CY7C68321-100AXC

Controllers Overview

The CY7C68321-100AXC is a fixed-function USB 2.0 to ATA/ATAPI bridge IC from Cypress Semiconductor, operating at high speed (480 Mbps) or full speed (12 Mbps). It supports up to two ATA/ATAPI devices and includes a 4-Kbyte FIFO buffer. The device operates on a single 3.3V supply and utilizes a 24-MHz crystal for timing. Configuration data and USB descriptors are stored in an external serial EEPROM via an I2C interface. The component features GPIO pins and HID support for custom control functions.

Controllers Feature Summary

• Fixed-function mass storage bridge requiring no firmware code
• Supports both self-powered and USB bus-powered operation modes
• Compatible with USB Mass Storage Class Bulk-Only Transport specification
• Includes General Purpose Input/Output (GPIO) and Human Interface Device (HID) capabilities

Controllers Applications

• Bus-powered CompactFlash readers
• Portable USB hard drives
• Digital cameras and imaging peripherals
• MP3 players and personal media players

Controllers Procurement Notes

Verify the exact ordering suffix against official manufacturer documentation to ensure correct package type and temperature rating. Confirm current availability status as legacy components may have limited stock or end-of-life designations. Cross-reference datasheet revisions to validate pinout compatibility and feature sets before procurement.

Controllers Selection Notes

Select this model for designs requiring a dedicated USB-to-ATA bridge without microcontroller programming overhead. Ensure the application supports 3.3V logic levels and provides space for an external serial EEPROM. Verify that the target system accommodates the 100-pin TQFP package dimensions and thermal requirements specified in the mechanical drawings.

Controllers Part Context

This component belongs to the EZ-USB AT2LP family of USB mass storage bridges. It serves as a successor to earlier fixed-function ATA bridge solutions, offering improved power efficiency and integrated GPIO functionality compared to predecessors like the CY7C68300A series.

Controllers Replacement Considerations

The CY7C68320 is the self-powered variant within the same family. For backward compatibility with older designs, the CY7C68300B/CY7C68301B series offers pin-compatible options in different packages.