The difference between USB3.0 and USB2.0

What is USB3.0

USB3.0 is a USB3.0 promotion team composed of industry giants such as Intel, Microsoft, Hewlett-Packard, Texas Instruments, NEC, ST-NXP, etc. announced on November 18, 2008 that it has officially completed and publicly released the USB3.0 standard. The USB3.0 standard provides ten times the transmission speed and higher energy-saving efficiency of USB 2.0, and can be widely used in PC peripherals and consumer electronics products.

The difference between USB3.0 and 2.0

1. The data bandwidth of USB3.0 is ten times that of USB2.0, which can reach 5Gb / s (480MB / s), and the synchronous transmission bandwidth can also reach 384MB / s, which is one of the main differences between USB3.0 and 2.0;

2. Low power consumption (about 20% lower power consumption than USB2.0 at 20MB / s data transfer);

3. USB3.0 is more energy-saving than 2.0, for devices that are temporarily in a waiting state, you can use the power-saving mode;

4. USB3.0 can provide more power through the cable (2.5W to 4.5W);

5. USB3.0 is backward compatible and supports USB2.0 devices, but USB2.0 cannot support USB3.0.

While maintaining compatibility with USB 2.0, the new USB 3.0 also provides the following enhancements:

Greatly improved bandwidth-up to 5Gbps full duplex (USB2.0 is 480Mbps half duplex)

Achieve better power management

It enables the host to provide more power to the device, enabling applications such as USB-rechargeable batteries, LED lighting, and mini fans.

Can make the host identify the device faster

New protocol makes data processing more efficient

USB 3.0 can transfer large-capacity files (such as HD movies) at the storage rate defined by the storage device. For example, a flash drive using USB 3.0 can transfer 1GB of data to a host in 3.3 seconds, while USB 2.0 takes 33 seconds.

Driven by the ever-increasing demand for resolution and storage performance of consumer electronics devices, it is hoped that wider media applications can be achieved through broadband Internet connections. Therefore, users need faster transmission performance to simplify downloading, storage, and mass multimedia Content sharing. USB 3.0 has played a vital role in providing consumers with the simple connectivity they need.

When used in consumer devices, USB 3.0 will solve the problem that USB 2.0 cannot recognize batteryless devices. The host can slowly reduce the current through USB 3.0 to identify these devices, such as a mobile phone with a broken battery.

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