FUNCTION OVERVIEW
The GLI650USB is a 5 port USB hub with 1 upstream port and 4 downstream ports. It uses an 8-bit RISC-like uC to encode/decode the host commands. The GL650USB is designed mainly for stand-alone hub and can also be integrated in PC motherboard or any other devices to support USB hub function. The GL650USB can switch between self power and bus-power automatically without re-plug in. The GL650USB can be configured as individual mode or ganged mode for the power management of downstream port devices. To prevent from abnormal current consumption of downstream port devices, the GL650USB supplies power enable flags by reading the over-current flags. The GL650USB supports smart traffic indication through the LED lighting. The higher data traffic flows through one port, the higher frequency of that port’s LED blinks. To minimize the power consumption, the GL650USB will turn LED off and stop the clock when they are suspended.

FEATURES
· High performance and low-cost solution for USB hub
· USB Specification Compliance
   - Conforms to USB specification Rev. 1.1
   - Supports 1 device address and 2 endpoints
· 8-bit micro-processor
   - RISC-like architecture
   - USB optimized instruction set
   - Single cycle instruction execution
   - Operation Speed: DC to 24 MHz clock input
   - Performance: 12 MIPS @ 24MHz
· I/O ports
   - 4-port hub
· Internal memory
   - 64 bytes of RAM
   - 1.75K ´ 14 of program ROM
· On-chip 3.3v output
   - No external regulator required
· Integrated USB transceiver
· 12 MHz external clock
· Improved output drivers with slew-rate control to reduce EMI
· Internal power-on reset(POR)
· Internal power-fail detector for ESD recovery
· Support suspend/normal mode power management
· Support power management for downstream port devices
· Automatic switching between self/bus powered mode
· Smart LED traffic indicator
   - The higher data traffic flows through one port, the higher frequency that port’s LED will blink.
· Applications:
   - Stand-alone USB hub
   - PC motherboard USB hub
· 48 pin LQFP package