The GL857L is a USB 2.0 Hub Controller manufactured by Genesys Logic. It is a highly integrated, single-chip solution designed to add USB ports to various electronic devices and systems. This chip complies with the USB 2.0 specification, providing high-speed data transfer rates up to 480Mbps.

Applications

• USB Hubs: The primary application is creating standalone USB hubs for expanding the number of available USB ports on a computer or other device.
• Motherboards: Integrated onto computer motherboards to provide additional USB ports for peripherals.
• Laptop Computers: Used in laptops to expand the number of USB ports, offering connectivity for multiple devices.
• Embedded Systems: Incorporated into embedded systems that require USB connectivity, such as industrial control systems or point-of-sale terminals.
• Docking Stations: Employed in docking stations to provide USB connectivity for peripherals when a laptop is connected.

Features

• USB 2.0 Compliant: Fully compliant with the USB 2.0 specification, supporting high-speed (480Mbps), full-speed (12Mbps), and low-speed (1.5Mbps) data transfer rates.
• 4 Downstream Ports: Typically provides four downstream USB ports for connecting various USB devices.
• Integrated USB Transceivers: Includes integrated USB transceivers, reducing the need for external components and simplifying circuit design.
• Integrated Upstream Resistor: Features an integrated upstream resistor, simplifying the connection to the host controller.
• Individual Port Power Management: Supports individual port power management, allowing for power saving by disabling unused ports.

Benefits

• Increased USB Connectivity: Expands the number of available USB ports, allowing users to connect more devices simultaneously.
• High-Speed Data Transfer: Supports high-speed USB 2.0 data transfer rates, enabling fast data transfer between devices.
• Simplified Design: Highly integrated design reduces the number of external components required, simplifying circuit design and reducing board space.
• Power Efficiency: Individual port power management enables power saving, reducing overall system power consumption.
• Cost-Effective Solution: Provides a cost-effective solution for adding USB ports to various electronic devices and systems.

Additional Details

The GL857L typically supports bus-powered and self-powered modes. It has built-in over-current protection to prevent damage to the hub and connected devices. The specific package type and operating temperature range can be found in the Genesys Logic datasheet for this part number. The chip communicates with the host controller via the USB interface, handling all the necessary USB protocol and timing requirements.