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]

Universal Serial Bus (USB)

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); 5 A (charging devices)
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