CM1293 8-Channel Low Capacitance ESD Protection Arrays Product Description The CM1293 family of diode arrays has been designed to provide ESD protection for electronic components or sub−systems requiring minimal capacitive loading. These devices are ideal for protecting systems with high data and clock rates or for circuits requiring low capacitive loading. Each ESD channel consists of a pair of diodes in series which steer the positive or negative ESD current pulse to either the positive (VP) or negative (VN) supply rail. A Zener diode is embedded between VP and VN, offering two advantages. First, it protects the VCC rail against ESD strikes, and second, it eliminates the need for a bypass capacitor that would otherwise be needed for absorbing positive ESD strikes to ground. The CM1293 will protect against ESD pulses up to (8 kV contact discharge) per the IEC 61000−4−2 Level 4 standard. This device is particularly well−suited for protecting systems using high−speed ports such as USB2.0, IEEE1394 (FireWire®, i.LINKt), Serial ATA, DVI, HDMI and corresponding ports in removable storage, digital camcorders, DVD−RW drives and other applications where extremely low loading capacitance with ESD protection are required in a small package footprint. http://onsemi.com MSOP−10 MR SUFFIX CASE 846AE BLOCK DIAGRAM CH8 CH7 CH1 CH2 VP VN CH6 CH5 CH3 CH4 CM1293−08MR MARKING DIAGRAM Features • Eight Channels of ESD Protection • • • • • • • Note: For 2 and 4 Channel Devices, See the CM1293A Datasheet Provides ESD Protection to IEC61000−4−2 • ±8 kV Contact Discharge Low Loading Capacitance of 2.0 pF Max Low Clamping Voltage Channel I/O to I/O Capacitance 1.5 pF Typical Zener Diode Protects Supply Rail and Eliminates the Need for External By−Pass Capacitors Each I/O Pin Can Withstand over 1000 ESD Strikes* These Devices are Pb−Free and are RoHS Compliant Applications • DVI Ports, HDMI Ports in Notebooks, Set Top Boxes, Digital TVs, D039 D039 = CM1293−08MR ORDERING INFORMATION Device Package Shipping† CM1293−08MR MSOP−10 (Pb−Free) 4000/Tape & Reel †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D. LCD Displays • Serial ATA Ports in Desktop PCs and Hard Disk Drives • PCI Express Ports • General Purpose High−Speed Data Line ESD Protection *Standard test condition is IEC61000−4−2 level 4 test circuit with each pin subjected to ±8 kV contact discharge for 1000 pulses. Discharges are timed at 1 second intervals and all 1000 strikes are completed in one continuous test run. The part is then subjected to standard production test to verify that all of the tested parameters are within spec after the 1000 strikes. © Semiconductor Components Industries, LLC, 2011 March, 2011 − Rev. 4 1 Publication Order Number: CM1293/D CM1293 PACKAGE / PINOUT DIAGRAM Table 1. PIN DESCRIPTIONS 8−Channel, 10−Lead MSOP−10 Package Top View Name Type Description 1 CH1 I/O ESD Channel 2 CH2 I/O ESD Channel 3 CH3 I/O ESD Channel 4 CH4 I/O ESD Channel 5 VN GND Negative Voltage Supply Rail 6 CH5 I/O ESD Channel 7 CH6 I/O ESD Channel 8 VP PWR Positive Voltage Supply Rail 9 CH7 I/O ESD Channel 10 CH8 I/O ESD Channel CH1 CH2 CH3 CH4 VN 1 2 3 4 5 D039 Pin 10 9 8 7 6 CH8 CH7 VP CH6 CH5 10−Lead MSOP−10 SPECIFICATIONS Table 2. ABSOLUTE MAXIMUM RATINGS Parameter Rating Units 6.0 V Operating Temperature Range −40 to +85 °C Storage Temperature Range −65 to +150 °C (VN − 0.5) to (VP + 0.5) V Operating Supply Voltage (VP − VN) DC Voltage at any Channel Input Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. Table 3. STANDARD OPERATING CONDITIONS Parameter Operating Temperature Range Package Power Rating MSOP−10 Package (CM1293−08MR) Rating Units −40 to +85 °C 400 http://onsemi.com 2 mW CM1293 Table 4. ELECTRICAL OPERATING CHARACTERISTICS (Note 1) Symbol Parameter Conditions VP Operating Supply Voltage (VP−VN) IP Operating Supply Current (VP−VN) = 3.3 V VF Diode Forward Voltage Top Diode Bottom Diode IF = 8 mA, TA = 25°C Channel Leakage Current Min Max Units 3.3 5.5 V 8.0 mA V 0.80 0.80 0.95 0.95 TA = 25°C, VP = 5 V, VN = 0 V ±0.1 ±1.0 mA Channel Input Capacitance At 1 MHz, VP = 3.3 V, VN = 0 V, VIN = 1.65 V 1.0 1.5 pF DCIN Channel Input Capacitance Matching At 1 MHz, VP = 3.3 V, VN = 0 V, VIN = 1.65 V 0.02 pF CMUTUAL Mutual Capacitance between Signal Pin and Adjacent Signal Pin At 1 MHz, VP = 3.3 V, VN = 0 V, VIN = 1.65 V 0.11 pF ILEAK CIN VESD VCL RDYN 1. 2. 3. 4. ESD Protection Peak Discharge Voltage at any Channel Input, in System Contact Discharge per IEC 61000−4−2 Standard 0.60 0.60 Typ kV TA = 25°C (Notes 3 and 4) Channel Clamp Voltage Positive Transients Negative Transients TA = 25°C, IPP = 1 A, tP = 8/20 mS (Note 4) Dynamic Resistance Positive Transients Negative Transients IPP = 1 A, tP = 8/20 mS Any I/O Pin to Ground (Note 4) ±8 +8.8 −1.4 0.7 0.4 All parameters specified at TA = −40°C to +85°C unless otherwise noted. Human Body Model per MIL−STD−883, Method 3015, CDischarge = 100 pF, RDischarge = 1.5 KW, VP = 3.3 V, VN grounded. Standard IEC 61000−4−2 with CDischarge = 150 pF, RDischarge = 330 W, VP = 3.3 V, VN grounded. These measurements performed with no external capacitor on VP (VP floating). http://onsemi.com 3 V W CM1293 PERFORMANCE INFORMATION Input Channel Capacitance Performance Curves Figure 1. Typical Variation of CIN vs. VIN (f = 1 MHz, VP = 3.3 V, VN = 0 V, 0.1 mF Chip Capacitor between VP and VN, 255C) Figure 2. Typical Variation of CIN vs. Temp (f = 1 MHz, VIN = 30 mV, VP = 3.3 V, VN = 0 V, 0.1 mF Chip Capacitor between VP and VN) http://onsemi.com 4 CM1293 PERFORMANCE INFORMATION (Cont’d) Typical Filter Performance (Nominal Conditions unless Specified Otherwise, 50 W Environment) Figure 3. Insertion Loss (S21) vs. Frequency (0 VDC Bias, VP = 3.3 V) Figure 4. Insertion Loss (S21) vs. Frequency (2.5 VDC Bias, VP = 3.3 V) http://onsemi.com 5 CM1293 APPLICATION INFORMATION Design Considerations In order to realize the maximum protection against ESD pulses, care must be taken in the PCB layout to minimize parasitic series inductances on the Supply/Ground rails as well as the signal trace segment between the signal input (typically a connector) and the ESD protection device. Refer to Application of Positive ESD Pulse between Input Channel and Ground, which illustrates an example of a positive ESD pulse striking an input channel. The parasitic series inductance back to power supply is represented by L1 and L2. The voltage VCL on the line being protected is: VCL = Fwd Voltage Drop of D1 + VSUPPLY + L1 x d(IESD ) / dt + L2 x d(IESD ) / dt where IESD is the ESD current pulse, and VSUPPLY is the positive supply voltage. An ESD current pulse can rise from zero to its peak value in a very short time. As an example, a level 4 contact discharge per the IEC61000−4−2 standard results in a current pulse that rises from zero to 30 Amps in 1 ns. Here d(IESD)/dt can be approximated by DIESD/Dt, or 30/(1x10−9). So just 10 nH of series inductance (L1 and L2 combined) will lead to a 300 V increment in VCL! Similarly for negative ESD pulses, parasitic series inductance from the VN pin to the ground rail will lead to drastically increased negative voltage on the line being protected. The CM1293 has an integrated Zener diode between VP and VN. This greatly reduces the effect of supply rail inductance L2 on VCL by clamping VP at the breakdown voltage of the Zener diode. However, for the lowest possible VCL, especially when VP is biased at a voltage significantly below the Zener breakdown voltage, it is recommended that a 0.22 mF ceramic chip capacitor be connected between VP and the ground plane. As a general rule, the ESD Protection Array should be located as close as possible to the point of entry of expected electrostatic discharges. The power supply bypass capacitor mentioned above should be as close to the VP pin of the Protection Array as possible, with minimum PCB trace lengths to the power supply, ground planes and between the signal input and the ESD device to minimize stray series inductance. L2 VP ÇÇÇÇÇÇ ÇÇÇÇÇÇ ÇÇÇÇÇÇ ÇÇÇÇÇÇ ÇÇÇÇÇÇ ÇÇÇÇÇÇ D1 0.22 mF D2 VN ONE CHANNEL POSITIVE SUPPLY RAIL VCC ÇÇÇÇÇÇ ÇÇÇÇÇÇ ÇÇÇÇÇÇ ÇÇÇÇÇÇ ÇÇÇÇÇÇ ÇÇÇÇÇÇ PATH OF ESD CURRENT PULSE IESO LINE BEING PROTECTED L1 CHANNEL INPUT 25 A 0A SYSTEM OR CIRCUITRY BEING PROTECTED VCL GROUND RAIL CHASSIS GROUND Figure 5. Application of Positive ESD Pulse between Input Channel and Ground http://onsemi.com 6 CM1293 PACKAGE DIMENSIONS MSOP 10, 3x3 CASE 846AE−01 ISSUE O SYMBOL MIN NOM A E E1 MAX 1.10 A1 0.00 0.05 0.15 A2 0.75 0.85 0.95 b 0.17 0.27 c 0.13 0.23 D 2.90 3.00 3.10 E 4.75 4.90 5.05 E1 2.90 3.00 3.10 e L 0.50 BSC 0.40 0.60 L1 0.95 REF L2 0.25 BSC θ 0º 0.80 8º DETAIL A TOP VIEW D A A2 END VIEW c A1 e b q SIDE VIEW L2 Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MO-187. L L1 DETAIL A FireWire is a registered trademark of Apple Computer, Inc.; i.LINK is a trademark of Sony Corporation. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. 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