EP3C25U256I7 - 24624-Lcell Cyclone III FPGA | Altera
MPN： EP3C25U256I7 ✗ 停產EP3C25U256I7 概覽
A field-programmable gate array, or FPGA, is a programmable digital logic device whose interconnect and logic configuration can be loaded after manufacture. Within the semiconductor hierarchy, an FPGA belongs to the programmable-logic family of FPGA and CPLD devices. The Cyclone III family targets designs requiring more logic capacity than small CPLDs while maintaining a broad selection of embedded memory, general-purpose I/O, and dedicated resources for communications, control, and signal processing.
The EP3C25U256I7 provides 24,624 logic elements, 156 user I/Os, and 608,256 configuration bits. Its listed maximum frequency is 437.5 MHz, although realized system performance depends on the selected logic architecture, memory interface, clocking scheme, I/O standard, timing constraints, and design utilization. The 1.2 V core voltage and 65 nm process place the device in a low-voltage, high-density programmable-logic class designed for efficient integration of digital control functions.
The 256-LFBGA package provides a high ball-count interconnect suitable for boards requiring substantial I/O access. Unlike a leaded package, the LFBGA requires careful escape routing, short return paths, controlled reference planes, and assembly-process controls for thermal and electrical performance. Industrial-temperature grading makes the device relevant to equipment that must operate beyond commercial-temperature environments, but the exact minimum and maximum junction or ambient ratings must be taken from the manufacturer documentation before a production release.
Typical applications include industrial automation, communications equipment, embedded control, test and measurement, and compact signal-processing modules. In these systems, the FPGA can implement parallel control logic, hardware state machines, interface bridges, protocol endpoints, and fixed-function datapaths that would otherwise require multiple programmable devices. Configuration storage, clock generation, power sequencing, and I/O voltage planning remain important parts of the surrounding circuit.
A key design consideration is that the advertised 437.5 MHz figure should not be treated as a guaranteed system clock for every design. Timing closure depends on the selected speed grade and logic path. Engineers should use the Quartus design tools and the Cyclone III device documentation to obtain pin assignments, timing results, power estimates, and configuration requirements before releasing PCB source files.
This product record combines the exact EP3C25U256I7 identifiers, package and architecture details, commercially focused buying guidance, replacement analysis, and practical implementation notes. It also distinguishes the verified drop-in option from family members that use different packages, helping engineers distinguish true PCB reuse from designs that require hardware changes.
直接替換替代品，適用於 EP3C25U256I7 — 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。
EP3C25U256I7N
✅ 直接替換📋 參考替代品（不在目錄中）
EP3C25U256I7 最大額定值與電氣特性
| FPGA Family | Cyclone III |
| Logic Elements | 24,624 cells |
| Maximum Operating Frequency | 437.5 MHz |
| User I/O Count | 156 I/Os |
| Configuration Memory | 608,256 bits |
| Core Supply Voltage | 1.2 V |
| Process Technology | 65 nm CMOS |
| 封裝 | 256-LFBGA |
| Total Terminals | 256 balls |
| 安裝類型 | Surface mount |
| Terminal Form | Ball |
| Package Shape | Square |
| Temperature Grade | Industrial |
| Product Type | Field-programmable gate array |
EP3C25U256I7 square 腳位配置指南
EP3C25U256I7（square 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： EP3C25U256I7.
請參閱 資料表 以查看完整腳位配置。
典型應用
EP3C25U256I7 適用於 6 應用s: Industrial Automation Controller, Communications Interface, Embedded Control and Data Acquisition, Test and Measurement Front End, Compact Signal-Processing Module, Programmable Security and Interface Hub.
Industrial Automation Controller
The EP3C25U256I7 fits industrial automation controllers that coordinate sensors, actuators, interlocks, and machine sequencing in one programmable device. Its 24,624 logic elements can host parallel control logic, state machines, diagnostic routines, and communication endpoints, while 156 user I/Os provide substantial board-level connectivity. The 1.2 V core supply supports efficient integration of modern logic functions, and the industrial temperature grade aligns with controlled industrial enclosures. Design the I/O voltage domains, isolation boundaries, grounding, and fail-safe behavior around the machine safety architecture; the FPGA should not be treated as the sole safety mechanism unless it has been independently validated for that function.
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Communications Interface
The EP3C25U256I7 is suitable for communications interfaces requiring parallel logic, multiple I/O channels, and field-programmable protocol handling. Engineers can implement framing, filtering, buffering, clock-domain crossing, and line-interface control around a 256-LFBGA footprint. Its 156 user I/Os are valuable when the device must connect parallel buses, memory-like interfaces, and control signals simultaneously. The listed 437.5 MHz device frequency should be treated as a starting point for architecture planning rather than a guaranteed line rate. Timing closure, input threshold selection, transceiver characteristics, impedance-controlled routing, and return-path continuity must be evaluated for the selected communication standard.
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Embedded Control and Data Acquisition
The EP3C25U256I7 can implement embedded control and acquisition functions where deterministic hardware logic must coexist with sensor conditioning and communications. Its programmable architecture allows designers to execute sampling control, digital filtering, calibration, event logging, and protocol conversion in parallel without relying on a separate microcontroller for every timing-critical task. The 65 nm Cyclone III implementation provides 24,624 logic elements and a 437.5 MHz listed operating-frequency ceiling, while 156 I/Os support external converters, memories, and status signals. Close timing on the critical datapath and verify memory-mapped interfaces, clock-domain-crossing architecture, and conversion-device timing before treating the system as deterministic.
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Test and Measurement Front End
The EP3C25U256I7 is appropriate for programmable test and measurement front ends that need parallel channel control, timing generation, pattern generation, and response analysis. The 24,624 logic elements can support multiple coordinated instrument channels, while the high I/O count reduces the need for external multiplexing logic. A 256-LFBGA package also enables dense routing between the FPGA, converters, memories, and trigger circuitry. Designers should use the Quartus timing analyzer to confirm every acquisition and trigger path, implement pipelining where necessary, and include calibration, deskew, and self-test functions. High-speed analog performance remains dependent on external converters and board signal integrity rather than the FPGA alone.
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Compact Signal-Processing Module
The EP3C25U256I7 supports compact signal-processing modules that benefit from parallel arithmetic, dedicated logic mapping, and numerous external connections. FIR filters, correlation engines, waveform generation, and pre-processing pipelines can be implemented as deterministic parallel hardware. With 156 user I/Os, the device can connect multiple converters, memory banks, and control interfaces without reducing the design to a small pin-count microcontroller. The 1.2 V core and 65 nm process support dense integration, but system designers must plan power, decoupling, clock jitter, and I/O voltage levels. Post-layout timing and power analysis should establish whether the 437.5 MHz listed device frequency meets the throughput required by the target sample rate.
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Programmable Security and Interface Hub
The EP3C25U256I7 can function as a programmable interface hub that coordinates authentication, protocol translation, secure command handling, and status monitoring. Programmable logic allows multiple interface formats and decision paths to be consolidated while retaining field-update capability. The 24,624 logic elements provide capacity for control and protocol logic, while 156 user I/Os allow integration with multiple external interfaces. The industrial grade can support controlled commercial or industrial environments, although the security boundary must include correct key handling, isolation, fault response, and update procedures. Review the device's unused pins, configuration access, boot behavior, and all external bus timing before using the FPGA as a security root of trust.
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推薦產品摘要
工程參考資料，適用於 EP3C25U256I7 — 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 | EP3C25U256I7N |
|---|---|---|
| Brand | Altera | Altera |
| Package | 256-LFBGA | 256-LFBGA - same package |
| FPGA Family | Cyclone III | Cyclone III |
| Logic Elements | 24,624 cells | 24,624 cells |
| Maximum Operating Frequency | 437.5 MHz | 437.5 MHz |
| User I/O Count | 156 I/Os | 156 I/Os |
| Core Supply Voltage | 1.2 V | 1.2 V |
| Process Technology | 65 nm CMOS | 65 nm CMOS |
| Temperature Grade | Industrial | Industrial |
| Ordering Suffix | I7 | I7N - additional ordering designation |
| Mounting Type | Surface mount | Surface mount |
主要差異化特點
- Retains the exact U256 LFBGA footprint in the closest replacement (對比EP3C25U256I7N)
- Matches the principal architecture ratings of the verified alternative (對比EP3C25U256I7N)
- Avoids the package mismatch present in the F256 family designation (對比EP3C25F256I7N)
設計說明
Treat the 256-LFBGA layout as a high-density escape-routing problem. Assign every ball in the Quartus-generated pin report, preserve continuous ground references beneath the device, and route high-speed signals over controlled reference planes. Review layer-transition return paths and via stubs before release. Because EP3C25U256I7 and EP3C25U256I7N share the same package designation, still compare their complete pin tables rather than assuming every ordering suffix preserves an identical board connection.
Separate the 1.2 V core rail from all externally driven I/O supplies, following the manufacturer recommendations for voltage domains, sequencing, and current capacity. Place the smallest suitable high-frequency bypass capacitors directly beside the relevant power and ground balls, then add bulk capacitance near the regulator according to the power-tree impedance analysis. Validate voltage ramps, tolerance, startup behavior, and I/O voltage compatibility before power is applied to the assembled board.
Use the Cyclone III handbook as the authority for configuration pins, power balls, clock inputs, and package-specific constraints. Preserve a clean clock distribution network, avoid routing sensitive signals through areas of heavy switching activity, and maintain matched-length geometry where a source-synchronous interface requires it. The 156 user I/Os provide substantial connectivity, but useful pin assignments still depend on the selected banks and I/O standards rather than on the raw I/O count alone.
Do not assume that a related Cyclone III MPN is PCB-compatible merely because its name contains 256. EP3C25F256I7N uses a different package designation, while EP3C25U256I7N retains the U256 package. A substitution also requires confirmation of the speed grade, temperature grade, configuration method, voltage limits, and timing. Treat the manufacturer pin table and Quartus reports as the final authority for any replacement decision.
合規資訊
The EP3C25U256I7 is identified as an industrial-temperature-grade FPGA, but explicit RoHS, REACH, lead-free, halogen-free, and conflict-minerals declarations are not present in the product information. The N suffix in EP3C25U256I7N must not be interpreted as proof of a specific compliance status without the manufacturer declaration.
