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LC-22LE250
LC-24LE250
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/pull down 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
- Supports the USB Battery Charging specification Rev. 1.1 for Charging Downstream Ports
(CDP).
- 36-pin QFN (6x6 mm) Lead-free RoHS compliant package.
- USB251xBi products support the industrial temperature range of -40ºC to +85ºC
- USB251xB products support the extended commercial temperature range of 0ºC to +85ºC.
c) Applications
-LCD monitors and TVs
-Multi-function USB peripherals
-PC motherboards
-Set-top boxes, DVD players, DVR/PVR
-Printers and scanners
-PC media drive bay
-Portable hub boxes
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