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Infineon Technologies CY7C68321C-56LFXC
- Part No.:
- CY7C68321C-56LFXC
- Manufacturer:
- Infineon Technologies
- Category:
- Controllers
- Package:
- 56-VFQFN Exposed Pad
- Datasheet:
-
CY7C68321C-56LFXC.pdf
- Description:
- IC USB 2.0 BRIDGE AT2LP 56VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,601
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Product details
Overview
CY7C68321C-56LFXC from Cypress Semiconductor is a fixed-function USB 2.0 to ATA/ATAPI-6 bridge IC enabling mass storage connectivity without firmware development. It supports high-speed (480 Mbps) and full-speed (12 Mbps) USB operation, 48-bit addressing for drives >137 GB, UDMA Mode 4 (66 MB/s), and dual-device configurations including CompactFlash + ATA slave. It is optimized for battery-powered portable storage devices such as USB CF readers and mobile hard drives.
For engineers reviewing the CY7C68321C-56LFXC datasheet, CY7C68321C-56LFXC pinout, CY7C68321C-56LFXC application, or CY7C68321C-56LFXC equivalent, key selection criteria include its HID/GPIO capability for user controls, 56-pin QFN Pb-free package, low-power 3.3V operation, and native compatibility with Windows and macOS mass storage class drivers.
Technical Context
The CY7C68321C integrates a Smart USB FS/HS engine, 4 KB FIFO buffer, PLL-based 24 MHz clock generation, and full ATA interface logic supporting PIO Modes 0/3/4, Multiword DMA Mode 2, and UDMA Modes 2–4. Its I²C bus master configures device behavior via external EEPROM, enabling boot-time pinout selection between AT2LP and legacy AT2 modes.
It implements the USB Mass Storage Class Bulk-Only Transport (BOT) specification (TID# 40490119), complies with ATA/ATAPI-6, and supports ATA security features, ATAPI serial number VPD page retrieval for DRM, and BIOS boot support via Mode Page 5 - all without host-side driver customization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| USB Speed | High-Speed (480 Mbps) and Full-Speed (12 Mbps); enables backward-compatible connection to legacy hosts while maximizing throughput for modern systems. |
| ATA Interface | Compliant with ATA/ATAPI-6; supports master/slave or CF-only configurations, enabling flexible integration with HDDs, CD/DVD drives, and CompactFlash cards. |
| Data Transfer Rate | UDMA Mode 4 (66 MB/s); matches performance of mid-2000s IDE interfaces, sufficient for CF Type II and 2.5″ PATA HDDs in portable designs. |
| Addressing Support | 48-bit LBA addressing; allows access to storage devices larger than 137 GB, essential for modern capacity requirements in embedded storage bridges. |
| Power Supply | Single 3.3V supply; eliminates need for level-shifting or dual-rail design, reducing BOM count and PCB area in space-constrained portable applications. |
| GPIO/HID Interface | Dedicated GPIO0–GPIO2 pins + HID-class interface; enables hardware-triggered functions like single-button backup, LED notification, or power-off control without MCU intervention. |
| Package | 56-pin QFN (7 mm × 7 mm, 0.5 mm pitch); RoHS-compliant, thermally efficient, and suitable for compact USB storage enclosures and handheld devices. |
Pinout & Package
Package: 56-pin QFN (7 mm × 7 mm, 0.5 mm pitch), Pb-free, exposed thermal pad (pin 29 = GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RESET# | Active-low reset input | Asynchronous hardware reset; asserted by host or external supervisor to reinitialize USB and ATA state machines without power cycle. |
| VBUS_ATA_ENABLE | ATA interface enable control | Enables/disables ATA bus drivers; used to place ATA interface in Hi-Z for sharing with other controllers (e.g., IEEE-1394 bridge or MP3 decoder). |
| GPIO0–GPIO2 | General-purpose I/O / HID report inputs | Configurable as digital inputs or HID report sources; supports button press detection, status indication, or custom peripheral signaling without firmware. |
| DD0–DD15 | 16-bit ATA data bus | Bidirectional parallel data path; supports all ATA transfer modes including UDMA, with internal 4 KB FIFO buffering to absorb seek latency. |
| DA0–DA2, CS0#, CS1#, DIOR#, DIOW#, DMACK#, INTRQ | ATA control and address signals | Full set of ATA command/control lines; enables direct interfacing to standard ATA/ATAPI devices without glue logic or address decoding. |
| SCL / SDA | I²C bus interface | Connects to external serial EEPROM (e.g., 24AA02E48); stores USB descriptors, VID/PID, and configuration data including AT2LP/AT2 pinout selection signature (0x534B). |
Key Features
| Feature | Design Value |
|---|---|
| No-firmware operation | Fixed-function architecture eliminates need for custom firmware development or USB stack integration, reducing time-to-market for mass storage peripherals. |
| USB Mass Storage Class compliance | Fully compatible with native OS drivers (Windows 98SE–XP, macOS X); no vendor-specific driver installation required for plug-and-play functionality. |
| Flexible power modes | Supports both bus-powered (500 mA @ 5 V) and self-powered operation; CY7C68321C variant optimized for battery-powered designs with low quiescent current. |
| ATA bus sharing capability | Hi-Z ATA interface control (via VBUS_ATA_ENABLE) allows coexistence with secondary controllers on same ATA bus, enabling multi-interface storage subsystems. |
| Manufacturing test support | USB-based board-level test mode enables functional validation of ATA interface and EEPROM programming during production without dedicated test fixtures. |
Applications
| CompactFlash Reader | Portable USB Hard Drive |
|---|---|
|
Use Scenario: Handheld digital camera or industrial data logger using CF card as primary storage medium. IC Role / Device Role / Timing Role: USB-to-IDE bridge converting USB commands into ATA protocol; handles CF timing, command translation, and 48-bit LBA mapping. Use Value: Enables direct USB enumeration as mass storage class device; supports CF Type II mechanical form factor and UDMA Mode 4 burst transfers up to 66 MB/s. |
Use Scenario: Battery-powered 2.5″ SATA-to-USB adapter replacement using legacy PATA HDDs. IC Role / Device Role / Timing Role: Fixed-function bridge managing USB BOT protocol, ATA command sequencing, and 4 KB FIFO buffering to mask HDD seek latency. Use Value: Eliminates need for microcontroller and firmware; supports 48-bit addressing for >137 GB drives and ATA security features for encrypted storage. |
| DVD±R/W External Enclosure | Embedded Media Player Controller |
|
Use Scenario: Desktop or automotive rear-seat entertainment system with external DVD burner connected via USB. IC Role / Device Role / Timing Role: ATAPI bridge translating USB mass storage commands into ATAPI packet commands for optical drive control and media access. Use Value: Supports ATAPI serial number VPD page retrieval for DRM compliance and Mode Page 5 for BIOS boot capability in kiosk or embedded playback systems. |
Use Scenario: Portable MP3 player or personal video recorder using IDE-based microdrive or CF card for local content storage. IC Role / Device Role / Timing Role: Low-power bridge IC handling USB host-initiated file transfers while maintaining ATA bus integrity during sleep/wake cycles. Use Value: GPIO0–GPIO2 enable hardware-triggered recording start/stop and battery-status LED control; 3.3V-only operation reduces power conversion overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB-to-ATA bridge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C68320C-100AXC | 100-pin TQFP package; adds DRVPWRVLD, LOWPWR#, SYSIRQ, and additional GPIOs (GPIO3–GPIO5); no PWR500# pin. | Targeted at self-powered or mixed-power designs requiring more I/O flexibility and thermal margin; not suitable for ultra-compact battery-powered enclosures. | Select when board layout accommodates larger footprint and additional control signals are needed for advanced power management or interrupt routing. |
| CY7C68301C-56LFXC | Same 56-pin QFN package but lacks GPIO/HID interface; supports only basic ATA bridging; pinout identical to CY7C68300A in backward-compatibility mode. | Designed for cost-sensitive, firmware-free CF readers where user interaction (buttons/LEDs) is unnecessary; lower gate count and power consumption. | Select when HID/GPIO features are unused and legacy AT2 pinout compatibility is required for drop-in replacement in existing designs. |
Compared with CY7C68320C-100AXC and CY7C68301C-56LFXC, the CY7C68321C-56LFXC uniquely balances compact size, battery-optimized power profile, and integrated HID/GPIO for user-facing controls - making it the optimal choice for portable, feature-rich USB storage peripherals.
Availability
CY7C68321C-56LFXC is available at Aetrix Electronics and suitable for portable USB storage enclosures, battery-powered CF readers, and embedded media player controllers requiring stable component supply and long-term lifecycle support.
Supply support for CY7C68321C-56LFXC 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 solutions for embedded systems and consumer electronics.
The EZ-USB AT2LP product line was designed specifically to replace legacy USB-to-IDE bridges with lower-cost, lower-power, firmware-free alternatives for portable mass storage applications - targeting CF, HDD, and optical drive interfaces.
FAQ
Does CY7C68321C-56LFXC require external firmware or driver development?
No. The CY7C68321C-56LFXC is a fixed-function bridge IC with embedded USB Mass Storage Class and ATA/ATAPI protocol engines. It operates without user-developed firmware and uses native OS drivers on Windows (98SE through XP) and macOS X. Configuration is handled via external I²C EEPROM containing USB descriptors and pinout selection signatures.
Can CY7C68321C-56LFXC interface with both CompactFlash and a PATA hard drive simultaneously?
Yes. The device supports one or two ATA/ATAPI devices in configurations including CompactFlash only, ATA/ATAPI master only, ATA/ATAPI slave only, or CompactFlash plus ATA/ATAPI slave. This is enabled by configurable CS0#/CS1# decoding and dedicated ATAPUEN signal for CF power-up control.
What is the role of the GPIO pins on CY7C68321C-56LFXC?
GPIO0–GPIO2 serve dual roles: as general-purpose digital I/O for hardware signaling (e.g., button presses or LED control) and as HID report inputs for standardized USB Human Interface Device class reporting. They eliminate the need for an external microcontroller to implement user-facing features like single-button backup or power-off sequences.
Is CY7C68321C-56LFXC compatible with USB 3.0 hosts?
Yes, via backward compatibility. The IC operates exclusively in USB 2.0 mode (high-speed or full-speed) but is fully interoperable with USB 3.0 ports in USB 2.0 fallback mode. It enumerates as a standard USB Mass Storage Class device and does not utilize USB 3.0 SuperSpeed lanes or protocols.
CY7C68321C-56LFXC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 56-VFQFN Exposed Pad
- Programmable:
- Not Verified
- Protocol:
- USB
- Function:
- Bridge, USB to ATA
- Interface:
- ATA
- Standards:
- USB 2.0
- Voltage - Supply:
- 3.15V ~ 3.45V
- Current - Supply:
- 50mA
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 56-QFN (8x8)
- Grade:
- -
- Qualification:
- -
CY7C68321C-56LFXC FAQ
1.How can I place an order for CY7C68321C-56LFXC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C68321C-56LFXC on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CY7C68321C-56LFXC reliable?
The price and inventory of CY7C68321C-56LFXC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C68321C-56LFXC is usually 5 days.
3.What payment methods are accepted for CY7C68321C-56LFXC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C68321C-56LFXC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C68321C-56LFXC?
CY7C68321C-56LFXC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C68321C-56LFXC order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CY7C68321C-56LFXC?
For technical support, including CY7C68321C-56LFXC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C68321C-56LFXC requirements.
6.How does Aetrix verify that CY7C68321C-56LFXC is sourced from the original manufacturer or authorized distributors?
All CY7C68321C-56LFXC products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CY7C68321C-56LFXC meets industry standards.
7.What is the process for return or replacement of CY7C68321C-56LFXC?
All CY7C68321C-56LFXC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C68321C-56LFXC, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CY7C68321C-56LFXC part is unused and in its original packaging.
Return procedure for CY7C68321C-56LFXC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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