Hot-Swappable Dual Isolators ADuM1250/ADuM1251 GENERAL DESCRIPTIO
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Bi-directional Communication Open-drain interfaces Suitable hot-swap applications current sink capability 1000 Operation 5.5V Supply/Logic Levels Narrow body SOIC 8-lead package High temperature operation: 105°C Safety regulatory approvals (pending) recognition 2500 minute 1577 component acceptance notice certificate conformity 60747-5-2 (VDE 0884 Part 2003-01 60950 (VDE 0805): 2001-12; 60950: 2000 VIORM peak
Hot-Swappable Dual Isolators ADuM1250/ADuM1251
GENERAL DESCRIPTION
ADuM1250/ADuM12511 hot-swappable digital isolators having non-latching bi-directional communication channels compatible with interfaces. This eliminates need splitting signals into separate transmit receive signals with stand-alone optocouplers. ADuM1250 provides bi-directional channels supporting complete isolated interface. ADuM1251 provides bi-directional channel uni-directional channel those applications which bi-directional clock required. Both ADuM1250 ADuM1251 contain hot-swap circuitry prevent glitching data when unpowered card inserted onto active (see Application Information more details). These isolators based Analog Devices' iCoupler® chipscale transformer technology. iCoupler magnetic isolation technology with functional, performance, size, power consumption advantages compared optocouplers. With ADuM1250/ADuM1251, ability iCoupler channels integrated with semiconductor circuitry enables complete isolated interface provided small form-factor.
APPLICATIONS
Isolated I2C, SMbus, PMBus Interfaces Multi-Level Interfaces Power Supplies Networking Power-over-Ethernet
Protected U.S. Patents 5,952,849 6,873,065. Other patents pending.
FUNCTIONAL BLOCK DIAGRAMS
VDD1 SDA1 SCL1 GND1
DECODE ENCODE DECODE ENCODE
ENCODE DECODE ENCODE DECODE
VDD2 SDA2 SCL2 GND2
VDD1 SDA1 SCL1 GND1
DECODE ENCODE ENCODE
ENCODE DECODE DECODE
VDD2 SDA2 SCL2 GND2
Figure ADuM1250 Functional Block Diagram.
Figure ADuM1251 Functional Block Diagram.
Rev.
June 2006 Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties that result from use. Specifications subject change without notice. license granted implication otherwise under patent patent rights Analog Devices. Trademarks registered trademarks property their respective owners.
Technology Way, P.O. 9106, Norwood, 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703 2006 Analog Devices, Inc. rights reserved.
ADuM1250/ADuM1251 SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
voltages relative their respective ground. min/max specifications apply over entire recommended operating range, unless otherwise noted. typical specifications 25°C, VDD1 unless otherwise noted. Table
Parameter SPECIFICATIONS ADuM1250 Input Supply Current, Side Input Input Supply Current, Side Input Input Supply Current, Side 3.3V Input Input Supply Current, Side 3.3V Input ADuM1251 Input Supply Current, Side Input Input Supply Current, Side Input Input Supply Current, Side 3.3V Input Input Supply Current, Side 3.3V Input Leakage Currents Side Logic Levels Logic Input Threshold Logic High Input Threshold Logic Output Voltages Input/Output Logic Level Difference1 Side Logic Levels Logic Input Threshold Logic High Input Threshold Logic Output Voltages Symbol Unit Test Conditions
IDD1 IDD2 IDD1 IDD2 IDD1 IDD2 IDD1 IDD2 IISDA1, IISDA2, IISCL1, IISCL2 VSDA1IL, VSCL1IL VSDA1IH, VSCL1IH VSDA1OL, VSCL1OL VSDA1,VSCL1 VSDA2IL, VSCL2IL VSDA2IH, VSCL2IH VSDA2OL, VSCL2OL
0.01
VSDA1=VDD1, VSDA2 VDD2, VSCL1=VDD1, VSCL2 VDD2
0.3VDD2 0.7VDD2
ISDA1 ISCL1 ISDA1 ISCL1
ISDA2 ISCL2
Rev. Page
Parameter SPECIFICATIONS Maximum Frequency Output Fall Time Operation Side Output (0.9VDD1 0.9V) Side Output (0.9VDD2 0.1VDD2) Operation Side Output (0.9VDD1 0.9V) Side Output (0.9VDD2 0.1VDD2) Propagation Delay Operation Side 1-to-Side Rising Edge2 Side 1-to-Side Falling Edge3 Side 2-to-Side Rising Edge4 Side 2-to-Side Falling Edge5 Operation Side 1-to-Side Rising Edge2 Side 1-to-Side Falling Edge3 Side 2-to-Side Rising Edge4 Side 2-to-Side Falling Edge5 Pulse-Width Distortion Operation Side 1-to-Side |tPLH12 tPHL12| Side 2-to-Side |tPLH21 tPHL21| Operation Side 1-to-Side |tPLH12 tPHL12| Side 2-to-Side |tPLH21 tPHL21| Common-Mode Transient Immunity6 Symbol 1000 Unit
ADuM1250/ADuM1251
Test Conditions
Figure 4.5VVDD1,VDD25.5V, CL2=400 Figure 3.0VVDD1,VDD23.6V, CL1=40 Figure 4.5V VDD1, VDD2 5.5V, tPLH12 tPHL12 tPLH21 tPHL21 Figure 3.0V VDD1,VDD2 3.6V, tPLH12 tPHL12 tPLH21 tPHL21 Figure 4.5V VDD1, VDD2 5.5V, PWD12 PWD21 Figure 3.0V VDD1,VDD2 3.6V, PWD12 PWD21 |CMH|, |CML| kV/s
VS1L VS1OL VS1IL. This minimum difference between output logic level input logic threshold within given component. This ensures that there possibility part latching which connected. tPLH12 propagation delay measured from Side input logic threshold output value 0.7VDD2. tPHL12 propagation delay measured from Side input logic threshold output value 0.4V. tPLH21 propagation delay measured from Side input logic threshold output value 0.7VDD1. tPLH21 propagation delay measured from Side input logic threshold output value 0.9V. maximum common-mode voltage slew rate that sustained while maintaining VDD2. maximum common-mode voltage slew rate that sustained while maintaining common-mode voltage slew rates apply both rising falling common-mode voltage edges. transient magnitude range over which common mode slewed.
Rev. Page
ADuM1250/ADuM1251
PACKAGE CHARACTERISTICS
Table
Parameter Resistance (Input-Output)1 Capacitance (Input-Output)1 Input Capacitance Junction-to-Case Thermal Resistance, Side Junction-to-Case Thermal Resistance, Side Symbol RI-O CI-O 1012
Unit °C/W °C/W
Test Conditions Thermocouple located center package underside
device considered 2-terminal device; Pins shorted together, Pins shorted together.
REGULATORY INFORMATION (PENDING)
ADuM1250/ADuM1251 will approved following organizations upon product release Table
(pending) Recognized under 1577 Component Recognition Program1 Basic insulation, 2500 isolation rating (pending) Approved under Component Acceptance Notice Basic insulation 60950-1-03 60950-1, (560 peak) maximum working voltage (pending) Certified according 60747-5-2 (VDE 0884 Part 2):2003-012 Basic insulation,400 (560 peak) maximum working voltage
File E214100
File 205078
File 2471900-4880-0001
accordance with UL1577, each ADuM1250/1251 proof-tested applying insulation test voltage 3000 second (current leakage detection limit accordance with 60747-5-2, each ADuM1250/1251 proof-tested applying insulation test voltage 1050 peak second (partial discharge detection limit pC).
INSULATION SAFETY-RELATED SPECIFICATIONS
Table
Parameter Rated Dielectric Insulation Voltage Minimum External (Clearance) Minimum External Tracking (Creepage) Minimum Internal (Internal Clearance) Tracking Resistance (Comparative Tracking Index) Isolation Group Symbol L(I01) L(I02) Value 2500 4.90 4.01 0.017 >175 IIIa Unit Conditions minute duration Measured from input terminals output terminals, shortest distance through Measured from input terminals output terminals, shortest distance path along body Insulation distance through insulation 112/VDE 0303 Part Material Group (DIN 0110, 1/89, Table
Rev. Page
60747-5-2 (VDE 0884 PART INSULATION CHARACTERISTICS
Table
Description Installation Classification 0110 Rated Mains Voltage Rated Mains Voltage Rated Mains Voltage Climatic Classification Pollution Degree (DIN 0110, Table Maximum Working Insulation Voltage Input Output Test Voltage, Method VIORM 1.875 VPR, 100% Production Test, sec, Partial Discharge Input Output Test Voltage, Method After Environmental Tests Subgroup VIORM VPR, sec, Partial Discharge After Input and/or Safety Test Subgroup VIORM VPR, sec, Partial Discharge Highest Allowable Overvoltage (Transient Overvoltage, sec) Safety-Limiting Values (maximum value allowed event failure; also thermal derating curve, Figure Case Temperature Side Current Side Current Insulation Resistance
ADuM1250/ADuM1251
Symbol
Characteristic I-IV I-III I-II 40/105/21 1050
Unit
VIORM
peak peak
4000
peak
peak
>109
Note that marking package denotes 60747-5-2 approval peak working voltage. This isolator suitable basic isolation only within safety limit data. Maintenance safety data ensured protective circuits.
RECOMMENDED OPERATING CONDITIONS
Table
Parameter Operating Temperature Supply Voltages1 Input/Output Signal Voltage Symbol VDD1, VDD2 VSDA1, VSCL1, VSDA2, VSCL2 ISDA1, ISCL1 ISDA2, ISCL2 +105 Unit
Figure Thermal Derating Curve, Dependence Safety Limiting Values Case Temperature, 60747-5-2
Capacitive Load, Side Capacitive Load, Side Static Output Loading, Side Static Output Loading, Side
voltages relative their respective ground. Application Information section data immunity external magnetic fields.
Rev. Page
ADuM1250/ADuM1251 ABSOLUTE MAXIMUM RATINGS
Ambient temperature 25°C, unless otherwise noted. Table
Parameter Storage Temperature Ambient Operating Temperature Supply Voltages1 Input/Output Voltage1, Side Input/Output Voltage1, Side Average Output Current, Pin2 Common-Mode Transients3 Symbol VDD1, VDD2 VSDA1, VSCL1 VSDA2, VSCL2 -0.5 -0.5 -0.5 -100
VDD1 VDD2 +100
Unit kV/s
voltages relative their respective ground. Figure maximum rated current values various temperatures. Refers common-mode transients across insulation barrier. Common-mode transients exceeding Absolute Maximum Rating cause latch-up permanent damage.
Stresses above those listed under Absolute Maximum Ratings cause permanent damage device. This stress rating only; Functional operation device these other conditions above those listed operational sections this specification implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
CAUTION
(electrostatic discharge) sensitive device. Electrostatic charges high 4000 readily accumulate human body test equipment discharge without detection. Although this product features proprietary protection circuitry, permanent damage occur devices subjected high energy electrostatic discharges. Therefore, proper precautions recommended avoid performance degradation loss functionality.
Rev. Page
Preliminary Technical Data CONFIGURATION FUNCTION DESCRIPTIONS
VDD1 SDA1 SCL1 GND1
VDD2
ADuM1250/ADuM1251
SDA2 VIEW SCL2 (Not Scale) GND2
ADuM1250
Figure ADuM1250/ADuM1251 Configuration
Table ADuM1250 Function Descriptions
Mnemonic VDD1 SDA1 SCL1 GND1 GND2 SCL2 SDA2 VDD2 Function Supply voltage, Data Input/Output, Side Clock Input/Output, Side Ground Ground reference isolator Side Ground Isolated ground reference isolator Side Clock Input/Output, Side Data Input/Output, Side Supply voltage,
Table ADuM1251 Function Descriptions
Mnemonic VDD1 SDA1 SCL1 GND1 GND2 SCL2 SDA2 VDD2 Function Supply voltage, Data Input/Output, Side Clock Input, Side Ground Ground reference isolator Side Ground Isolated ground reference isolator Side Clock Output, Side Data Input/Output, Side Supply voltage,
Rev. Page
ADuM1250/ADuM1251 TEST CONDITIONS
VDD1 SDA1 SCL1
DECODE ENCODE DECODE ENCODE ENCODE DECODE ENCODE DECODE
VDD2 SDA2 SCL2 GND2
GND1
Figure Timing Test Diagram.
Rev. Page
Preliminary Technical Data APPLICATION INFORMATION
FUNCTIONAL DESCRIPTION
ADuM1250/ADuM1251 interfaces each side bidirectional signal. Internally, interface split into unidirectional channels communicating opposing directions dedicated iCoupler isolation channel each. channel (the bottom each channel pair Figure senses voltage state Side transmits state respective Side pin. Both Side Side pins designed interface operating 3.0V-to-5.5V range. logic either will cause opposite pulled enough comply with logic threshold requirements other devices bus. Avoidance contention ensured input threshold SDA1 SCL2 that guaranteed least less than output signal same pin. This prevents output logic Side from being transmitted back Side pulling down bus. Since Side logic levels/thresholds standard values, multiple ADuM1250/ADuM1251 devices connected their Side pins communicate with each other with other devices having compatibility1. However, since Side modified output level/input threshold, this side ADuM1250/ADuM1251 only communicate with devices conforming standard. other words, Side ADuM1250/ADuM1251 I2C-compliant while Side only I2C-compatible. output Logic levels independent VDD1 VDD2 voltages. input logic threshold Side also independent VDD1. However, input logic threshold Side design 0.3VDD2 consistent with requirements. Side Side pins have open-collector outputs whose HIGH levels pull-up resistors their respective supply voltages.
VDD1 SDA1 SCL1
DECODE ENCODE DECODE ENCODE ENCODE DECODE ENCODE DECODE
ADuM1250/ADuM1251
STARTUP
Both VDD1 VDD2 supplies have under voltage lockout feature that prevent signal channels from operating unless certain criteria met. This avoid possibility input logic signals from pulling down inadvertently during power-up/power-down. criteria that must order signal channels enabled follows: Both supplies must least 2.5V least must have elapsed since both supplies exceeded internal startup threshold 2.0V
Until both these criteria both supplies, ADuM1250/1251 outputs pulled high thereby ensuring startup that will avoid disturbances bus. Figure Figure illustrate supply conditions fast slow input supply slew rates.
min. recommended operating supply, 3.0V min. valid supply, 2.5V internal startup threshold, 2.0V
supply valid
Figure Startup condition, supply slew rate <12.5 V/ms.
min. recommended operating supply, 3.0V min. valid supply, 2.5V supply valid
VDD2 SDA2 SCL2 GND2
internal startup threshold, 2.0V
Figure Startup condition, supply slew rate >12.5 V/ms.
GND1
Figure ADuM1250 Block Diagram.
Here distinction made between compatibility compliance. compatibility refers situations which component's logic levels necessarily meet requirements specification still allow component communication with I2C-compliant device. compliance refers situations which component's logic levels meet requirements specification.
Rev. Page
ADuM1250/ADuM1251
MAXIMUM ALLOWABLE MAGNETIC FLUX DENSITY (kgauss)
TYPICAL APPLICATION DIAGRAMS
SDA1 SCL1
ADuM1250
SDA2 SCL2 GND2
0.01
Figure Typical Isolated Interface using ADuM1250.
0.001
MAGNETIC FIELD IMMUNITY
ADuM1250 extremely immune external magnetic fields. limitation ADuM1250's magnetic field immunity condition which induced voltage transformer's receiving coil sufficiently large either falsely reset decoder. following analysis defines conditions under which this occur. operating condition ADuM1250 examined because represents most susceptible mode operation. pulses transformer output have amplitude greater than decoder sensing threshold about therefore establishing margin which induced voltages tolerated. voltage induced across receiving coil given
100k MAGNETIC FIELD FREQUENCY (Hz)
100M
Figure Maximum Allowable External Magnetic Flux Density
example, magnetic field frequency MHz, maximum allowable magnetic field kgauss induces voltage 0.25 receiving coil. This about sensing threshold does cause faulty output transition. Similarly, such event were occur during transmitted pulse (and worst-case polarity), would reduce received pulse from 0.75 V-still well above sensing threshold decoder. preceding magnetic flux density values correspond specific current magnitudes given distances away from ADuM1250 transformers. Figure expresses these allowable current magnitudes function frequency selected distances. seen, ADuM1250 extremely immune affected only extremely large currents operated high frequency very close component. example, would have place current away from ADuM1250 affect component's operation.
1000
MAXIMUM ALLOWABLE CURRENT (kA)
1,2,.N
where: magnetic flux density (gauss). number turns receiving coil. radius turn receiving coil (cm). Given geometry receiving coil ADuM1250 imposed requirement that induced voltage most margin decoder, maximum allowable magnetic field calculated, shown Figure
DISTANCE
DISTANCE 100mm DISTANCE
100k
100M
MAGNETIC FIELD FREQUENCY (Hz)
Figure Maximum Allowable Current Various Current-to-ADuM1250 Spacings
Note that combinations strong magnetic fields high frequencies, loops formed printed circuit board traces could induce sufficiently large error voltages trigger threshold succeeding circuitry. Care should taken layout such traces avoid this possibility.
Rev. Page
04642-0-014
0.01
04642-0-013
ADuM1250/ADuM1251
Rev. Page
ADuM1250/ADuM1251 OUTLINE DIMENSIONS
5.00 (0.1968) 4.80 (0.1890)
4.00 (0.1574) 3.80 (0.1497)
6.20 (0.2440) 5.80 (0.2284)
1.27 (0.0500) 0.25 (0.0098) 0.10 (0.0040)
1.75 (0.0688) 1.35 (0.0532)
0.50 (0.0196) 0.25 (0.0099)
0.51 (0.0201) COPLANARITY SEATING 0.31 (0.0122) 0.10 PLANE
0.25 (0.0098) 1.27 (0.0500) 0.40 (0.0157) 0.17 (0.0067)
COMPLIANT JEDEC STANDARDS MS-012AA CONTROLLING DIMENSIONS MILLIMETERS; INCH DIMENSIONS PARENTHESES) ROUNDED-OFF MILLIMETER EQUIVALENTS REFERENCE ONLY APPROPRIATE DESIGN
Figure 8-Lead Standard Small Outline Package [SOIC]-Narrow Body (R-8) Dimensions shown millimeters (inches)
ORDERING GUIDE
Model ADuM1250ARZ ADuM1250ARZ-RL7 ADuM1251ARZ ADuM1251ARZ-RL7 Number Inputs, VDD1 Side Number Inputs, VDD2 Side Maximum Data Rate (Mbps) Maximum Propagation Delay (ns) Temperature Range (°C) +105 +105 +105 +105 Package Option1
8-lead narrow body Pb-free SOIC.
Rev. Page
PR06113-0-6/06(PrL)
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