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Infineon Technologies CY7C68320-56LFXC
- Part No.:
- CY7C68320-56LFXC
- Manufacturer:
- Infineon Technologies
- Category:
- Controllers
- Package:
- 56-VFQFN Exposed Pad
- Datasheet:
-
CY7C68320-56LFXC.pdf
- Description:
- IC USB 2.0 BRIDGE AT2LP 56VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,933
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Product details
Overview
CY7C68320-56LFXC from Cypress Semiconductor is a fixed-function USB 2.0 to ATA/ATAPI bridge IC enabling high-speed mass storage connectivity. It supports USB High-Speed (480 Mbps) and Full-Speed (12 Mbps), complies with ATA/ATAPI-6 and USB Mass Storage Class Bulk-Only Transport (BOT), and operates at 3.3 V with support for PIO modes 0/3/4, UDMA modes 2–4, and 48-bit addressing - deployed in portable CF readers and bus-powered external hard drives.
For engineers reviewing the CY7C68320-56LFXC datasheet, CY7C68320-56LFXC pinout, CY7C68320-56LFXC application, or CY7C68320-56LFXC equivalent, key selection criteria include its dual-power-mode operation (bus- or self-powered), HID/GPIO capability for button/LED control, QFN-56 lead-free packaging, and native compatibility with Windows and macOS mass storage drivers without custom firmware.
Technical Context
The CY7C68320 integrates a Smart USB FS/HS Engine with a 4-Kbyte FIFO buffer and dedicated ATA interface logic, enabling zero-firmware bridging between USB hosts and ATA/ATAPI devices. Its internal PLL locks to a 24-MHz crystal to generate precise USB timing and synchronizes ATA transfers via IORDY, DMARQ, DIOR#, DIOW#, and DMACK# handshaking signals.
It supports dual-device configurations (e.g., CompactFlash + ATA slave), places the ATA bus in high-impedance state for shared-bus arbitration, and uses an external I²C EEPROM for descriptor storage and boot configuration - including ATAPI serial number VPD page retrieval for DRM compliance and mode page 5 support for BIOS bootability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| USB Speed | 480 Mbps (High-Speed) or 12 Mbps (Full-Speed); enables plug-and-play compatibility with legacy and modern hosts without driver modification. |
| ATA Interface | 16-bit parallel ATA/ATAPI-6 compliant; supports master/slave or CF-only configurations with hardware-level IRQ and DMA handshake signaling. |
| Data Transfer Modes | PIO 0/3/4, multiword DMA 2, UDMA 2/3/4; delivers up to ~66 MB/s theoretical throughput for HDD/CF media under UDMA4. |
| Power Modes | Bus-powered (VBUS-driven) or self-powered; PWR500# and VBUS_ATA_ENABLE pins manage power-state coordination and ATA enable sequencing. |
| GPIO/HID Support | Dedicated GPIO0–GPIO2 pins with configurable HID report generation; enables single-button backup, LED notification, or power-off functions without MCU intervention. |
| Memory Interface | I²C-compatible SCL/SDA pins for external EEPROM; stores USB descriptors, device class configuration, and boot-time settings (e.g., ATAPUEN enable). |
| Crystal Frequency | 24 MHz fundamental-mode crystal input (XTALIN/XTALOUT); provides stable clock source for USB PHY and ATA timing control logic. |
Pinout & Package
CY7C68320-56LFXC is housed in a 56-pin, 8 mm × 8 mm, 0.5 mm pitch lead-free QFN package with exposed thermal pad. Pin functions are defined per Cypress Document 38-08033 Rev. *D, Figure 5-4 and Table 5-1, supporting both standard AT2LP operation and optional CY7C68300A backward-compatibility mode via EEPROM configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DD0–DD15 | ATA Data Bus (Bidirectional) | 16-bit parallel data path for ATA/ATAPI read/write cycles; Hi-Z on reset until VBUS_ATA_ENABLE asserts. |
| DIOR#, DIOW#, DMACK# | ATA Control Outputs | Active-low strobes synchronized to ATA timing; drive CMOS levels and support burst-mode transfers with IORDY handshaking. |
| INTRQ, IORDY, DMARQ | ATA Control Inputs | Asynchronous interrupt and ready signals from ATA device; used for PIO/DMA mode negotiation and transfer pacing. |
| DPLUS, DMINUS | USB Differential Pair | Terminated 90-Ω differential interface compliant with USB 2.0 electrical specifications; requires no external magnetics for full-speed operation. |
| SCL, SDA | I²C Serial Interface | Open-drain bidirectional bus for external EEPROM programming; operates at ≤400 kHz; powers up active for initial configuration load. |
| GPIO0–GPIO2 | Configurable Digital I/O | Programmable as inputs or outputs; mapped to HID report fields or discrete control signals (e.g., button press, LED drive) via EEPROM byte 8. |
| VBUS_ATA_ENABLE | ATA Interface Enable | Active-high signal that releases ATA bus from Hi-Z; must be asserted before ATA initialization; tied to VBUS in bus-powered designs. |
| PWR500# | VBUS Power Valid Indicator | Active-low open-drain output signaling stable VBUS ≥4.4 V; used to gate power to downstream ATA peripherals in bus-powered systems. |
Key Features
| Feature | Design Value |
|---|---|
| No-firmware bridge architecture | Eliminates need for embedded code development or USB stack licensing; reduces BOM cost and time-to-market for mass storage peripherals. |
| 4-Kbyte integrated FIFO buffer | Decouples USB and ATA timing domains; absorbs seek latency variations and improves sustained transfer rates across HDD/CF devices. |
| ATA bus high-impedance mode | Allows coexistence with IEEE-1394 or MP3 decoder controllers on shared IDE buses; controlled via ATA_EN (DD8) pin assertion. |
| HID-class GPIO interface | Enables human-interface functions (e.g., one-touch backup, status LEDs) using standard USB HID reports - no custom driver required. |
| ATA security and boot support | Implements ATA password lock/unlock commands and mode page 5 for BIOS boot sector access - critical for embedded industrial storage. |
Applications
| Portable CompactFlash Reader | USB-to-HDD Adapter |
|---|---|
|
Use Scenario: Handheld digital camera or industrial data logger reads/writes CF cards via USB cable to PC or embedded host. IC Role / Device Role / Timing Role: Fixed-function bridge translating USB BOT commands into ATA PIO/UDMA cycles; manages VBUS power sequencing and CF card reset timing. Use Value: Enables battery-operated, firmware-free CF access with <50 ms enumeration and full UDMA4 throughput - meeting USB-IF certification TID# 40460273. |
Use Scenario: External 2.5-inch SATA-less HDD enclosure connects to laptops via USB 2.0 for backup or media streaming. IC Role / Device Role / Timing Role: ATA controller handling command translation, 48-bit LBA addressing, and IORDY-synchronized burst transfers to mechanical HDDs. Use Value: Delivers consistent 35+ MB/s sustained write speed with zero host-side driver customization - compatible with Windows XP through 10 and macOS 10.4+. |
| DVD±RW Drive Enclosure | Industrial Media Recorder |
|
Use Scenario: Standalone USB DVD burner used in kiosks or broadcast editing stations for disc authoring without internal PC. IC Role / Device Role / Timing Role: ATAPI command interpreter supporting packetized SCSI commands over USB; handles ATAPI serial number VPD for DRM-licensed content playback. Use Value: Ensures compliance with optical drive certification requirements including mode page 5 boot support and ATAPI inquiry response formatting. |
Use Scenario: Ruggedized video recorder in transportation or surveillance systems writes MPEG-2/4 streams directly to IDE microdrives or CF cards. IC Role / Device Role / Timing Role: Reliable bridge with hardware-based ATA reset recovery and low-power suspend (LOWPWR#) for extended field operation. Use Value: Maintains data integrity during vehicle vibration or thermal cycling via robust PIO mode fallback and EEPROM-stored device-specific timing parameters. |
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 |
|---|---|---|---|
| CY7C68321-56LFXC | Identical pinout and feature set, but optimized for battery-powered operation with lower standby current (≤10 µA vs. 50 µA). | Preferred for portable devices where battery life exceeds 8 hours; shares same PCB layout but requires revised power rail decoupling. | Select CY7C68321 when system power budget mandates sub-100 µA sleep current and battery runtime is primary KPI. |
| CY7C68300B-56LFXC | Lacks GPIO/HID functionality; supports only basic ATA bridging and CY7C68300A pin-compatibility mode. | Suitable for cost-sensitive CF readers without user controls; no HID report generation or button-LED integration capability. | Choose CY7C68300B only if design reuses legacy AT2 hardware and omits all human-interface features. |
Compared with CY7C68321-56LFXC and CY7C68300B-56LFXC, CY7C68320-56LFXC uniquely balances bus/self-power flexibility with GPIO-driven usability - making it optimal for mid-tier consumer enclosures requiring both LED feedback and universal power sourcing.
Availability
CY7C68320-56LFXC is available at Aetrix Electronics and suitable for portable media enclosures, industrial data loggers, and USB-connected optical drives requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant lead-free packaging.
Supply support for CY7C68320-56LFXC 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 SoC solutions for embedded systems and industrial interfaces.
CY7C68320 belongs to the EZ-USB AT2LP product line, engineered specifically to replace legacy USB-to-IDE bridges like ISD-300A1 with reduced BOM count, lower power, and native OS driver support - targeting cost-sensitive, firmware-free mass storage peripherals.
FAQ
Does CY7C68320-56LFXC require external firmware or microcontroller code?
No. CY7C68320-56LFXC is a fixed-function bridge IC with hardwired USB-to-ATA logic. All protocol translation, descriptor handling, and timing control are implemented in silicon. Only a standard USB mass storage class driver is needed on the host - no firmware development, flash programming, or bootloader configuration is required.
What crystal frequency is mandatory for CY7C68320-56LFXC operation?
A 24.000 MHz fundamental-mode crystal is mandatory and connected between XTALIN and XTALOUT pins. This crystal provides the reference clock for the internal PLL, which generates precise USB 480-MHz and ATA timing signals. Using any other frequency or ceramic resonator will prevent proper USB enumeration and ATA synchronization.
Can CY7C68320-56LFXC support two ATA devices simultaneously?
Yes - it supports one master and one slave ATA/ATAPI device, or one CompactFlash device plus one ATA/ATAPI slave. The device automatically detects device presence and configures timing parameters accordingly. Dual-device operation requires correct jumpering or EEPROM configuration to assign CS0# and CS1# signals per ATA specification.
How is GPIO functionality enabled on CY7C68320-56LFXC?
GPIO0–GPIO2 are enabled via bit 7 of EEPROM configuration byte 8. When set, these pins function as configurable digital I/O mapped to HID report fields. Default state is input with internal pull-ups; output mode requires explicit EEPROM bit setting and HID report descriptor update. No external pull resistors are needed for basic button/LED use.
CY7C68320-56LFXC 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:
- -
CY7C68320-56LFXC FAQ
1.How can I place an order for CY7C68320-56LFXC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C68320-56LFXC 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 CY7C68320-56LFXC reliable?
The price and inventory of CY7C68320-56LFXC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C68320-56LFXC is usually 5 days.
3.What payment methods are accepted for CY7C68320-56LFXC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C68320-56LFXC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C68320-56LFXC?
CY7C68320-56LFXC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C68320-56LFXC 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 CY7C68320-56LFXC?
For technical support, including CY7C68320-56LFXC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C68320-56LFXC requirements.
6.How does Aetrix verify that CY7C68320-56LFXC is sourced from the original manufacturer or authorized distributors?
All CY7C68320-56LFXC 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 CY7C68320-56LFXC meets industry standards.
7.What is the process for return or replacement of CY7C68320-56LFXC?
All CY7C68320-56LFXC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C68320-56LFXC, 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 CY7C68320-56LFXC part is unused and in its original packaging.
Return procedure for CY7C68320-56LFXC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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