HDMIULC6-4SC6Y Automotive ultralarge bandwidth ESD protection Datasheet production data Features ■ 4-line 15 kV ESD protection ■ Protects VBUS when applicable ■ Ultrahigh bandwidth - no influence on signal rise and fall times - maximized number of signal harmonics ■ Very low leakage current: 0.5 µA max. ■ Fast response time compared with varistors ■ SOT23-6L package ■ RoHS compliant Applications Benefits ■ ESD standards compliance guaranteed at device level, hence greater immunity at system level ■ ESD protection of VBUS when applicable. ■ High efficiency due to low residual voltage when confronted by an ESD surge ■ Minimized rise and fall times for maximum data integrity ■ Consistent D+ / D- signal balance: – Ultralow impact on intra-, inter-pair skew – Matching high bit rate HDMI requirements and ready for future evolution ■ Low PCB space occupation - 9 mm2 maximum footprint ■ Higher reliability offered by monolithic integration Complies with these standards: ■ IEC 61000-4-2 level 4 – 15 kV air discharge – 8 kV (and up to 15 kV) contact discharge September 2012 This is information on a product in full production. SOT23-6L (JEDEC MO178AB) ■ HDMI ports at 1.65 Gb/s and up to 3.2 Gb/s ■ IEEE 1394a, b, or c up to 3.2 Gb/s ■ USB 2.0 ports up to 480 Mb/s (Hi-Speed) ■ Ethernet port: 10/100/1000 Mb/s ■ Video line protection ■ AEC-Q101 qualified Description The HDMIULC6-4SC6Y is a monolithic, application specific discrete device dedicated to ESD protection of the HDMI connection. It also offers the same high level of protection for IEEE 1394a and IEEE 1394b/c, USB 2.0, Ethernet links, and video lines. Its ultrahigh cutoff frequency (5.3 GHz) secures a high level of signal integrity. The device topology provides this integrity without compromising the complete protection of ICs against the most stringent ESD strikes. Doc ID 018879 Rev 2 1/12 www.st.com 12 Characteristics 1 HDMIULC6-4SC6Y Characteristics Figure 1. Functional diagrams I/O1 1 6 I/O4 GND 2 5 VBUS I/O2 3 4 I/O3 When used with an HDMI application, Pin 5 should not be connected to protect against backdrive current flow. SOT23-6L Table 1. Absolute ratings Symbol Parameter Value Unit ±15 ±15 ±25 kV -55 to +150 °C IEC 61000-4-2 air discharge IEC 61000-4-2 contact discharge MIL STD883C-Method 3015-6 VPP Peak pulse voltage Tstg Storage temperature range Tj Maximum junction temperature 125 °C TL Lead solder temperature (10 seconds duration) 260 °C Table 2. Electrical characteristics (Tamb = 25° C) Value Symbol Parameter Test conditions Unit Min. IRM Leakage current VRM = 5 V VBR Breakdown voltage between VBUS and GND IR = 1 mA VCL Ci/o-GND Ci/oGND Ci/o-i/o Max 0.5 6 µA V IPP = 1 A, tp = 8/20 µs Any I/O pin to GND 12 V IPP = 5 A, tp = 8/20 µs Any I/O pin to GND 17 V Clamping voltage Capacitance between I/O VR = 0 V, F = 1 MHz and GND VR = 0 V, F = 825 MHz Capacitance variation between I/O and GND Capacitance between I/O 1 0.6 pF 0.015 VR = 0 V, F = 1 MHz 0.42 VR = 0 V, F = 825 MHz 0.3 Capacitance variation Ci/o-i/o between I/O 2/12 Typ. 0.007 Doc ID 018879 Rev 2 0.5 pF HDMIULC6-4SC6Y Figure 2. Characteristics Line capacitance versus line voltage (typical values) Figure 3. C(pF) C(pF) 1.0 1.0 F=825MHz Vosc=500mVRMS VBUS OPEN Tj =25 °C 0.9 0.8 0.7 Vosc=30mVRMS Tj =25°C VI-O/GND = 0V VBUS OPEN 0.9 0.8 0.7 0.6 0.6 0.5 0.5 CI/O - GND 0.4 0.4 0.3 0.3 CI/O - GND 0.2 0.2 0.1 CI/O - CI/O 0.1 Data line voltage (v) 0 F(MHz) 0 0.0 Figure 4. Line capacitance versus frequency (typical values) 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 Relative variation of leakage current versus junction temperature (typical values) 1 Figure 5. 10 100 1000 10000 Frequency response S21(dB) 0.00 IRM[Tj] / IRM[Tj=25°C] 5 - 3.00 4 - 6.00 3 - 9.00 2 - 12.00 F(Hz) Tj(°C) - 15.00 1 1.0M 25 50 75 100 125 Doc ID 018879 Rev 2 Ligne 10.0M 100.0M 1.0G 1 3/12 Application examples 2 HDMIULC6-4SC6Y Application examples Figure 6. HDMI digital single link application using HDMIULC6-4SC6Y Host (Set Top Box, DVD player, PC) HDMI Tx0- Rx0- Tx0+ Rx0+ TMDS transmitter HDMI connectors TMDS receiver video Multimedia controller Ctrl / status video Rx1- Tx1audio Display (TV, flat panel, monitor, projector) Tx1+ Rx1+ Tx2- Rx2- Tx2+ Rx2+ audio controller Ctrl / status HDMIULC6-4SC6 TC- RCRC+ TC+ TMDS links CEC CEC SCL SCL Vcc 5V Vcc 5V HDMIULC6-4SC6 SDA SDA HPD HPD Control links Figure 7. T1/E1/Ethernet protection Tx SMP75-8 +VCC 4 3 5 2 6 Rx SMP75-8 4/12 Doc ID 018879 Rev 2 1 100 nF Data Transeiver HDMIULC6-4SC6Y 2.1 Application examples PCB layout considerations For HDMI applications, VCC should not be connected. In this case the capacitor C in Figure 8. is not needed. Figure 8. PCB layout considerations (VCC connection is application dependent) D+1 HDMI 1 D-1 VCC connector GND side C = 100 nF D+2 D-2 HDMIULC6-4SC6 A differential impedance of 100 must be respected in the layout. Both lines of the differential pair should have the same length. Figure 9. SOT23-6L Footprint dimensions (in mm) 1.20 [0.047] 1.10 [0.043] 0.60 [0.023] 0.95 [0.037] 2.30 [0.091] 3.50 [0.138] Doc ID 018879 Rev 2 5/12 Technical information HDMIULC6-4SC6Y 3 Technical information 3.1 Surge protection The HDMIULC6-4SC6Y is particularly optimized to perform ESD surge protection based on the rail to rail topology. The clamping voltage VCL can be calculated as follows – VCL+ = VTransil + VF, for positive surges – VCL- = - VF, for negative surges with: VF = VT + Rd.Ip (VF forward drop voltage) / (VT forward drop threshold voltage) and VTransil = VBR + Rd_Transil · IP Calculation example We assume that the value of the dynamic resistance of the clamping diode is typically: Rd = 0.5 and VT = 1.1 V. We assume that the value of the dynamic resistance of the Transil diode is typically Rd_Transil = 0.5 and VBR = 6.1 V For an IEC 61000-4-2 surge Level 4 (Contact Discharge: Vg = 8 kV, Rg = 330 ), VBUS = +5 V, and, in first approximation, we assume that: Ip = Vg / Rg = 24 A. We find: – VCL+ = +31.2 V – VCL- = -13.1 V Note: The calculations do not take into account phenomena due to parasitic inductances. 3.2 Surge protection application example If we consider that the connections from the pin VBUS to VCC, from I/O to data line, and from GND to PCB GND plane are two tracks 10 mm long and 0.5 mm wide, we can assume that the parasitic inductances, LVBUS, LI/O, and LGND, of these tracks are about 6 nH. So when an IEC 61000-4-2 surge occurs on the data line, due to the rise time of this spike (tr = 1 ns), the voltage VCL has an extra value equal to LI/O.dI/dt + LGND.dI/dt. The dI/dt is calculated as: dI/dt = Ip/tr = 24 A/ns for an IEC 61000-4-2 surge level 4 (contact discharge Vg = 8 kV, Rg = 330 The over voltage due to the parasitic inductances is: LI/O.dI/dt = LGND.dI/dt = 6 x 24 = 144 V By taking into account the effect of these parasitic inductances due to unsuitable layout, the clamping voltage will be: – VCL+ = +31.2 + 144 +144 = 319.2 V – VCL- = -13.1 - 144 -144 = -301.1 V We can reduce as much as possible these phenomena with simple layout optimization. 6/12 Doc ID 018879 Rev 2 HDMIULC6-4SC6Y Technical information It’s the reason why some recommendations have to be followed (see Section 3.3: How to ensure good ESD protection). Figure 10. ESD behavior: parasitic phenomena due to unsuitable layout ESD surge on data line VCL+ VBUS Data line LI/O LI/O di L VBUS dt L I/O di di + L GND dt dt POSITIVE SURGE Vcc pin VF VTRANSIL VTRANSIL +VF VCL I/O pin t tr=1ns GND pin LGND LGND tr=1ns di dt t -VF di di + L GND dt dt di di - L GND dt dt VCL + = VTRANSIL + VF + L I/O VCL - = - VF - L I/O surge > 0 - L I/O surge < 0 di di - L GND dt dt NEGATIVE SURGE VTRANSIL = VBR + Rd.Ip VCL- 3.3 How to ensure good ESD protection While the HDMIULC6-4SC6Y provides a high immunity to ESD surge, an efficient protection depends on the layout of the board. In the same way, with the rail to rail topology, the track from data lines to I/O pins, from VCC to VBUS pin, and from GND plane to GND pin must be as short as possible to avoid over voltages due to parasitic phenomena (see Figure 10 and Figure 11 for layout considerations). Figure 11. ESD behavior: layout optimization Figure 12. ESD behavior: measurement conditions ESD SURGE TEST BOARD Unsuitable layout IN OUT HDMIULC6- 4SC6 Vbus Optimized layout Doc ID 018879 Rev 2 7/12 Technical information HDMIULC6-4SC6Y Figure 13. Note: Figure 14. The measurements have been done with the HDMIULC6-4SC6Y in open circuit. Important: An important precaution to take is to put the protection device as close as possible to the disturbance source (generally the connector). 3.4 Crosstalk behavior Figure 15. Crosstalk phenomena RG1 Line 1 VG1 RL1 RG2 α 1 VG1 + β12VG2 Line 2 VG2 RL2 DRIVERS α 2VG2 + β21VG1 RECEIVERS The crosstalk phenomena is due to the coupling between 2 lines. The coupling factor (12 or 21) increases when the gap across lines decreases, particularly in silicon dice. In the example above the expected signal on load RL2 is 2VG2, in fact the real voltage at this point has got an extra value 21VG1. This part of the VG1 signal represents the effect of the crosstalk phenomenon of the line 1 on the line 2. This phenomenon has to be taken into account when the drivers impose fast digital data or high frequency analog signals in the disturbing line. The perturbed line will be more affected if it works with low voltage signal or high load impedance (few k). 8/12 Doc ID 018879 Rev 2 HDMIULC6-4SC6Y Technical information Figure 16. Analog crosstalk measurements TEST BOARD NETWORK ANALYSER PORT 2 NETWORK ANALYSER PORT 1 Figure 16 gives the measurement circuit for the analog application. In usual frequency range of analog signals (up to 240 MHz) the effect on disturbed line is less than -45 dB (see Figure 17). Figure 17. Analog crosstalk results 0.00 dB - 30.00 - 60.00 - 90.00 F (Hz) - 120.00 100.0k 1.0M 10.0M 100.0M 1.0G As the HDMIULC6-4SC6Y is designed to protect high speed data lines, it must ensure a good transmission of operating signals. The frequency response (Figure 5.) gives attenuation information and shows that the HDMIULC6-4SC6Y is well suitable for data line transmission up to 3.2 Gb/s. Doc ID 018879 Rev 2 9/12 Package information 4 HDMIULC6-4SC6Y Package information ● Epoxy meets UL94, V0 ● Lead-free package In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Table 3. SOT23-6L dimensions Dimensions Ref. Millimeters Min. Typ. Max. c Inches Min. Typ. Max. A 0.90 1.45 0.035 0.057 A1 0 0.15 0.006 A2 0.90 1.30 0.035 0.051 b 0.30 0.50 0.012 0.020 c 0.09 0.20 0.004 0.008 D 2.80 3.05 0.11 0.118 E 1.50 1.75 0.059 0.069 A1 θ L 0 H A E e D b e e A2 0.95 H 2.60 3.00 0.102 0.118 L 0.30 0.60 0.012 0.024 0° 10° Figure 18. Footprint (dimensions in mm) 0.60 1.20 0.95 3.50 10/12 2.30 Doc ID 018879 Rev 2 0.037 1.10 0° 10° HDMIULC6-4SC6Y 5 Ordering information Ordering information Table 4. 6 Ordering information Order code Marking Package Weight Base qty Delivery mode HDMIULC6-4SC6Y DL4Y SOT23-6L 16.7 mg 3000 Tape and reel Revision history Table 5. Document revision history Date Revision Changes 24-May-2011 1 First issue. 06-Sep-2012 2 Updated dimension A1 max., b min. and L min. in Table 3. Doc ID 018879 Rev 2 11/12 HDMIULC6-4SC6Y Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. 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