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Text of the page (random words):
view source for usb wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in view source for usb add languages article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file page information get shortened url switch to legacy parser in other projects wikidata item appearance move to sidebar hide usb you do not have permission to edit this page for the following reason this ip address range has been globally blocked this does not affect your ability to read wikipedia pages most people who see this message have done nothing wrong some kinds of blocks restrict editing from specific service providers or telecom companies in response to recent abuse or vandalism and can sometimes affect other users who are unrelated to that abuse review the information below for assistance if you do not believe that you have done anything wrong this block affects editing on all wikimedia wikis the ip address or range 5 135 0 0 16 has been globally blocked by jon kolbert for the following reason s open proxy webhost visit the faq if you are affected this block will expire on 04 29 8 january 2027 your current ip address is 5 135 42 194 even while globally blocked you will usually still be able to edit pages on meta wiki if you believe you were blocked by mistake you can find additional information and instructions in the stewards block wizard other useful links global blocks help i have been blocked you can view and copy the source of this page span class anchor id host span low power and high power devices this section describes the power distribution model of usb that existed before usb power delivery usb pd on devices that do not use bc or pd usb provides up to 4 5 w through type a and type b connectors and up to 15 w through usb c all pre pd usb power is provided at 5 v for a host providing power to devices usb has a concept of the unit load any device may draw power of one unit and devices may request more power in these discrete steps it is not required that the host provide requested power and a device may not draw more power than negotiated low power devices can draw no more than one unit all devices must act as low power devices when starting out as unconfigured for usb devices up to usb 2 0 a unit load is 100 ma or 500 mw while usb 3 0 defines a unit load as 150 ma 750 mw full featured usb c can support low power devices with a unit load of 250 ma or 1250 mw high power devices e g typical 2 5 inch hard disk drives can draw more than one unit usb up to 2 0 allows a host or hub to provide up to 2 5 w to each device in five discrete steps of 100 ma and superspeed devices usb 3 x allows a host or a hub to provide up to 4 5 w in six steps of 150 ma usb c allows for dual lane operation of usb 3 x with larger unit load 250 ma up to 7 5 w ref cite web title usb 3 2 revision 1 1 url https usb org document library usb 32 revision 11 june 2022 access date 2024 12 31 website usb org publisher usb implementers forum at p 470 section 11 4 5 vbus electrical characteristics date june 2022 ref usb c also allows for type c current as a replacement for usb bc signaling power availability in a simple way without needing any data connection ref cite web title usb type c cable and connector specification release 2 4 usb if url https usb org document library usb type cr cable and connector specification release 24 access date 2024 12 31 website usb org publisher usb implementers forum at p41 sec 2 4 vbus ref class wikitable sortable style margin 0 0 1em 1em usb power standards specification max current voltage max power low power device up to usb 2 0 right 100 ma right 5 v efn name vdrop the v sub bus supply from a low powered hub port may drop to 4 40 v right 0 50 w low power superspeed usb 3 x device right 150 ma right 5 v efn name vdrop right 0 75 w high power device up to usb 2 0 right 500 ma efn up to five unit loads with non superspeed devices one unit load is 100 ma right 5 v right 2 5 w high power superspeed usb 3 x single lane device right 900 ma efn up to six unit loads with superspeed devices one unit load is 150 ma right 5 v right 4 5 w high power superspeed usb 3 x dual lane device efn name usbconly for usb c only right 1 5 a efn name vml up to six unit loads with multi lane devices one unit load is 250 ma right 5 v right 7 5 w battery charging bc right 1 5 a right 5 v right 7 5 w type c right 1 5 a 3 a right 5 v right 7 5 w 15 w usb power delivery power delivery abbr spr standard power range efn name usbconly right 5 a efn name req_5a_cable 3 a 60 w operation requires an electronically marked cable rated at 5 a right up to 20 v right 100 w power delivery abbr epr extended power range efn name usbconly right 5 a efn name req_5a_cable right up to 48 v efn name req_epr_cable 20 v 100 w operation requires an electronically marked extended power range epr cable right 240 w colspan 4 notelist to recognize battery charging mode a dedicated charging port places a resistance not exceeding 200 ω across the d and d terminals shorted or near shorted data lanes with less than 200 ω of resistance across the d and d terminals signify a dedicated charging port dcp with indefinite charging rates ref name usbbc1 2 cite web url http www usb org developers docs devclass_docs bcv1 2_070312 zip title battery charging specification revision 1 2 date 7 december 2010 access date 29 march 2016 publisher usb implementers forum url status dead archive url https web archive org web 20160328102350 http www usb org developers docs devclass_docs bcv1 2_070312 zip archive date 28 march 2016 page 45 ref ref cite web title overview of usb battery charging revision 1 2 and the important role of adapter emulators url https pdfserv maximintegrated com en an tut5801 pdf publisher maxim integrated page 3 date 2014 access date 12 august 2021 archive date 4 july 2021 archive url https web archive org web 20210704221311 https pdfserv maximintegrated com en an tut5801 pdf url status live ref in addition to standard usb there is a proprietary high powered system known as poweredusb developed in the 1990s and mainly used in point of sale terminals such as cash registers return to usb retrieved from https en wikipedia org wiki usb privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search view source for usb add languages add topic