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IL7710
Low Power High Speed Digital Coupler
Functional Diagram Features
ISOLOOP(R)
* +5V/+3.3V CMOS/TTL Compatible * High Speed: 110 MBd * 2500VRMS Isolation (1 Min.) * 2 ns Typical Pulse Width Distortion * 4 ns Typical Propagation Delay Skew * 10 ns Typical Propagation Delay * 30 kV/us Typical Common Mode Rejection * Tri State Output * 8-pin PDIP and 8-pin SOIC Packages * UL1577 Approval Pending * IEC 61010-1 Approval Pending
Isolation Applications
* Digital Fieldbus * USB, RS485 and RS422 * Multiplexed Data Transmission * Data Interfaces * Board-To-Board Communication * Digital Noise Reduction * Operator Interface * Ground Loop Elimination * Peripheral Interfaces * Serial Communication * Logic Level Shifting
Description
The IL7710 is a lower power version of NVE's popular IL710 device. It features half the quiescent current consumption of the IL710 but has equivalent dynamic specifications. Fabricated with NVE's patented IsoLoop technology, the IL7710 has only 10 ns typical propagation delay and 2ns pulse width distortion. The IL7710's specifications are valid over the industrial temperature range of -40C to +85C.
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
IL7710
Absolute Maximum Ratings
Parameters Storage Temperature Supply Voltage Input Voltage Input Voltage Output Voltage Output Current Drive Lead Solder Temperature (10s) ESD
ISOLOOP(R)
Symbol TS TA VDD1,VDD2 VI VOE VO IO
Min. -55 -55 -0.5 -0.5 -0.5 -0.5
Max. 175 125 7 VDD1+0.5 VDD2+0.5 VDD2+0.5 10
Units o C
o
Ambient Operating Temperature(1)
C
Volts Volts Volts Volts mA
o
260 2kV Human Body Model
C
Recommended Operating Conditions
Parameters Ambient Operating Temperature Supply Voltage (3.3/5.0 V operation) Supply Voltage (5.0 V operation) Logic High Input Voltage Logic Low Input Voltage Minimum Signal Rise and Fall Times Symbol TA VDD1,VDD2 VDD1,VDD2 VIH VIL tIR,tIF Min. -40 3.0 4.5 2.4 0 Max. 85 5.5 5.5 VDD1 0.8 1 Units o C Volts Volts Volts Volts sec
Insulation Specifications
Parameter Barrier Impedance Creepage Distance (External) Leakage Current 240 VRMS 60Hz Condition Min. 7.036 (PDIP) 4.026 (SOIC) 0.2 Typ. >1014 ||3 Max. Units || pF mm A
Package Characteristics
Parameter Capacitance (Input-Output)(5) Thermal Resistance (PDIP) (SOIC) Package Power Dissipation Symbol CI-O JCT JCT PPD Min. Typ. 1.1 54 144 15 Max. Units pF o C/W
o
Test Conditions f= 1MHz Thermocouple located at center underside of package f= 1MHz, VDD=5V
C/W
mW
IEC61010-1
TUV Certificate Numbers: Classification as Table 1. Model IL7710-2 IL7710-3 Pollution Degree II II Material Group III III Max Working Voltage 300 VRMS 150 VRMS 8-PDIP Package Type 8-SOIC Pending (PDIP) Pending (SOIC)
UL 1577
Component Recognition program. File # Pending Rated 2500Vrms for 1min.
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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
IL7710
Electrical Specifications
Electrical Specifications are Tmin to Tmax unless otherwise stated. Parameter Symbol 3.3 Volt Specifications DC Specifications Min. Typ. Max. Input Quiescent Supply Current IDD1 8 10 Output Quiescent Supply Current IDD2 1.7 2 Logic Input Current Logic High Output Voltage Logic Low Output Voltage Switching Specifications Maximum Data Rate Pulse Width Propagation Delay Input to Output (High to Low) Propagation Delay Input to Output (Low to High) Propagation Delay Enable to Output (High to High Impedance) Propagation Delay Enable to Output (Low to High Impedance) Propagation Delay Enable to Output (High Impedance to High) Propagation Delay Enable to Output (High Impedance to Low) Pulse Width Distortion(2) Propagation Delay Skew(3) Output Rise Time (10-90%) Output Fall Time (10-90%) Common Mode Transient Immunity (Output Logic High or Logic Low) (4) PW tPHL tPLH tPHZ tPLZ tPZH tPZL tPSK tR tF |CMH| 20 |CML| 30 20 30 kV/s II VOH VOL -10 VDD2-0.1 VDD2 0.8*VDD2 VDD2-0.5 0 0.5 100 10 12 12 3 3 3 3 2 4 2 2 18 18 5 5 5 5 3 6 4 4 110 0.1 0.8 100 10 10 10 3 3 3 3 2 4 1 1 15 15 5 5 5 5 3 6 3 3 10 5.0 Volt Specifications Min. Typ. Max. 10 15 2.5 -10 VDD2-0.1 VDD2 0.8*VDD2 VDD2-0.5 0 0.5 110 0.1 0.8 3 10 Units A mA A V V
ISOLOOP(R)
Test Conditions
IO =-20 A, VI =VIH I = -4 mA, V =V
O I IH
IO = 20 A, VI =VIL I = 4 mA, V =V
O I IL
MBd ns ns ns ns ns ns ns ns ns ns
CL = 15 pF CL = 15 pF CL = 15 pF CL = 15 pF CL = 15 pF CL = 15 pF CL = 15 pF CL = 15 pF CL = 15 pF CL = 15 pF Vcm = 300V
Notes:
1. Absolute Maximum ambient operating temperature means the device will not be damaged if operated under these conditions. It does not guarantee performance. PWD is defined as | tPHL - tPLH |. %PWD is equal to the PWD divided by the pulse width. tPSK is equal to the magnitude of the worst case difference in tPHL and/or tPLH that will be seen between units at 25OC. 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 input voltage 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. Device is considered a two terminal device: pins 1-4 shorted and pins 5-8 shorted.
2. 3. 4.
5.
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
IL7710
Application Notes:
ISOLOOP(R)
Dynamic 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 IsoLoop(R) is:
Data Transmission Rates
The reliability of a transmission system is directly related to the accuracy and quality of the transmitted digital information. For a digital system, those parameters which determine the limits of the data transmission are pulse width distortion and propagation delay skew. Propagation delay is the time taken for the signal to travel through the device. This is usually different when sending a low-to-high than when sending a high-to-low signal. This difference, or error, is called pulse width distortion (PWD) and is usually in ns. It may also be expressed as a percentage:
PWD% = Maximum Pulse Width Distortion (ns) Signal Pulse Width (ns) For example: For data rates of 12.5 Mb PWD% = 3 ns 80 ns x 100% = 3.75% x 100%
Power Supply Decoupling
Both power supplies to these devices should be decoupled with low ESR 47 nF ceramic capacitors. For data rates in excess of 10MBd, use of ground planes for both GND1 and GND2 is highly recommended. Capacitors should be located as close as possible to the device.
This figure is almost three times better than for any available optocoupler with the same temperature range, and two times better than any optocoupler regardless of published temperature range. The IsoLoop(R) range of isolators surpasses the 10% maximum PWD recommended by PROFIBUS, and will run at almost 35 Mb before reaching the 10% limit. Propagation delay skew is the difference in time taken for two or more channels to propagate their signals. This becomes significant when clocking is involved since it is undesirable for the clock pulse to arrive before the data has settled. A short propagation delay skew is therefore critical, especially in high data rate parallel systems, to establish and maintain accuracy and repeatability. The IsoLoop(R) range of isolators all have a maximum propagation delay skew of 6 ns, which is five times better than any optocoupler.
Signal Status on Start-up and Shut Down
To minimize power dissipation, the input signals are differentiated and then latched on the output side of the isolation barrier to reconstruct the signal. This could result in an ambiguous output state depending on power up, shutdown and power loss sequencing. Therefore, the designer should consider the inclusion of an initialization signal in his start-up circuit. Initialization consists of toggling the input either high then low or low then high, depending on the desired state.
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
IL7710
Applications Isolated RS-485
RS-485 Truth Table
TXD 1 0 1 0 RTS 0 0 1 1 A Z Z 1 0 B Z Z 0 1 RXD X X 1 0
ISOLOOP(R)
Reference 485 Drivers (Texas Instruments) 65ALS176 (-40C to +85C) 75ALS176 (0C to +70) VDD1 and VISO should be decoupled with 10 nF capacitors at IL7710 supply pins
USB
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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
IL7710
Pin Configuration
ISOLOOP(R)
Truth Table
VI L H L H VOE L L H H VO L H Z Z
Timing Diagram Legend
tPLH tPHL tPW tPLZ tPZH tPHZ tPZL tR tF Propagation Delay, Low to High Propagation Delay, High to Low Minimum Pulse Width Propagation Delay, Low to High Impedance Propagation Delay, High Impedance to High Propagation Delay, High to High Impedance Propagation Delay, High Impedance to Low Rise Time Fall Time
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
IL7710
IL7710-2 (8-Pin PDIP Package)
ISOLOOP(R)
IL7710-3 (Small Outline SOIC-8 package)
Ordering Information: use the following format to order these devices
IL 7710
-2
TR7
Bulk Package Blank = Tube TR7 = 7'' Tape and Reel TR13 = 13'' Tape and Reel Package -2 = PDIP -3 = SOIC (0.15'') Base Part Number 7710 = Reduced power 1 drive channel Product Family IL = Isolators Valid Part Numbers IL 7710-2 IL 7710-3 IL 7710-3TR13 IL 7710-3TR7
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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
NVE Corporation is a world leader in the practical commercialization of "spintronics," which many experts believe represents the next generation of microelectronics -- the successor to the transistor. Unlike conventional electronics, which rely on electron charge, spintronics uses electron spin to store and transmit information. Spintronics devices are smaller, faster, and more accurate, compared to charge-based microelectronics. It is the spin of electrons that causes magnetism. NVE's products use proprietary spintronic materials called Giant Magnetoresistors (GMR). These materials are made of exotic alloys a few atoms thick, and provide very large signals (the "Giant" in "Giant Magnetoresistor"). NVE has the unique capability to combine leading edge GMR materials with integrated circuits to make high performance electronic components. We are pioneers in creating practical products using this revolutionary technology and introduced the world's first GMR products in 1994. We also license spintronics/Magnetic Random Access Memory (MRAM) designs to world-class memory manufacturers. Our products include: * Digital Signal Isolators * Isolated Bus Transceivers * Magnetic Field Sensors * Magnetic Field Gradient Sensors (Gradiometer) * Digital Magnetic Field Sensors. 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-IL7710-A November 2003

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