Universal Serial Bus

USB Cable Interface


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USB Cable Diagram 2.0

This page covers USB 2.0 and below, refer here for USB 3.0

USB Cable

Cable is 4 wire. The data wires are 28 AWG, the power wires are 20 to 28 AWG.
Two power lines are un-twisted and 2 data lines, twisted. Longer cables will use 20 AWG for power.
The wire are color coded per the drawing above. Cables will have an A plug on one end an a B plug on the opposite end.
The maximum cable length is 5 meters; however that can be increased by using Hubs.
The USB interface is designed to operate down to -20 degrees C.

APC

RAM Electronics Industries Inc
{USB Converters / Adaptors / Cable Assemblies}

icron
{Extreme USB - USB Converter, Hub/Hub allows USB up to 100 meters}

USB Pinout

USB Type A Connector


USB Pinout, Cable Assembly
Pin Signal Name Description
1 VBUS Red
2 D- White
3 D+ Green
4 GND Black
Shell Shield Drain

The USB pinout is the same for either a type A or B connector, the difference is in the shape



USB Connector Styles

Possible transition cable assemblies include; USB to IEEE488, USB to GPIB, USB to RS232, USB to RS422

Engineering Design Key words: USB, Universal Serial Bus, Transceiver, Physical Layer, Description, Products, USB pinout,
PHY, Electrical, 2-wire, Pin Out, Electrical Standard, Interface Standard, Specification, Spec, Circuit layout, Electrical Interface,
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Last Modified 11/7/09
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