CY7C68321-100AXC USB 2.0 ATA Bridge | Cypress
MPN： CY7C68321-100AXC ✓ 啟用中CY7C68321-100AXC 概覽
The CY7C68321 belongs to the EZ-USB AT2LP family of USB storage interface controllers. An interface IC is a semiconductor category used to connect host buses and peripheral protocols; in this case, the bridge translates the USB 2.0 host interface into ATA/ATAPI signals used by compatible storage devices. Its position within the broader hierarchy is interface IC, then USB interface controller, then fixed-function USB-to-ATA bridge.
Verified listing information identifies the part as a 480 Mbps USB 2.0 interface solution with a 3.15 V minimum and 3.45 V maximum operating voltage. The ATA side can support CompactFlash and one ATA/ATAPI device. Its high-impedance ATA interface is useful when another controller, such as an IEEE 1394 device, must share the ATA bus. These details make the bridge relevant to legacy USB storage appliances, embedded ATA systems, and CompactFlash equipment.
The 100-pin TQFP package provides the board interface required for host, storage, power, control, and signal-conditioning connections. Because this legacy bridge targets USB 2.0 and ATA/ATAPI rather than modern USB storage standards, designers should verify host operating-system support, device compatibility, signal integrity, power sequencing, and connector requirements before releasing a new design. The verified distributor pages do not publish detailed timing, thermal, or environmental values, so those parameters remain to be confirmed from the manufacturer datasheet.
This page consolidates the verified product identity, package information, sourcing links, interface capability, and engineering selection criteria. It also distinguishes confirmed facts from parameters that require datasheet verification, helping engineers evaluate the CY7C68321-100AXC without treating catalog snippets as a complete electrical specification.
Designs should reserve adequate placement and routing flexibility for the 100-pin TQFP footprint, validate the ATA and USB signal-integrity requirements, and confirm device-support policy before production. For a new USB-to-ATA product, assess whether a modern USB mass-storage controller provides better long-term platform support. For maintaining an existing ATA/CompactFlash design, the bridge may remain suitable if its timing, power, and compatibility requirements are unchanged.
直接替換替代品，適用於 CY7C68321-100AXC — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
CY7C68321C-100AXC
✅ 直接替換📋 參考替代品（不在目錄中）
CY7C68321C-56LTXC
✅ 直接替換📋 參考替代品（不在目錄中）
CY7C68320C-56LTXC
✅ 直接替換📋 參考替代品（不在目錄中）
CY7C68321-100AXC 規格
| Product Type | Fixed-function USB 2.0 to ATA/ATAPI bridge IC |
| Product Family | EZ-USB AT2LP |
| USB Interface | USB 2.0 |
| Maximum USB Data Rate | 480 Mbps |
| ATA Support | ATA and ATAPI device support |
| Number of USB Ports | 1 port |
| Supported Device Configuration | CompactFlash and one ATA/ATAPI device |
| ATA Bus Sharing | High-impedance (Hi-Z) mode supported |
| Minimum Operating Voltage | 3.15 V |
| Maximum Operating Voltage | 3.45 V |
| 封裝 | 100-TQFP (14 x 20 mm) |
| 腳位數 | 100 pins |
| 安裝類型 | Surface mount |
| Product Category | UART interface IC / USB bridge |
| AEC-Q100 Qualification | not_applicable |
CY7C68321-100AXC 100-tqfp (14 x 20 mm) 腳位配置指南
CY7C68321-100AXC（100-tqfp (14 x 20 mm) 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： CY7C68321-100AXC.
請參閱 資料表 以查看完整腳位配置。
典型應用
CY7C68321-100AXC 適用於 6 應用s: Legacy USB 2.0 Storage Adapter, CompactFlash Embedded Storage, Shared ATA Bus Controller, Industrial Data Acquisition Terminal, Instrumentation USB-to-ATA Bridge, Retrofitted Peripheral Storage Interface.
Legacy USB 2.0 Storage Adapter
The CY7C68321-100AXC fits a legacy USB-to-ATA adapter because it provides a fixed-function USB 2.0 bridge operating up to 480 Mbps for one ATA or ATAPI device. Its 3.15 V to 3.45 V operating range and 100-TQFP package support a conventional 3.3 V embedded design. The verified datasheet excerpt also identifies CompactFlash support, which can simplify adaptation of an existing ATA storage architecture. Engineers should verify host-driver support, connector behavior, and the electrical limits of the selected drive before production.
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CompactFlash Embedded Storage
The CY7C68321-100AXC is suitable for embedded CompactFlash equipment where a host controller must access ATA-based storage through USB 2.0. The verified EZ-USB AT2LP description explicitly includes CompactFlash and one ATA/ATAPI device as supported configurations, while the bridge's 480 Mbps maximum data rate accommodates the USB 2.0 interface. Validation should cover cold-start behavior, media identification, sustained transfer performance, power requirements, and operating-system compatibility with the exact CompactFlash module selected.
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Shared ATA Bus Controller
The CY7C68321-100AXC can fit a mixed-interface design that shares an ATA bus between USB and another controller. The verified datasheet excerpt states that the ATA interface can be placed in high-impedance mode, allowing bus sharing with another controller such as an IEEE 1394 controller. This is useful in legacy multifunction systems, but correct arbitration and transition timing must be designed directly from the manufacturer datasheet. Board-level testing should verify no contention, no leakage problems, and correct recovery after bus release.
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Industrial Data Acquisition Terminal
The CY7C68321-100AXC can serve as a storage interface in an industrial data-acquisition terminal that records measurements to an ATA or CompactFlash device. USB 2.0 at up to 480 Mbps provides a defined host-side transport rate, while fixed-function operation simplifies integration compared with a software-programmed USB controller. Industrial suitability must be established from the missing temperature, qualification, and environmental data rather than assumed. Firmware should include recovery behavior for unexpected media removal, power interruption, and device-reset conditions.
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Instrumentation USB-to-ATA Bridge
The CY7C68321-100AXC is applicable to legacy instrumentation that stores captured waveforms or test records on ATA media through a USB 2.0 host connection. Its fixed-function USB-to-ATA architecture reduces the host-side protocol burden, and the verified source identifies USB 2.0 ATA interface operation with a 100-TQFP footprint. Designers should confirm whether the target instrument relies on ATA features beyond the supported device configuration and whether the bridge's USB enumeration behavior remains compatible with the installed operating system and test software.
推薦
Retrofitted Peripheral Storage Interface
The CY7C68321-100AXC can retrofit USB storage connectivity to an older peripheral that already exposes an ATA or ATAPI bus. The verified source confirms one USB port, support for CompactFlash and one ATA/ATAPI device, and an operating range of 3.15 V to 3.45 V. This use case is most appropriate when redesigning the host processor would be costly and the USB 2.0 platform remains supported. A complete compatibility review must include connector signaling, cable length, media power, device identification, and legacy driver support.
推薦
推薦產品摘要
工程參考資料，適用於 CY7C68321-100AXC — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | CY7C68321C-100AXC | CY7C68321C-56LTXC | CY7C68320C-56LTXC |
|---|---|---|---|---|
| Package | 100-TQFP (14 x 20 mm) | 100-TQFP (14 x 20 mm) | 100-TQFP (14 x 20 mm) | 100-TQFP (14 x 20 mm) |
| Brand | Cypress Semiconductor | Cypress Semiconductor | Cypress Semiconductor | Cypress Semiconductor |
| Product Type | USB Bridge, USB to ATA USB 2.0 ATA Interface | USB Bridge, USB to ATA USB 2.0 ATA Interface | EZ-USB AT2LP family candidate | EZ-USB AT2LP family candidate |
| Pin Count | 100 pins | 100 pins | 100 pins | 100 pins |
主要差異化特點
- Direct EZ-USB AT2LP ATA and CompactFlash support (對比CY7C68320C-56LTXC)
- Verified USB 2.0 operating data (對比CY7C68321C-56LTXC)
- Hi-Z ATA interface enables shared-bus designs (對比CY7C68321C-100AXC)
設計說明
Do not treat the catalog description as proof that a candidate is a true drop-in replacement. The verified alternatives share the 100-TQFP package designation, but package equality alone does not establish pin, register, timing, or firmware equivalence. Compare the complete manufacturer datasheets, revision notes, USB descriptors, ATA timing, and power rails before substituting CY7C68321C-100AXC, CY7C68321C-56LTXC, or CY7C68320C-56LTXC into an existing design.
Design the supply for the confirmed 3.15 V to 3.45 V operating range and verify the USB and ATA transceiver requirements separately from the manufacturer datasheet. The supplied snippets do not identify core and I/O voltage domains, quiescent current, load current, or power sequencing. Add local bulk and high-frequency bypass capacitance according to the reference schematic, and verify startup, suspend, reset, and hot-plug behavior with the attached ATA device.
Route USB and ATA signals on controlled-impedance layers with short paths and appropriate return-plane continuity. The bridge supports USB 2.0 at up to 480 Mbps and can place the ATA bus in a high-impedance state, so connector, cable, protection, and bus-release timing require careful validation. Use the manufacturer reference layout and pin names as the authority because individual pin assignments are not available in the supplied catalog snippets.
合規資訊
The supplied verified data does not state compliance status for CY7C68321-100AXC. A search result mentions RoHS and halogen-free information for CY7C68321C-100AXC, but those statements were not applied to the target without an authoritative source.
