Infineon Technologies CY7C68320-100AXC

Overview

CY7C68320-100AXC from Cypress Semiconductor is a fixed-function USB 2.0 to ATA/ATAPI-6 bridge IC supporting high-speed (480 Mbps) and full-speed (12 Mbps) operation, 48-bit addressing for large storage devices, and UDMA Mode 4 (66 MB/s) data transfer. It integrates a 4-Kbyte FIFO buffer, supports dual-device ATA/ATAPI configurations including CompactFlash, and operates at 3.3 V with self- or bus-powered capability in a 100-pin TQFP package.

For engineers reviewing the CY7C68320-100AXC datasheet, CY7C68320-100AXC pinout, CY7C68320-100AXC application, or CY7C68320-100AXC equivalent, key selection criteria include USB Mass Storage Class Bulk-Only Transport compliance, ATA PIO/DMA/UDMA mode support, GPIO-enabled HID interface for system control, and 100-pin TQFP layout compatibility with board-level test and shared ATA bus operation.

Technical Context

The CY7C68320-100AXC implements a dedicated hardware bridge between a USB 2.0 host interface and one or two ATA/ATAPI-6 compliant storage devices, eliminating firmware development requirements. Its Smart USB FS/HS Engine handles protocol translation, while the ATA Interface Logic manages command execution, IRQ signaling, and Hi-Z bus control for multi-controller sharing.

It features an integrated 24-MHz crystal oscillator interface, I²C-controlled EEPROM configuration (for USB descriptors and device settings), and configurable GPIOs (GPIO0–GPIO5) enabling HID-class functions like single-button backup or LED notification - a capability exclusive to the CY7C68320/CY7C68321 family.

Key Specifications

Pinout & Package

Package: 100-pin TQFP (14 mm × 14 mm, 0.5 mm pitch), lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB-to-ATA bridge applications.

Compared with CY7C68321-100AXC, the CY7C68320-100AXC offers identical feature set but higher active current tolerance - making it optimal for self-powered enclosures and dual-device hubs where GPIO control and thermal headroom are essential.

Availability

CY7C68320-100AXC is available at Aetrix Electronics and suitable for external USB storage enclosures, CompactFlash readers, industrial media recorders, and dual-device USB hubs requiring stable component supply and long-term lifecycle support.

Supply support for CY7C68320-100AXC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Cypress Semiconductor (now part of Infineon Technologies) is a fabless semiconductor company specializing in USB, memory, and programmable system-on-chip solutions for embedded and consumer electronics.

The EZ-USB AT2LP product line delivers turnkey USB mass storage bridges targeting cost-sensitive, firmware-free storage interface designs - particularly for legacy ATA/ATAPI device integration into modern USB ecosystems.

FAQ

Does CY7C68320-100AXC require external firmware or microcontroller code?

No. The CY7C68320-100AXC is a fixed-function bridge IC with hardwired USB Mass Storage Class Bulk-Only Transport logic. All protocol handling, ATA command translation, and descriptor management are implemented in silicon. External EEPROM stores only static configuration (VID/PID, strings), not executable code.

Can CY7C68320-100AXC support both ATA and ATAPI devices simultaneously?

Yes. It supports one ATA master and one ATAPI slave (or vice versa) on the same bus, or two devices of the same type. Configuration is controlled by EEPROM byte 1 bits [2:0], and the device automatically detects device type during power-up initialization per ATA/ATAPI-6 specification.

What is the role of the GPIO pins on the 100-pin TQFP package?

The six GPIO pins (GPIO0–GPIO5) are configurable via EEPROM byte 8 to operate as inputs or outputs. They enable HID-class functions such as pushbutton-triggered backup, LED status indication, or power-off sequencing - eliminating need for external logic or microcontroller in system-level control tasks.

Is CY7C68320-100AXC compatible with USB 3.0 hosts?

Yes, via backward compatibility. It operates exclusively at USB 2.0 speeds (480 Mbps max), but enumerates and functions correctly on USB 3.0/3.1/3.2 ports in High-Speed mode. No driver changes or host-side modifications are required - standard OS mass storage class drivers apply.