USB2251I-NU-06

Specialized Overview

The Microchip USB2251I-NU-06 is a USB 2.0 compliant, Hi-Speed mass storage class peripheral controller designed for reading and writing to over 24 popular flash media formats. It supports CompactFlash (CF), SmartMedia (SM), Memory Stick (MS), Secure Digital (SD), and MultiMediaCard (MMC) families. The device features a fully integrated single-chip solution with an 8051 8-bit microprocessor running at 60 MHz, providing 64 KB ROM and 14 KB RAM. It operates within the industrial temperature range of -40°C to +85°C and utilizes a 128-pin VTQFP package.

Specialized Feature Summary

• Supports multiple simultaneous card insertions across various flash media types
• Hardware-controlled data flow architecture for self-mapped media
• Pipelined hardware support for access to non-self-mapped media
• Flexible assignment of Logical Unit Numbers (LUNs) and card type associations

Specialized Applications

• Flash Media Card Reader/Writer
• Printers
• Desktop and Mobile PCs
• Consumer A/V equipment
• Media Players/Viewers

Specialized Procurement Notes

Verify the specific ordering suffix NU-06 against the manufacturer's current documentation to confirm package type and RoHS compliance status. Ensure the industrial temperature grade (-40°C to +85°C) matches the application requirements. Confirm that the 128-pin VTQFP footprint aligns with the PCB design specifications before finalizing procurement.

Specialized Selection Notes

Select this component when designing systems requiring support for diverse legacy and modern flash media standards including CF, SM, MS, SD, and MMC. The industrial temperature rating makes it suitable for harsh environments. Consider the internal power FET capabilities and the need for external configuration via EEPROM if custom vendor or product strings are required for the host system.

Specialized Part Context

This part belongs to the USB2250/50i/51/51i family of ultra-fast USB 2.0 multi-slot flash media controllers. The 'i' suffix indicates the industrial temperature range variant, while the base model number distinguishes supported media types; specifically, the USB2251 excludes xD-Picture Card support compared to the USB2250.

Specialized Replacement Considerations

USB2250I-NU-06: Supports xD-Picture Cards in addition to the media types handled by the USB2251I. USB2251: Commercial temperature range (0°C to +70°C). USB2250: Commercial temperature range (0°C to +70°C) with xD support.