USB2642-I/ML

Specialized Overview

The USB2642 is a single-chip USB 2.0 compliant hi-speed hub and flash media card reader combo solution by Microchip Technology. It integrates a 2-port USB hub with an internally attached SD/MMC flash media interface on a third downstream port, functioning as a USB compound device. The controller supports sustained transfer rates exceeding 35 MB/s for flash media including SD, SDHC, SDXC, MMC, and eMMC formats. It features an I2C over USB bridge for controlling external I2C devices at 50 kHz. The device operates in commercial (0°C to +70°C) or industrial (-40°C to +85°C) temperature ranges and is housed in a 48-pin 7x7 mm² QFN package.

Specialized Feature Summary

• Integrates a dual-port USB 2.0 hub with a dedicated SD/MMC flash media reader/writer interface on a third port.
• Supports flexible port mapping, programmable differential-pair pin swapping, and adjustable transceiver drive strength for signal integrity.
• Enables control of external I2C slave devices via a host-accessible bridge operating at 50 kHz serial clock.
• Allows configuration via internal firmware, external SPI ROM for code execution, or external I2C EEPROM for custom identifiers.

Specialized Applications

• Desktop and mobile PCs
• Monitors and televisions
• Mobile PC docking stations
• Consumer A/V equipment
• Flash media card readers/writers

Specialized Procurement Notes

Verify the specific ordering suffix matches the required temperature range and package variant. Confirm that the source document explicitly defines any suffix characters; do not assume functional changes based on suffixes alone. Ensure the component version aligns with the latest datasheet revision DS00001578F to account for potential silicon errata or documentation updates prior to procurement.

Specialized Selection Notes

Select this component when a design requires both USB expansion and direct flash media access within a single integrated circuit. Consider the PortSwap feature if PCB trace alignment to connectors is critical, and utilize PHYBoost if signal integrity issues are anticipated in the layout. Ensure the system supports the required 24 MHz crystal oscillator and appropriate power regulation for the 1.8 V core voltage.

Specialized Part Context

The USB2642 serves as a converged solution for systems needing USB connectivity alongside local storage access. By combining a hi-speed hub controller with an SD/MMC interface, it reduces board space and component count compared to discrete solutions. It is designed for platforms where cost-effectiveness and energy efficiency are prioritized while maintaining compliance with USB 2.0 standards.

Specialized Replacement Considerations

No public confirmed substitute part numbers are documented in the provided datasheet. Designers should consult Microchip Technology directly for alternative components or updated product line information.

Specialized FAQ

How does the USB2642 handle flash media card compatibility?

The device supports Secure Digital (SD), SD High Capacity (SDHC), SD Extended Capacity (SDXC), MultiMediaCard (MMC), and Embedded MultiMediaCard (eMMC) formats, with storage addressability up to 2TB.

What is the function of the I2C over USB bridge?

The I2C bridge allows the USB host to control any I2C slave device operating at a 50 kHz serial clock through host-initiated SCSI pass-through commands using Mass Storage Class drivers.

Can the USB2642 be configured without external memory?

Yes, the device loads default settings from internal firmware after a reset. However, it also supports configuration via external SPI ROM for code execution or external I2C EEPROM for custom vendor and product IDs.