The Microchip USB251xB/xBi hub is a family of lowpower, 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 Microchip hub supports lowspeed, full-speed, and hi-speed (if operating as a hispeed hub) downstream devices on all of the enabled downstream ports. Highlights • High performance, low-power, small footprint hub controller IC with 2, 3, or 4 downstream ports • Fully compliant with the USB 2.0 Specification [1] • Enhanced OEM configuration options available through either a single serial I2C EEPROM, or SMBus slave port • MultiTRAKTM - High-performance multiple transaction translator which provides one transaction translator per port • PortMap - Flexible port mapping and disable sequencing • PortSwap - Programmable USB differential-pair pin locations ease PCB design by aligning USB signal lines directly to connectors • PHYBoost - Programmable USB signal drive strength for recovering signal integrity using 4-level driving strength resolution 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 or external 24 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) • The USB251xB/xBi offers the following packages: - 36-pin SQFN (6x6 mm) (Preferred) - 36-pin QFN (6x6 mm) (Legacy) • USB251xBi products support the industrial temperature range of -40oC to +85oC • USB251xB products support the extended commercial temperature range of 0oC to +85oC

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