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]
Quick Facts Type, Designer ...
Universal Serial Bus (USB)
 Certified USB logo |
| Type |
Bus |
|---|
| 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 |
|---|
| 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 |
|---|
| 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 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 |
|---|
 |
|
The staundart USB A plug (left) an B plug (richt) |
| Pin 1 |
|
VCC (+5 V) |
|---|
| Pin 2 |
|
Data− |
|---|
| Pin 3 |
|
Data+ |
|---|
| Pin 4 |
|
Ground |
|---|
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