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july 2006 rev 2 1/11 HDMIULC6-4SC6 ultra large bandwidth esd protection main applications 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 description the HDMIULC6-4SC6 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 ultra high 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. features 4 line 15 kv esd protection protects v bus when applicable ultra high bandwidth - no inluence on signal rise and fall times - maximised number of signal harmonics very low leakage current: 0.5 a max. fast response time compared with varistors sot23-6l package rohs compliant complies with these standards: iec 61000-4-2 level 4 ? 15 kv air discharge ? 8 kv (and up to 15 kv) contact discharge functional diagram benefits esd standards compliance guaranteed at device level, hence greater immunity at system level esd protection of v bus 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: ? ultra low impact on intra-, inter-pair skew ? matching high bit rate hdmi requirements and ready for future evolution low pcb space occupation - 9 mm2 maximum foot print low leakage current for longer operation of battery powered devices higher reliability offered by monolithic integration order code part number marking HDMIULC6-4SC6 dl46 sot23-6l (jedec mo178ab) 1 1 6 2 5 3 4 i/o1 i/o4 gnd v bus i/o2 i/o3 when used with an hdmi application, pin 5 should not be connected to protect against backdrive current flow. www.st.com
characteristics HDMIULC6-4SC6 2/11 1 characteristics table 1. absolute ratings symbol parameter value unit v pp peak pulse voltage iec 61000-4-2 air discharge iec 61000-4-2 contact discharge mil std883c-method 3015-6 15 15 25 kv t stg storage temperature range -55 to +150 c t j maximum junction temperature 125 c t l lead solder temperature (10 seconds duration) 260 c table 2. electrical characteristics (t amb = 25 c) symbol parameter test conditions value unit min. typ. max i rm leakage current v rm = 5 v 0.5 a v br breakdown voltage between v bus and gnd i r = 1 ma 6 v v cl clamping voltage i pp = 1 a, t p = 8/20 s any i/o pin to gnd 12 v i pp = 5 a, t p = 8/20 s any i/o pin to gnd 17 v c i/o-gnd capacitance between i/o and gnd v r = 0 v, f = 1 mhz 1 pf v r = 0 v, f = 825 mhz 0.6 ? c i/o-gnd capacitance variation between i/o and gnd 0.015 c i/o-i/o capacitance between i/o v r = 0 v, f = 1 mhz 0.42 0.5 pf v r = 0 v, f = 825 mhz 0.3 ? c i/o-i/o capacitance variation between i/o 0.007
HDMIULC6-4SC6 characteristics 3/11 figure 1. line capacitance versus line voltage (typical values) figure 2. line capacitance versus frequency (typical values) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 f=825mhz v osc = 500mv rms v bus open t j =25 c 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 data line voltage (v) c i/o - gnd c(pf) 0 v osc =30mv rms t j =25 c v i-o/gnd = 0v f(mhz) 1 10 100 1000 10000 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 c(pf) c i/o - gnd c i/o -c i/o v open bus figure 3. relative variation of leakage current versus junction temperature (typical values) figure 4. frequency response 1 2 3 4 5 25 50 75 100 125 i[t rm j ] / i [t rm j =25c] t (c) j 100.0k 1.0m 10.0m 100.0m 1.0g 100.0k 1.0m 10.0m 100.0m 1.0g 100.0k 1.0m 10.0m 100.0m 1.0g 0 -2 -4 -6 -8 f(hz) s21(db) attenuation
application examples HDMIULC6-4SC6 4/11 2 application examples figure 5. hdmi digital single link application using HDMIULC6-4SC6 figure 6. t1/e1/ethernet protection tmds links tc+ tc- tx2+ tx2- tx1+ tx1- tx0+ tx0- tmds transmitter video audio ctrl / status video audio ctrl / status multimedia controller controller rx0- rx0+ tmds receiver rx1- rx1+ rx2- rx2+ rc- rc+ display (tv, flat panel, monitor, projector) host (set top box, dvd player, pc) scl cec cec scl control links sda sda hpd hpd hdmi connectors vcc 5v vcc 5v HDMIULC6-4SC6 HDMIULC6-4SC6 hdmi +v cc 100 nf data transceiver smp75-8 smp75-8 tx rx 1 1 6 2 5 3 4
HDMIULC6-4SC6 application examples 5/11 2.1 pcb layout considerations for hdmi applications, v cc should not be connected. in this case the capacitor c in figure 7. is not needed. figure 7. pcb layout considerations (v cc connection is application dependent) a differential impedance of 100 ? must be respected in the layout. both lines of the differential pair should have the same length. figure 8. footprint dimensions (in mm) d+1 c = 100 nf d-1 gnd HDMIULC6-4SC6 d+2 d-2 v cc 1 hdmi connector side 0.95 0.60 1.20 1.10 3.50 2.30
technical information HDMIULC6-4SC6 6/11 3 technical information 3.1 surge protection the HDMIULC6-4SC6 is particularly optimized to perform esd surge protection based on the rail to rail topology. the clamping voltage v cl can be calculated as follows: with: v f = v t + r d .i p (v f forward drop voltage) / (v t forward drop threshold voltage) and v transil = v br + r d_transil . i p calculation example we assume that the value of the dynamic resistance of the clamping diode is typically: r d = 0.5 ? and v t = 1.1 v. we assume that the value of the dynamic resisteance of the transil diode is typically r d_transil = 0.5 ? and v br = 6.1 v for an iec 61000-4-2 surge level 4 (contact discharge: v g = 8 kv, r g = 330 ? ), v bus = +5 v, and, in first approximation, we assume that: i p = v g / r g = 24 a. we find: 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 v bus to v cc , 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, l vbus , l i/o , and l gnd , 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 v cl has an extra value equal to l i/o .di/dt + l gnd .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 v g = 8 kv, r g = 330 ? the over voltage due to the parasitic inductances is: l i/o .di/dt = l gnd .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: we can reduce as much as possible these phenomena with simple layout optimization. v cl + = v transil + v f for positive surges v cl - = - v f for negative surges v cl + = +31.2 v v cl - = -13.1 v v cl + = +31.2 + 144 +144 = 319.2 v v cl - = -13.1 - 144 -144 = -301.1 v
HDMIULC6-4SC6 technical information 7/11 it?s the reason why some recommendations have to be followed (see section 3.3: how to ensure good esd protection ). figure 9. esd behavior: parasitic phenomena due to unsuitable layout 3.3 how to ensure good esd protection while the HDMIULC6-4SC6 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 v cc to v bus pin, and from gnd plane to gnd pin must be as short as possible to avoid over voltages due to parasitic phenomena (see figure 9 and figure 10 for layout considerations). v bus data line v cl l vbus l i/o l gnd v transil esd surge on data line v f dt di l i/o dt di l i/o dt di l gnd dt di l gnd v cc pin i/o pin gnd pin v bus data line v cl l vbus l i/o l gnd v transil esd surge on data line v f dt di l i/o dt di l i/o dt di l gnd dt di l gnd v cc pin i/o pin gnd pin 0 surge dt di l dt di l v v 0 surge dt di l dt di l v v v gnd i/o f cl gnd i/o f transil cl < - - - = > + + + = - + tr=1ns t v cl- negative surge dt di l dt di l gnd i/o - - dt di l dt di l gnd i/o - - -v f tr=1ns t v cl- negative surge dt di l dt di l gnd i/o - - dt di l dt di l gnd i/o - - -v f v transil +v f tr=1ns t v cl+ dt di l dt di l gnd i/o + positive surge tr=1ns t v cl+ dt di l dt di l gnd i/o + dt di l dt di l gnd i/o + positive surge v transil +v f tr=1ns t v cl+ dt di l dt di l gnd i/o + dt di l dt di l gnd i/o + positive surge tr=1ns t v cl+ dt di l dt di l gnd i/o + dt di l dt di l gnd i/o + positive surge rd.ip v v br transil + = figure 10. esd behavior: layout optimization figure 11. esd behavior: measurement conditions unsuitable layout optimized layout test board vbus esd surge out in hdmiulc6 - 4sc6 hdmiulc6 - 4sc6
technical information HDMIULC6-4SC6 8/11 note: the measurements have been done with the HDMIULC6-4SC6 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 14. crosstalk phenomena 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 r l2 is 2 v g2 , in fact the real voltage at this point has got an extra value 21 v g1 . this part of the v g1 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 ? ). figure 12. remaining voltage after the HDMIULC6-4SC6 during positive esd surge figure 13. remaining voltage after the HDMIULC6-4SC6 during negative esd surge line 1 line 2 v g1 v g2 r g1 r g2 drivers r l1 r l2 receivers + 1 12 v g1 v g2 + 2 21 v g2 v g1
HDMIULC6-4SC6 technical information 9/11 figure 15. analog crosstalk measurements figure 15 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 16 ). figure 16. analog crosstalk results as the HDMIULC6-4SC6 is designed to protect high speed data lines, it must ensure a good transmission of operating signals. the frequency response ( figure 4. ) gives attenuation information and shows that the HDMIULC6-4SC6 is well suitable for data line transmission up to 3.2 gb/s. network analyser port 2 network analyser port 1 test board vbus 100.0k 1.0m 10.0m 100.0m 1.0g - 120.00 - 90.00 - 60.00 - 30.00 0.00 db f (hz)
package information HDMIULC6-4SC6 10/11 4 package information in order to meet environmental requirements, st offers these devices in ecopack? packages. these packages have a lead-free second level interconnect. the category of second level interconnect is marked on the package and on the inner box label, in compliance with jedec standard jesd97. the maximum ratings related to soldering conditions are also marked on the inner box label. ecopack is an st trademark. ecopack specifications are available at: www.st.com. 5 ordering information 6 revision history table 3. sot23-6l dimensions ref. dimensions millimeters inches min. typ. max. min. typ. max. a 0.90 1.45 0.035 0.057 a1 0 0.10 0 0.004 a2 0.90 1.30 0.035 0.051 b 0.35 0.50 0.014 0.02 c 0.09 0.20 0.004 0.008 d 2.80 3.05 0.110 0.120 e 1.50 1.75 0.059 0.069 e0.95 0.037 h 2.60 3.00 0.102 0.118 l 0.10 0.60 0.004 0.024 0 10 0 10 a2 b e d e e l h c a1 ordering code marking package weight base qty delivery mode HDMIULC6-4SC6 dl46 sot23-6l 16.7 mg 3000 tape and reel date revision description of changes 28-mar-2006 1 first issue 26-jul-2006 2 replaced technical information section.
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