USB 2.0 Extender Control Chip CH317


CH317 is a USB2.0 extender control chip, which breaks through the limit of USB transmission distance of no more than 5 meters. It extends USB signals by more than 100 meters through low-cost network cables, uses optical fiber lines, extends distances up to km. It supports USB high-speed, full-speed, low-speed, hot-swappable devices, and does not need to install drivers, is compatible with all OSs. CH317 also supports HUB expansion, switch penetration, and can be widely used in computer peripherals, industrial control, medical equipment, security monitoring, etc.

The scheme is a dual-chip scheme, which is composed of CH317 plus a third-party Gigabit Ethernet PHY or optical fiber interface PHY and peripheral auxiliary components. According to different transmission media, it can be divided into two types: network cable extension and optical fiber extension.

The application block diagram is as follows:

Figure 1 Block diagram of network cable extension scheme

System Block Diagram

Figure 2 Block diagram of optical fiber extension scheme

System Block Diagram


  • Support USB2.0 high-speed, plus HUB chip can support low/full-speed device.
  • Support USB control transfer, bulk transfer, interrupt transfer, synchronous/isochronous transfer.
  • Support USB-HUB expansion, USB printer, scanner, camera, U disk, keyboard, mouse, etc.
  • Auto identify USB High-Speed, Full-Speed or Low-Speed devices.
  • No need to install additional software, compatible with all OSs.
  • Support hot-swappable USB devices, plug and play.
  • Support standard RGMII interface Gigabit PHY, the transmission distance depends on the cable, support network cable extension, typically up to 100 meters for Cat5e cables, 170 meters for Cat6 cables, and 6 km for fiber optic extension. USB non-real-time transmission can reach over 10 kilometers.
  • With Gigabit PHY chip, it can realize transformer isolation or optical isolation of USB2.0 high-speed signal.
  • Support switch penetration, extended by adding network cable through the switch, or integrated with other support network transmission signals.
  • Support 2 sets of I/O synchronous extension control, enable remote power on/off and restart functions.
  • 12M clock output, which can be used for clock input of HUB chip.
  • The same chip can auto identify whether to enter Host or Device mode, without configuration.
  • 3.3V single power external input, support 2.5VRGMII interface voltage.
  • Support USB2.0 high-speed, plus HUB chip can support low/full-speed devices.

relation files

file name file content
CH315DS1.PDF CH315 datasheet. CH315G is a USB1.1 extension cable control chip. The extension distance of network cable can be up to 300 meters. CH315H is a USB signal isolation control chip, used for optoelectronic isolator.
CH317DS0.PDF CH317 datasheet, USB2.0 extender control chip, for USB more than 100 meters extension, support HUB extension, pure hardware solution, no driver installation.
CH9350DS.PDF CH9350 datasheet. A controller chip that realizes USB keyboard/mouse to UART communication. The transmission distance is extended through UART. It is convenient for KVM products to manage and control USB keyboard and USB mouse remotely.
CH374DS1.PDF CH374 datasheet. CH374 is a USB-HOST&DEVICE general interface chip. It supports USB host and USB device, supports 12M USB full-speed communication and 1.5M low-speed communication, supports 8-bit parallel interface or SPI interface, supports all types of USB transmission and Hub operation, etc.
CH341DS1.PDF CH341 datasheet, USB bus converter chip with multiple communication interfaces, such as USB to serial port/parallel port/printer port/I2C interface etc. Drivers support for Windows/Linux/Android/Mac, etc. The datasheet is the description of USB to serial port and printer port.
CH375DS1.PDF CH375 datasheet. Easy-to-use USB-HOST&DEVICE general interface chip, supports host-slave USB applications and dynamic switch, has built-in communication protocol firmware, and provides USB flash disk file system library. This datasheet introduces the physical sector operation of the USB flash disk in USB host mode.