CY7C68321-56LFXC

Controllers Overview

The CY7C68321-56LFXC is a fixed-function USB 2.0 to ATA/ATAPI bridge IC from the EZ-USB AT2LP series, manufactured by Cypress Semiconductor Corp. It operates at high speed (480 Mbps) or full speed (12 Mbps) and complies with the USB Mass Storage Class Bulk-Only Transport Specification. The device supports ATA/ATAPI-6 specifications, including 48-bit addressing and PIO modes 0, 3, 4, multiword DMA mode 2, and UDMA modes 2, 3, and 4. It features low-power 3.3V operation and includes Human Interface Device (HID) interface support for custom GPIOs. The component is housed in a lead-free 56-pin QFN package.

Controllers Feature Summary

• Fixed-function mass storage bridge requiring no firmware code
• Supports HID interface and custom GPIOs for button controls
• Compatible with native USB mass storage class drivers
• Enables bus-powered and self-powered designs

Controllers Applications

• Battery-powered portable hard drives
• Bus-powered CompactFlash readers
• Digital Rights Management (DRM) compatible media players
• Single-button backup devices

Controllers Procurement Notes

Verify the specific ordering suffix against official datasheets to confirm package type and temperature range. Confirm end-of-life status with authorized distributors as this model may be discontinued. Ensure compatibility with existing EEPROM configuration files if migrating from previous generations.

Controllers Selection Notes

Select this model for battery-powered applications due to its optimized power characteristics compared to the CY7C68320. Verify that the design requires HID functionality or GPIO expansion, as these are unique to the 320/321 series. Ensure the host system supports USB 2.0 High-Speed signaling for optimal data throughput.

Controllers Part Context

This component belongs to the EZ-USB AT2LP family, succeeding earlier models like the EZ-USB AT2. It provides a cost-effective path for designs previously using ISD-300A1 or ISD-300LP chips. The 321 variant specifically targets battery-operated portable storage solutions within the broader AT2LP portfolio.

Controllers Replacement Considerations

The CY7C68320 is a pin-compatible alternative suitable for self-powered designs. For legacy compatibility, the CY7C68301B offers backward compatibility with the original EZ-USB AT2 but lacks HID/GPIO features.