USB6BX ? usb port protection september 1998 ed : 4a application specific discretes a.s.d. ? so8 dil8 functional diagram usb connector vbus d+ d- gnd features fulldiodebridgewith integratedclamping protection breakdown voltage : v br = 6v min. peakpulsepowerdissipation: p pp = 500w(8/20 m s) verylow capacitance,compatible with usb data rate. description in order to prevent fast transients from leading to severe damages in a usb system, a specific pro- tection has been developed by sgs-thomson mi- croelectronics. the USB6BX protects the two data wires against esd discharge. besides, this device also keeps the power rails in a safe limit thanks to the inte- grated transil ? diode. benefits provides protection for each dataline and be- tween v bus supply and gnd : 25a , 8/20 m s. high esd protection level : up to level 3 per mil std 883c-method 3015-6 separated inputs and outputs (so-called 4-point structure) to improve esd susceptibility. comprehensive package pin-out for immediate implementation. complieswith the following standards: mil std 883c - method 3015-6 class 3 c = 100 pf r = 1500 w 3 positive strikes and 3 negative strikes (f = 1 hz) iec-1000-4-2 level 4 15 kv (air discharge) 8 kv (contact discharge) tm: asd and transil are trademarks of sgs-thomson microelectronics. 1/6
1. universal serial bus the new data transmission standard, universal serial bus (usb) is being driven by market leaders in the world of computer and telecommunica- tions, including compaq, dec, ibm, intel, mi- crosoft, nec and nortel, and will become the leading transmission protocol within the next few years. this standard mainly provides simplified intercon- nectivity. specialized ports on the back of the pre- sent pc will largely be replaced by usb ports. many peripherals such as printers, keyboards, monitors and joysticks will also host usb ports. the usb offers high speed communication rates up to 12 mbit/s. only two wires (d+, d-) are re- quired for data transfer. additionally, limited amount of power for usb devices located on the downstream can also be transmitted on two sepa- rate conductors within the same cable. 2. protection to support usb designers dealing with the usb chips are con- cerned about electrostatic discharge sensitivity (esd) of their usb controller ics. the usb controller is more than just a driver / re- ceiver; it acts as a microcontroller which manages power and direct signal traffic. this complexity in- creases its cost over conventional devices. there- fore, a failure of a usb port could result in costly computer failure. in order to prevent these fast transients from lead- ing to severe damages in a system, a specific pro- tection has been developed by sgs thomson microelectronics. the USB6BX protects not only the two wires of data transmission, but also keep the power rails in a safe limit. the USB6BX includes four diodes and one clamp- ing device. technical information the capacitance between the i/o transmission wires provides no significant signal distortion at the 12 mbit/s data rate, thus allowing full compatibility with usb standard. available either in a compact so8 or in a through- hole dil8 package, this protective element re- quires minimal board space and eases the pcb layout thanks to its direct compatibility with the usb connector pin-out. fig. 1 : recommended configuration 1 vbus d+ d- gnd usb output connector usb ic USB6BX 2/6
symbol parameter value unit min. typ. max. v br breakdown voltage between v bus and gnd i r =1ma 6 v i rm leakage current vrm=5.25v 10 m a c capacitance between pins d+ and d- v signal =30mv, f=1mhz, v d =0v v cc not connected 15 pf capacitancebetweenpins d+ (or d-) andgnd v signal =30mv, f=1mhz, v d =5v v cc =5v 25 pf electrical characteristics (t amb =25 c) symbol parameter value unit v pp peak pulse voltage iec1000-4-2 contact discharge iec1000-4-2 air discharge mil std883c-method 3015-6 8 15 4 kv p pp peak pulse power 8/20 m s 500 w i pp peak pulse current 8/20 m s25a t stg t j storage temperature range maximum junction temperature - 55 to + 150 + 150 c c t l lead solder temperature (10s duration) 260 c absolute maximum ratings (t amb =25 c) USB6BX 3/6
-40 -20 0 20 40 60 80 100 120 140 160 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 ppp[tj initial]/ppp[tj initial=25 c] tj initial( c) fig 1: peak power dissipation versus initial junc- tion temperature. -40 -20 0 20 40 60 80 100 120 140 0.90 0.95 1.00 1.05 1.10 vbr[tj] / vbr[tj=25 c] tj( c) fig 3: relative variation of breakdown voltage ver- sus junction temperature (typical values). -40 -20 0 20 40 60 80 100 120 140 0.1 1.0 10.0 ir[tj] / ir[tj=25 c] tj( c) fig 2: relative variation of leakage current versus junction temperature (typical values). USB6BX 4/6
order code usb 6 b1 rl v br min packaging: rl = tape and reel.(so8 only) = tube universal serial bus ref. dimensions millimetres inches min. typ. max. min. typ. max. a 1.75 0.069 a1 0.1 0.25 0.004 0.010 a2 1.65 0.065 a3 0.65 0.85 0.025 0.033 b 0.35 0.48 0.014 0.019 b1 0.19 0.25 0.007 0.010 c 0.25 0.50 0.50 0.010 0.020 c1 45 (typ) d 4.8 5.0 0.189 0.197 e 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 3.81 0.150 f 3.8 4.0 0.15 0.157 l 0.4 1.27 0.016 0.050 m 0.6 0.024 s8 (max) package: 1 = so8 2 = dil8 package mechanical data. so8 plastic l e d 8 4 5 1 m s c1 e b e3 a c a1 b a3 1 a2 f USB6BX 5/6
information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringementof patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specifications mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics products are not authorized for use as critical components in life support devices or systems without express written ap- proval of stmicroelectronics. the st logo is a registered trademark of stmicroelectronics ? 1998 stmicroelectronics - printed in italy - all rights reserved. stmicroelectronics group of companies australia - brazil - canada - china - france - germany - italy - japan - korea - malaysia - malta - mexico - morocco - the netherlands - singapore - spain - sweden - switzerland - taiwan - thailand - united kingdom - u.s.a. package mechanical data. dil8 plastic 8 1 5 4 e d f b1 b e3 e z z b i l a1 ref. dimensions millimetres inches min. typ. max. min. typ. max. a1 0.51 0.020 b 0.85 1.40 0.033 0.055 b 0.5 0.020 b1 0.38 0.50 0.015 0.020 d 10.15 0.399 e 8.10 8.80 9.40 0.319 0.346 0.370 e 2.54 0.100 e3 7.62 0.300 f 7.1 0.280 i 5.1 0.200 l 3.3 0.130 z 1.50 0.063 types package weight marking order code base qty usb6b1 so8 0.077g usb6 usb6b1 100 pcs (tube) usb6b1rl 2500 pcs (tape and reel) usb6b2 dil8 0.59g usb6 usb6b2 50 pcs (tube) marking USB6BX 6/6
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