Universal Serial Bus
Universal Serial Bus (USB) is an industry staundart developed in the mid-1990s that defines the cables, connectors an communications protocols uised in a bus for connection, communication, an pouer supply atween computers an electronic devices.[2]
 Certified USB logo | |||
| Type | Bus | ||
|---|---|---|---|
| Production history | |||
| Designer | Digital Equipment Corporation, IBM, Intel, Microsoft, NEC an Nortel | ||
| Designed | 1996 | ||
| Manufacturer | Intel, Compaq, Microsoft, NEC, Digital Equipment Corporation, IBM, Nortel | ||
| Supersedit | Serial port, parallel port, gemme port, Apple Desktop Bus, PS/2 connector | ||
| General specifications | |||
| Length | 2–5 m (6 ft 7 in–16 ft 5 in) (bi category) | ||
| Width | 12 mm (A-plug),[1] 8.45 mm (B-plug); 7 mm (Mini / Micro-USB) | ||
| Hicht | 4.5 mm (A-plug),[1] 7.78 mm (B-plug, pre-v3.0); 1.5–3 mm (Mini/Micro-USB) | ||
| Het pluggable | Yes | ||
| Freemit | Yes | ||
| Cable | 4 wires plus shield (pre-3.0); 9 wires plus shield (USB 3.0) | ||
| Pins | 4: 1 supply, 2 data, 1 grund (pre-3.0); 9 (USB 3.0); 11 (powered USB 3.0); 5 (pre-3.0 Micro-USB) | ||
| Connector | Unique | ||
| Electrical | |||
| Signal | 5 volt DC | ||
| Max. voltage | 5.00±0.25 V (pre-3.0); 5.00+0.25-0.55 V (USB 3.0) | ||
| Max. current |
0.5–0.9 A (general); | ||
| Data | |||
| Data signal | Packet data, defined bi specifications | ||
| Width | 1 bit | ||
| Bitrate | 1.5/12/480/5,000/10,000 Mbit/s (dependin on mode) | ||
| Max. devices | 127 | ||
| Protocol | Serial | ||
| Pin out | |||
 | |||
| The staundart USB A plug (left) an B plug (richt) | |||
| Pin 1 | VCC (+5 V) | ||
| Pin 2 | Data− | ||
| Pin 3 | Data+ | ||
| Pin 4 | Ground | ||
References
eedit- ↑ a b "USB 'A' Plug Form Factor Revision 1.0" (PDF). USB Implementers Forum. 23 Mairch 2005. p. 1. Archived frae the original (PDF) on 14 September 2012. Retrieved 4 Apryle 2012.
Body length is fully 12mm in width by 4.5mm in height with no deviations
- ↑ "USB deserves more support", Boston Globe Online, Simson, 31 December 1995, retrieved 12 December 2011