USB2228-NU-11

Specialized Overview

The USB2228-NU-11 is a fourth-generation USB 2.0 flash media controller designed for interfacing various memory cards to the USB bus. It integrates a Fast 8051 microprocessor, USB 2.0 PHY, and controllers for CompactFlash, SmartMedia, Memory Stick, Secure Digital, and MultiMediaCard formats. The device features on-chip power FETs, double-buffered bulk endpoints with 512-byte buffers, and supports internal or external program memory. It operates at 3.3V I/O with 5V tolerance and utilizes a 128-pin VTQFP package.

Specialized Feature Summary

• Integrated hardware support for multiple flash media standards including CF, SM, MS, SD, and MMC.
• Built-in 8051 microprocessor providing low-speed control functions and firmware execution capabilities.
• On-chip power FETs enable direct supply of card power, reducing external component requirements.
• Supports simultaneous operation of specific device groups with individual card power control.

Specialized Applications

• USB flash drives supporting multiple card types
• Multi-card readers for digital cameras and mobile devices
• Embedded storage solutions requiring bootable BIOS compatibility

Specialized Procurement Notes

Verify the specific suffix '-NU-11' against the manufacturer's current product identification system to confirm pinout, temperature range, and packaging details. Ensure the ordering code matches the required RoHS compliance status and package variant listed in the latest datasheet revision DS00002256A.

Specialized Selection Notes

Select this controller for applications requiring broad compatibility with legacy and standard flash media formats. Consider the integrated 8051 core for custom firmware implementation and the on-chip regulators for simplified power design. Verify that the 128-pin VTQFP package fits the target PCB footprint constraints.

Specialized Part Context

The USB2228 belongs to Microchip's fourth-generation USB 2.0 flash media controller family, alongside the USB2227. These devices are engineered as complete system solutions for mass storage interfaces, combining protocol handling, media-specific controllers, and power management in a single silicon die.

Specialized Replacement Considerations

Check for updated revisions within the USB2227/USB2228 series. No direct cross-model substitutes are documented; verify compatibility with existing firmware if replacing with other USB222x variants.