GL652USB 7 PORT USB HUB CONTROLLER
1 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
− 7-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
2
08/18/00
Revision 1.2