CY7C68320C-56LFXC

Controllers Overview

The CY7C68320C-56LFXC is a fixed-function EZ-USB AT2LP USB 2.0 to ATA/ATAPI bridge manufactured by Cypress Semiconductor Corp. It operates in a 56-pin QFN package and supports High Speed (480 Mbps) and Full Speed (12 Mbps) USB signaling. The device provides a 4 KB FIFO buffer and interfaces with ATA/ATAPI-6 compliant mass storage devices, supporting PIO Modes 0, 3, and 4, Multiword DMA Mode 2, and UDMA Modes 2, 3, and 4. It requires a 24 MHz crystal oscillator and functions at 3.3V. Configuration data is stored in an external serial EEPROM via the I2C interface.

Controllers Feature Summary

• Fixed-function implementation requiring no firmware for USB-to-ATA/ATAPI bridging
• Supports HID interface or custom GPIOs for features like single-button backup and LED notification
• Certified compliant with USB 2.0, Mass Storage Class, and Bulk-Only Transport specifications
• Enables bus-powered and self-powered designs with automatic drive presence detection

Controllers Applications

• Bus powered Compact Flash readers
• Portable USB hard drives
• Digital rights management compatible media players
• CD-ROM and DVD±R/W optical drives

Controllers Procurement Notes

Verify the specific suffix LFXC corresponds to the 56-pin QFN Pb-free package configuration. Confirm that the required 24 MHz crystal and external serial EEPROM are included in the bill of materials. Ensure the design accommodates the necessary pull-up resistors for the I2C interface and USB differential pairs as specified in the datasheet layout guidelines.

Controllers Selection Notes

Select this component when a firmware-free solution for USB mass storage is required. The CY7C68320C variant specifically offers GPIO capabilities for user interface integration, distinguishing it from the CY7C68300C series. Consider the 56-pin QFN package constraints regarding thermal dissipation and PCB trace routing for high-speed signals during the initial hardware design phase.

Controllers Part Context

This part belongs to the EZ-USB AT2LP family, which serves as a cost-effective alternative to previous Cypress solutions like the ISD-300A1 and EZ-USB AT2. While the CY7C68300C series maintains pin compatibility with legacy designs through backward compatibility mode, the CY7C68320C introduces enhanced GPIO functionality and different package options including TQFP.

Controllers Replacement Considerations

Public confirmed substitute part numbers: CY7C68321C-56LFXC.