This is a datasheet excerpt for the SMSC USB251x family of USB 2.0 Hi-Speed Hub Controllers. Here's a summary of the key information contained within:

Key Features & Functionality:

️· USB 2.0 Hub Controller: The chip manages USB connections, allowing multiple USB devices to be connected to a single host port.
️· Hi-Speed Support: Supports USB 2.0 Hi-Speed (480 Mbps) data rates.
️· Port Configuration: Supports multiple downstream ports (up to 7 are implied through register maps).
️· Configuration Options: Can be configured via:
- Hardware Strapping: Default settings based on pin configurations.
- EEPROM: Configuration data stored in an external EEPROM.
- SMBus: Configuration via the System Management Bus.
️· Reset Mechanisms: Supports both external hardware reset and USB bus reset.

Document Structure:

The excerpt covers the following areas of the datasheet:

️· Introduction/Overview: (Implied, as it's an excerpt)
️· Pin Lists and Descriptions: Details the function of each pin on the chip.
️· Register Maps: Explains the configuration registers used to control the hub's operation.

️· DC and AC Electrical Characteristics: Specifies the operating voltage, current, and timing requirements for the chip.
️· Package Information: Describes the different package options available (QFN 36, 48, 64-pin).
️· List of Tables: A comprehensive list of all tables within the document.

Key Tables Included:

️· Pin Lists: Detailed lists of the pins, their types (input, output, bidirectional), and a description of their function.
️· Register Maps: Defines the address and function of each register used to configure the hub controller. This is critical for programming and customizing the hub’s behavior.
️· DC Electrical Characteristics: Specifies voltage and current limits for safe operation.
️· AC Specifications: Provides timing parameters.
️· Reset Timing: Tables detailing reset timing.



In essence, this excerpt provides the essential technical information for engineers designing with the SMSC USB251x hub controller. It details how to connect the chip, configure it, and ensure it operates within its specifications.