance (Internal Clearance) Tracking Resistance (Comparative Tracking Index) Isolation Group L(I01) CTI Value 5000 8.0 min Unit V rms mm 7.7 min 8.3 min 0.017 min >400 II mm mm mm V Rev. D | Page 5 of 16 Test Conditions/Comments 1-minute duration Distance measured from input terminals to output terminals, shortest distance through air along the PCB mounting plane, as an aid to PC board layout Measured from input terminals to output terminals, shortest distance path along body Insulation distance through insulation DIN IEC 112/VDE 0303, Part 1 Material Group (DIN VDE 0110, 1/89, Table 1) ADuM2250/ADuM2251 Data Sheet DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 INSULATION CHARACTERISTICS These isolators are suitable for reinforced isolation only within the safety limit data. Maintenance of the safety data is ensured by protective circuits. The asterisk (*) marking branded on the component designates DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 approval for an 849 V peak working voltage. Table 6. Description Installation Classification per DIN VDE 0110 For Rated Mains Voltage ≤ 300 V rms For Rated Mains Voltage ≤ 450 V rms For Rated Mains Voltage ≤ 600 V rms Climatic Classification Pollution Degree per DIN VDE 0110, Table 1 Maximum Working Insulation Voltage Input to Output Test Voltage, Method b1 Input to Output Test Voltage, Method a After Environmental Tests Subgroup 1 After Input and/or Safety Tests Subgroup 2 and Subgroup 3 Highest Allowable Overvoltage Safety Limiting Values Case Temperature Supply Current Insulation Resistance at TS Test Conditions/Comments VIORM × 1.875 = VPR, 100% production test, tm = 1 sec, partial discharge < 5 pC Unit VIORM VPR I to IV I to II I to II 40/105/21 2 849 1592 V peak V peak 1358 1018 V peak V peak VTR 6000 V peak TS IS RS 150 555 >109 °C mA Ω VPR Transient overvoltage, tTR = 10 sec Maximum value allowed in the event of a failure (see Figure 3) IDD1 + IDD2 VIO = 500 V RECOMMENDED OPERATING CONDITIONS 600 Table 7. Parameter Operating Temperature Supply Voltages 1 Input/Output Signal Voltage Capacitive Load Side 1 Side 2 Static Output Loading Side 1 Side 2 500 400 300 200 100 0 50 100 150 AMBIENT TEMPERATURE (°C) 200 06670-003 SAFE OPERATING VDD1 CURRENT (mA) Characteristic VIORM × 1.6 = VPR, tm = 60 sec, partial discharge < 5 pC VIORM × 1.2 = VPR, tm = 60 sec, partial discharge < 5 pC Thermal Derating Curve 0 Symbol 1 Symbol TA VDD1, VDD2 VSDA1, VSCL1, VSDA2, VSCL2 Min −40 3.0 CL1 CL2 ISDA1, ISCL1 ISDA2, ISCL2 0.5 0.5 All voltages are relative to their respective grounds. Figure 3. Thermal Derating Curve, Dependence of Safety Limiting Values on Case Temperature, per DIN V VDE V 0884-10 Rev. D | Page 6 of 16 Max +105 5.5 5.5 Unit °C V V 40 400 pF pF 3 30 mA mA Data Sheet ADuM2250/ADuM2251 ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise noted. Stresses at or above those listed under Absolute Maximum Ratings may cause permanent damage to the product. This is a stress rating only; functional operation of the product at these or any other conditions above those indicated in the operational section of this specification is not implied. Operation beyond the maximum operating conditions for extended periods may affect product reliability. Table 8. Parameter Storage Temperature (TST) Ambient Operating Temperature (TA) Supply Voltages (VDD1, VDD2) 1 Input/Output Voltage Side 1 (VSDA1, VSCL1)1 Side 2 (VSDA2, VSCL2)1 Average Output Current per Pin 2 Side 1 (IO1) Side 2 (IO2) Common-Mode Transients 3 Rating −65°C to +150°C −40°C to +105°C −0.5 V to +7.0 V ESD CAUTION −0.5 V to VDD1 + 0.5 V −0.5 V to VDD2 + 0.5 V ±18 mA ±100 mA −100 kV/µs to +100 kV/µs All voltages are relative to their respective grounds. See Figure 3 for maximum rated current values for various temperatures. 3 Refers to common-mode transients across the insulation barrier. Commonmode transients exceeding the absolute maximum rating may cause latch-up or permanent damage. 1 2 Rev. D | Page 7 of 16 ADuM2250/ADuM2251 Data Sheet PIN CONFIGURATION AND FUNCTION DESCRIPTIONS 16 GND2 GND1 1 15 NC NC 2 VDD1 3 NC 4 SDA1 5 SCL1 6 GND1 7 ADuM2250/ ADuM2251 TOP VIEW (Not to Scale) 14 VDD2 13 NC 12 SDA2 11 SCL2 10 NC NC 8 9 GND2 06670-004 NC = NO CONNECT NOTES 1. PIN 1 AND PIN 7 ARE INTERNALLY CONNECTED TO EACH OTHER, AND IT IS RECOMMENDED THAT BOTH PINS BE CONNECTED TO A COMMON GROUND. 2. PIN 9 AND PIN 16 ARE INTERNALLY CONNECTED TO EACH OTHER, AND IT IS RECOMMENDED THAT BOTH PINS BE CONNECTED TO A COMMON GROUND. Figure 4. Pin Configuration Table 9. ADuM2250 Pin Function Descriptions Pin No. 1, 7 Mnemonic GND1 2, 4, 8, 10, 13, 15 3 5 6 9, 16 NC 11 12 14 SCL2 SDA2 VDD2 VDD1 SDA1 SCL1 GND2 Description Ground 1. Ground reference for Isolator Side 1. Pin 1 and Pin 7 are internally connected to each other, and it is recommended that both pins be connected to a common ground. No Connect. Supply Voltage, 3.0 V to 5.5 V. Data Input/Output, Side 1. Clock Input/Output, Side 1. Ground 2. Isolated ground reference for Isolator Side 2. Pin 9 and Pin 16 are internally connected to each other, and it is recommended that both pins be connected to a common ground. Clock Input/Output, Side 2. Data Input/Output, Side 2. Supply Voltage, 3.0 V to 5.5 V. Table 10. ADuM2251 Pin Function Descriptions Pin No. 1, 7 Mnemonic GND1 2, 4, 8, 10, 13, 15 3 5 6 9, 16 NC 11 12 14 SCL2 SDA2 VDD2 VDD1 SDA1 SCL1 GND2 Description Ground 1. Ground reference for Isolator Side 1. Pin 1 and Pin 7 are internally connected to each other, and it is recommended that both pins be connected to a common ground. No Connect. Supply Voltage, 3.0 V to 5.5 V. Data Input/Output, Side 1. Clock Input, Side 1. Ground 2. Isolated ground reference for Isolator Side 2. Pin 9 and Pin 16 are internally connected to each other, and it is recommended that both pins be connected to a common ground. Clock Output, Side 2. Data Input/Output, Side 2. Supply Voltage, 3.0 V to 5.5 V. Rev. D | Page 8 of 16 Data Sheet ADuM2250/ADuM2251 TEST CONDITIONS NC VDD1 R1 R1 NC SDA1 SCL1 CL1 CL1 GND1 NC 16 1 2 ADuM2250 15 14 3 4 DECODE ENCODE 13 5 ENCODE DECODE 12 6 DECODE ENCODE 11 7 ENCODE DECODE 10 9 8 NC = NO CONNECT Figure 5. Timing Test Diagram Rev. D | Page 9 of 16 GND2 NC VDD2 NC R2 R2 CL2 CL2 SDA2 SCL2 NC GND2 06670-005 GND1 ADuM2250/ADuM2251 Data Sheet APPLICATIONS INFORMATION The ADuM2250/ADuM2251 interface on each side to I C signals. Internally, the bidirectional I2C signals are split into two unidirectional channels communicating in opposite directions via dedicated iCoupler isolation channels. One channel of each pair (the Side 1 input of each input/output pin in Figure 6) implements a special input buffer and output driver that can differentiate between externally generated inputs and its own output signals. It transfers only externally generated input signals to the corresponding Side 2 data or clock pin. Both the Side 1 and Side 2 I2C pins are designed to interface to an I2C bus operating in the 3.0 V to 5.5 V range. A logic low on either side causes the corresponding input/output pin across the coupler to be pulled low enough to comply with the logic low threshold requirements of other I2C devices on the bus. Bus contention and latch-up are avoided by guaranteeing that the input low threshold at SDA1 or SCL1 is at least 50 mV less than the output low signal at the same pin. This prevents an output logic low at Side 1 from being transmitted back to Side 2 and pulling down the I2C bus by latching the state. Because the Side 2 logic levels/thresholds and drive capabilities comply fully with standard I2C values, multiple ADuM2250/ ADuM2251 devices connected to a bus by their Side 2 pins can communicate with each other and with other I2C-compatible devices, as shown in Figure 7. Note the distinction between I2C compatibility and I2C compliance. I2C compatibility refers to situations in which the logic levels or drive capability of a component do not necessarily meet the requirements of the I2C specification but still allow the component to communicate with an I2C-compliant device. I2C compliance refers to situations in which the logic levels and drive capability of a component fully meet the requirements of the I2C specification. Because the Side 1 pin has a modified output level/input threshold, Side 1 of the ADuM2250/ADuM2251 can communicate only with devices that are fully compliant with the I2C standard. In other words, Side 2 of the ADuM2250/ADuM2251 is I2C-compliant, whereas Side 1 is only I2C-compatible. The Side 1 input/output pins must not be connected to other I2C buffers that implement a similar scheme of dual input/output threshold detection. This latch-up prevention scheme is implemented in several popular I2C level shifting and bus extension products currently available from Analog Devices and other manufacturers. Care should be taken to review the data sheet of potential I2C bus buffering products to ensure that only one buffer on a bus segment implements a dual threshold scheme. A bus segment is a portion of the I2C bus that is isolated from other portions of the bus by galvanic isolation, bus extenders, or level shifting buffers. Table 11 shows how multiple ADuM2250/ ADuM2251 components can coexist on a bus as long as two Side 1 buffers are not connected to the same bus segment. Table 11. ADuM2250/ADuM2251 Buffer Compatibility Side 1 No Yes Side 1 Side 2 Side 2 Yes Yes The output logic low levels are independent of the VDD1 and VDD2 voltages. The input logic low threshold at Side 1 is also independent of VDD1. However, the input logic low threshold at Side 2 is designed to be at 0.3 VDD2, consistent with I2C requirements. The Side 1 and Side 2 input/output pins have opencollector outputs whose high levels are set via pull-up resistors to their respective supply voltages. GND1 NC VDD1 NC SDA1 SCL1 GND1 NC 1 2 16 ADuM2250 15 14 3 4 DECODE ENCODE 13 5 ENCODE DECODE 12 6 DECODE ENCODE 11 7 ENCODE DECODE 10 8 9 GND2 NC VDD2 NC SDA2 SCL2 NC GND2 SYMBOL INDICATES A DUAL THRESHOLD INPUT BUFFER. NC = NO CONNECT Figure 6. ADuM2250 Block Diagram Figure 7 shows a typical application circuit, including the pull-up resistors required for both Side 1 and Side 2 buses. Bypass capacitors with values from 0.01 μF to 0.1 μF are required between VDD1 and GND1 and between VDD2 and GND2. The 200 Ω resistor shown in Figure 7 is required for latch-up immunity if the ambient temperature can be between 105°C and 125°C. I2C BUS 1 MICROPROCESSOR OR SECONDARY BUS SEGMENT OPTIONAL 200Ω VDD1 SDA1 SCL 1 GND1 2 16 ADuM2250 15 3 14 4 13 5 12 6 11 7 10 8 9 VDD2 SDA2 SCL2 GND2 Figure 7. Typical Isolated I2C Interface Using the ADuM2250 Rev. D | Page 10 of 16 06670-007 2 06670-006 FUNCTIONAL DESCRIPTION Data Sheet ADuM2250/ADuM2251 STARTUP MINIMUM RECOMMENDED OPERATING SUPPLY, 3.0V INTERNAL START-UP THRESHOLD, 2.0V For the signal channels to be enabled, the following criteria must be met: • • Both supplies must be at least 2.5 V. At least 40 μs must elapse after both supplies exceed the internal start-up threshold of 2.0 V. 40µs Figure 9. Start-Up Condition, Supply Slew Rate < 12.5 V/ms CAPACITIVE LOAD AT LOW SPEEDS Until both criteria are met for both supplies, the ADuM2250/ ADuM2251 outputs are pulled high, thereby ensuring a startup that avoids any disturbances on the bus. Figure 8 and Figure 9 illustrate the supply conditions for fast and slow input supply slew rates. MINIMUM RECOMMENDED OPERATING SUPPLY, 3.0V SUPPLY VALID MINIMUM VALID SUPPLY, 2.5V 40µs The ADuM2250/ADuM2251 are designed for operation at speeds up to 1 Mbps. Due to the limited current available on Side 1 operation at 1 Mbps limits the capacitance that can be driven at the minimum pull-up value to 40 pF. Most applications operate at 100 kbps in standard mode or 400 kbps in fast mode. At these lower operating speeds, the limitation on the load capacitance can be significantly relaxed. Table 12 shows the maximum capacitance at minimum pull-up values for standard and fast operating modes. If larger values for the pull-up resistor are used, the maximum supported capacitance must be scaled down proportionately so that the rise time does not increase beyond the values required by the standard. 06670-008 INTERNAL START-UP THRESHOLD, 2.0V SUPPLY VALID MINIMUM VALID SUPPLY, 2.5V 06670-009 Both the VDD1 and VDD2 supplies have an undervoltage lockout feature that prevents the signal channels from operating unless certain criteria are met. This feature prevents the possibility of input logic low signals pulling down the I2C bus inadvertently during power-up/power-down. Figure 8. Start-Up Condition, Supply Slew Rate > 12.5 V/ms Table 12. Side 1 Maximum Load Conditions Mode Standard Fast Standard Fast VDD1 5 5 3.3 3.3 Data Rate (kbps) 100 400 100 400 Maximum Capacitive Load for Side 1 tr (ns) tf (ns) 1000 187 300 172 1000 270 300 235 Rev. D | Page 11 of 16 R1 (Ω) 1600 1600 1000 1000 CL1 (pF) 484 120 771 188 ADuM2250/ADuM2251 Data Sheet The pulses at the transformer output have an amplitude greater than 1.0 V. The decoder has a sensing threshold at approximately 0.5 V, thus establishing a 0.5 V margin in which induced voltages can be tolerated. The voltage induced across the receiving coil is given by V = (−dβ/dt) ∑ πrn2; n = 1, 2, … , N where: β is the magnetic flux density (gauss). rn is the radius of the nth turn in the receiving coil (cm). N is the number of turns in the receiving coil. Given the geometry of the receiving coil in the ADuM2250/ ADuM2251 and an imposed requirement that the induced voltage be, at most, 50% of the 0.5 V margin at the decoder, a maximum allowable magnetic field is calculated, as shown in Figure 10. MAXIMUM ALLOWABLE MAGNETIC FLUX DENSITY (kgauss) 100 10 1 0.1 The preceding magnetic flux density values correspond to specific current magnitudes at given distances away from the ADuM2250/ADuM2251 transformers. Figure 11 expresses these allowable current magnitudes as a function of frequency for selected distances. As shown in Figure 11, the ADuM2250/ ADuM2251 are extremely immune and can be affected only by extremely large currents operated at high frequency very close to the component. For the 1 MHz example, a 0.5 kA current must be placed 5 mm away from the ADuM2250/ADuM2251 to affect the operation of the component. Note that at combinations of strong magnetic fields and high frequencies, any loops formed by printed circuit board traces can induce error voltages sufficiently large to trigger the thresholds of succeeding circuitry. Exercise care in the layout of such traces to avoid this possibility. 1000 100 10 DISTANCE = 100mm 1 DISTANCE = 5mm 0.1 0.01 0.01 1k 10k 100k 1M 10M MAGNETIC FIELD FREQUENCY (Hz) 10k 1M 10M 100k MAGNETIC FIELD FREQUENCY (Hz) 100M 06670-010 0.001 1k DISTANCE = 1m Figure 10. Maximum Allowable External Magnetic Flux Density Rev. D | Page 12 of 16 Figure 11. Maximum Allowable Current for Various Current-to-ADuM2250/ADuM2251 Spacings 100M 06670-011 The ADuM2250/ADuM2251 are extremely immune to external magnetic fields. The limitation on the magnetic field immunity of the ADuM2250/ADuM2251 is set by the condition in which induced voltage in the receiving coil of the transformer is sufficiently large to either falsely set or reset the decoder. The following analysis defines the conditions under which this may occur. The 3 V operating condition of the ADuM2250/ADuM2251 is examined because it represents the most susceptible mode of operation. For example, at a magnetic field frequency of 1 MHz, the maximum allowable magnetic field of 0.2 kgauss induces a voltage of 0.25 V at the receiving coil. This voltage is approximately 50% of the sensing threshold and does not cause a faulty output transition. Similarly, if such an event occurs during a transmitted pulse (and is of the worst-case polarity), it reduces the received pulse from >1.0 V to 0.75 V—still well above the 0.5 V sensing threshold of the decoder. MAXIMUM ALLOWABLE CURRENT (kA) MAGNETIC FIELD IMMUNITY Data Sheet ADuM2250/ADuM2251 OUTLINE DIMENSIONS 10.50 (0.4134) 10.10 (0.3976) 9 16 7.60 (0.2992) 7.40 (0.2913) 1 8 1.27 (0.0500) BSC 0.75 (0.0295) 45° 0.25 (0.0098) 2.65 (0.1043) 2.35 (0.0925) 0.30 (0.0118) 0.10 (0.0039) COPLANARITY 0.10 10.65 (0.4193) 10.00 (0.3937) SEATING PLANE 0.51 (0.0201) 0.31 (0.0122) 8° 0° 1.27 (0.0500) 0.40 (0.0157) 0.33 (0.0130) 0.20 (0.0079) 03-27-2007-B COMPLIANT TO JEDEC STANDARDS MS-013-AA CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. Figure 12. 16-Lead Standard Small Outline Package [SOIC_W] Wide Body (RW-16) Dimensions shown in millimeters (inches) 12.85 12.75 12.65 1.93 REF 16 9 PIN 1 MARK 1 8 10.51 10.31 10.11 2.64 2.54 2.44 2.44 2.24 0.30 0.20 0.10 COPLANARITY 0.1 1.27 BSC 0.46 0.36 0.71 0.50 0.31 0.25 BSC GAGE PLANE SEATING PLANE 45° 1.01 0.76 0.51 COMPLIANT TO JEDEC STANDARDS MS-013-AC Figure 13. 16-Lead Standard Small Outline Package, with Increased Creepage [SOIC_IC] Wide Body (RI-16-2) Dimensions shown in millimeters Rev. D | Page 13 of 16 0.32 0.23 8° 0° 11-15-2011-A 7.60 7.50 7.40 ADuM2250/ADuM2251 Data Sheet ORDERING GUIDE Model 1, 2 ADuM2250ARWZ ADuM2250ARWZ-RL ADuM2250WARWZ ADuM2250WARWZ-RL ADuM2250ARIZ ADuM2250ARIZ-RL ADuM2251ARWZ ADuM2251ARWZ-RL ADuM2251WARWZ ADuM2251WARWZ-RL ADuM2251ARIZ ADuM2251ARIZ-RL 1 2 Number of Inputs, VDD1 Side 2 2 2 2 2 2 2 2 2 2 2 2 Number of Inputs, VDD2 Side 2 2 2 2 2 2 1 1 1 1 1 1 Maximum Data Rate (Mbps) 1 1 1 1 1 1 1 1 1 1 1 1 Temperature Range −40°C to +105°C −40°C to +105°C −40°C to +125°C −40°C to +125°C −40°C to +105°C −40°C to +105°C −40°C to +105°C −40°C to +105°C −40°C to +125°C −40°C to +125°C −40°C to +105°C −40°C to +105°C Package Description 16-Lead SOIC_W 16-Lead SOIC_W, 13” Tape and Reel 16-Lead SOIC_W 16-Lead SOIC_W, 13” Tape and Reel 16-Lead SOIC_IC 16-Lead SOIC_IC, 13” Tape and Reel 16-Lead SOIC_W 16-Lead SOIC_W, 13” Tape and Reel 16-Lead SOIC_W 16-Lead SOIC_W, 13” Tape and Reel 16-Lead SOIC_IC 16-Lead SOIC_IC, 13” Tape and Reel Package Option RW-16 RW-16 RW-16 RW-16 RI-16-2 RI-16-2 RW-16 RW-16 RW-16 RW-16 RI-16-2 RI-16-2 Z = RoHS Compliant Part. W = Qualified for Automotive Applications. AUTOMOTIVE PRODUCTS The ADuM2250W and ADuM2251W models are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. Note that these automotive model may have specifications that differ from the commercial model; therefore, designers should review the Specifications section of this data sheet carefully. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for these models. Rev. D | Page 14 of 16 Data Sheet ADuM2250/ADuM2251 NOTES Rev. D | Page 15 of 16 ADuM2250/ADuM2251 Data Sheet NOTES I2C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors). ©2007–2015 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06670-0-7/15(D) Rev. D | Page 16 of 16