Datasheet
Table Of Contents
- Chapter 1 USB251x Hub Family Differences Overview
- Chapter 2 General Description
- Chapter 3 Acronyms
- Chapter 4 Block Diagram
- Chapter 5 Pin Descriptions
- Chapter 6 LED Usage Description
- Chapter 7 Battery Charging Support
- Chapter 8 Configuration Options
- Chapter 9 DC Parameters
- 9.1 Maximum Guaranteed Ratings
- 9.2 Operating Conditions
- Figure 9.1 Supply Rise Time Model
- Table 9.1 DC Electrical Characteristics (continued)
- Table 9.2 Supply Current Unconfigured: Hi-Speed Host (ICCINTHS)
- Table 9.3 Supply Current Unconfigured: Full-Speed Host (ICCINTFS)
- Table 9.4 Supply Current Configured: Hi-Speed Host (IHCH1)
- Table 9.5 Supply Current Configured: Full-Speed Host (IFCC1)
- Table 9.6 USB251x/xi/xA/xAi Supply Current Suspend (ICSBY)
- Table 9.7 USB251xB/xBi Supply Current Suspend (ICSBY)
- Table 9.8 USB251x/xi/xA/xAi Supply Current Reset (ICRST)
- Table 9.9 USB251xB/xBi Supply Current Reset (ICRST)
- Table 9.10 Pin Capacitance for USB251x, USB251xi, USB251xA, USB251xAi
- Table 9.11 Pin Capacitance for USB251xB and USB251xBi
- 9.2.1 Package Thermal Specifications
- Chapter 10 AC Specifications
- Chapter 11 Package Outlines
USB 2.0 Hi-Speed Hub Controller
Datasheet
SMSC USB251x 9 Revision 1.1 (04-26-10)
DATASHEET
Supports custom string descriptors (up to 31 characters):
- Product string
- Manufacturer string
- Serial number string
When available, pin selectable options for default configuration may include:
-Downstream ports as non-removable ports
-Downstream ports as disabled ports
-Downstream port power control and over-current detection on a ganged or individual basis
-USB signal drive strength
-USB differential pair pin location
For more information, please contact your sales representative to obtain a copy of the latest Battery
Charging white paper.
USB251xB/xBi products are fully footprint compatible with USB251x/xi/xA/xAi products:
-pin-compatible
-direct drop-in replacement
-use the same PCB components
-USB-IF Compliance by Similarity for ease of use and a complete cost reduction solution
-PIDs, DIDs, and other register defaults may differ and can be configured to match the OEM’s needs. Please
see Table 8.2, "Internal Default, EEPROM and SMBus Register Memory Map" for details.
Table 2.1 Summary of Compatibilities between USB251xB/xBi and USB251x/xi/xA/xAi Products
Part
Number
Drop-in
Replacement
PACKAGE
USB2512 USB2512B
36QFN
USB2512i USB2512Bi
USB2512A USB2512B
USB2512Ai USB2512Bi
USB2513 USB2513B
USB2513i USB2513Bi
USB2514 USB2514B
USB2514i USB2514Bi