 USB251x
High-Performance, Low-Power, Small Footprint USB 2.0 Hub Controller Family for PC, Embedded and Consumer Applications
General Description
SMSC’s USB251x is a family of versatile, cost-effective, and power-efficient USB 2.0 hub controllers. Leveraging innovative MultiTRAK™ technology that delivers industry-leading data throughput in mixed-speed USB environments, the USB251x family is a USB port expansion solution for applications that demand low power and small footprint without compromising on performance.
Designed with consumer and mobile applications in mind, all members of the USB251x family are available in space-saving packages. The common 36-pin package shared among all USB251x controllers measures only 6x6 mm and provides an ultra small footprint for space-constrained designs while allowing scalable port expansion from two to four ports. The USB251x family is highly configurable to meet minimalist and feature-rich system requirements. Over 30 programmable features including SMSC’s unique PortMap, PortSwap, TrueSpeed and PHYBoost are designed to aid system designers in simplifying PCB layout and optimizing bill-of-material cost. For applications requiring extended operating temperature range, the USB251x i-temp series is designed to meet -40° to 85°C industrial temperature requirements.
Hardware Features
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MultiTRAK - per-port Transaction Translator for best data throughput in mixed-speed USB environment |
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Low power operation |
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Full power management with individual or ganged configuration |
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Power control of each downstream port |
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On-chip Power On Reset (POR) |
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Internal 1.8V voltage regulator |
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Fully integrated USB termination and pull-up/pulldown resistors |
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On board 24MHz crystal driver or external 24 MHz clock input |
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TrueSpeed - USB host/device speed indicator; per-port 3-color LED drivers that indicate the speed of USB host and device connection - high-speed (480 Mbps), full-speed (12 Mbps), low-speed (1.5 Mbps)
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Enhanced EMI rejection and ESD protection |
OEM Selectable Features
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Customize Vendor ID, Product ID, and Device ID |
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Select whether the hub is part of a compound device (when any downstream port is permanently hardwired to a USB peripheral device, the hub is part of a compound device) |
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PortMap - flexible port mapping and disable sequence; ports can be disabled/reordered in any order to support multiple product SKUs; hub will automatically reorder the remaining ports to match the Host controller's numbering scheme |
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PortSwap - Programmable USB differential-pair pin location; eases PCB layout by aligning USB signal lines directly to connectors |
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PHYBoost - Programmable USB signal drive strength; recovers USB signal integrity due to compromised system environment using 4-level driving strength resolution |
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Select the presence of a permanently hardwired USB peripheral device on a port by port basis |
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Configure the delay time for filtering the over-current sense inputs |
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Configure the delay time for turning on downstream port power |
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Configure the polarity of downstream port power control signals |
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Indicate the maximum current that the 4-port hub consumes from the USB upstream port |
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Indicate the maximum current required for the hub controller |
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Supports custom string descriptor up to 31 characters in length for:
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Product string |
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Manufacturer string |
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Serial number string |
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Pin selectable options for default configuration
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Select downstream ports as non-removable ports |
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Select downstream ports as disabled ports |
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Select downstream port power control and over-current detection on a ganged or individual basis |
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Select downstream port power control polarity |
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Select USB signal drive strength |
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Select USB differential pair pin location |
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Select on-chip or off-chip voltage regulator mode |
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Target Applications
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Mobile PC Docking Stations |
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LCD Monitors/TVs |
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PC Motherboards |
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Gaming Consoles |
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Multi-Function Printers |
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Cable/DSL Modems |
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Set-Top Boxes |
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DVD/CD-ROM/DVR |
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HDD Enclosures |
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Keyboards |
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KVM Switches |
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Server Front Panels |
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Point-of-Sale (POS) Systems |
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IP Telephony |
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Automobile/Home Audio Systems |
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Thin Client Terminals |
USB251x Selector Guide
| Feature | USB2512 | USB2512i | USB2513 | USB2513i | USB2514 | USB2514i |
| Number of Downstream Ports | 2 | 2 | 3 | 3 | 4 | 4 |
| MultiTRAK Technology | | |  | | | |
| PortMap | | | | | | |
| PortSwap | | | | | | |
| TrueSpeed | | | | | | |
| PHYBoost | | | | | | |
| I2C/SMBus | | | | | | |
| -40° to 85° C | | | | | | |
| 36 QFN (6x6x0.9 mm) | | | | | | |
| 48 QFN (7x7x0.85 mm) | | | | | | |
| RoHS Compliant | | | | | | |
Ordering Information and Datasheets
| Part Number | Package Type* | Order Number | Data Brief | Datasheet |
| USB2512 | 36 QFN | USB2512-AEZG | 2512db.pdf
File Size = 395K | 2512.pdf
File Size =814K |
| USB2512i | 36 QFN | USB2512i-AEZG | 2512idb.pdf
File Size = 393K | 2512i.pdf
File Size = 816K |
| USB2513 | 36 QFN
48 QFN | USB2513-AEZG
USB2513-HZH | 2513db.pdf
File Size = 452K | 2513.pdf
File Size = 959K |
| USB2513i | 36 QFN
48 QFN | USB2513i-AEZG
USB2513i-HZH | 2513idb.pdf
File Size = 451K | 2513i.pdf
File Size = 959K |
| USB2514 | 36 QFN
48 QFN | USB2514-AEZG
USB2514-HZH | 2514db.pdf
File Size = 452K | 2514.pdf
File Size = 965K |
| USB2514i | 36 QFN
48 QFN | USB2514i-AEZG
USB2514i-HZH | 2514idb.pdf
File Size = 454K | 2514i.pdf
File Size = 972K |
*Note: All USB251x family products come in lead free RoHS compliant packages.
USB251x Application Notes, Drivers and Design Tools
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