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Figure 10: USB description
USB2512B
a) General Description
The SMSC USB251xB/xBi hub is a family of low-power, configurable, MTT (multi
transaction translator) hub controller IC products for embedded USB solutions. The x in the
part number indicates the number of downstream ports available, while the B indicates battery
charging support. The SMSC hub supports lowspeed, full-speed, and hi-speed (if operating as
a hispeed hub) downstream devices on all of the enabled downstream ports.
b) Features
- USB251xB/xBi products are fully footprint compatible with USB251x/xi/xA/xAi
products as direct drop-in replacements
• Cost savings include using the same PCB components and application of
USB-IF Compliance by Similarity
- Full power management with individual or ganged power control of each downstream
port
- Fully integrated USB termination and pull-up/pulldown resistors
- Supports a single external 3.3 V supply source; internal regulators provide 1.2 V
internal core voltage
- Onboard 24 MHz crystal driver, ceramic resonator, or external 24/48 MHz clock input
- Customizable vendor ID, product ID, and device ID
- 4 kilovolts of HBM JESD22-A114F ESD protection (powered and unpowered)
- Supports self- or bus-powered operation
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