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EP4CE55F23C8N: A 55K-LE Cyclone IV E FPGA
10/19/2026 8:25:13 PM
EP4CE55F23C8N: A 55K-LE Cyclone IV E FPGA
1. Positioning
The EP4CE55F23C8N is a mid-range field-programmable gate array from Intel (formerly Altera) within the Cyclone IV E family. The Cyclone IV E line targets low-cost, low-power, high-volume applications, and the EP4CE55 sits toward the upper end of the family's logic density range. It is intended for designs that need a meaningful amount of programmable logic, abundant I/O, and embedded processing capability, while remaining cost- and power-sensitive. The device is fabricated on a 60 nm low-power process, operates from a core supply of 1.15 V to 1.25 V, and is rated for the commercial temperature range of 0°C to 85°C.
The ordering code decodes directly: EP4CE55 identifies the Cyclone IV E family with roughly 55K logic elements; F23 indicates the 484-pin FBGA package (23 mm × 23 mm); and C8N specifies commercial temperature, speed grade 8, and lead-free construction. Speed grade 8 is one of the slower bins in the family, with a maximum operating frequency typically quoted at 200 MHz. This suits control logic, interface bridging, and moderate-rate data paths rather than timing-critical high-performance designs.
2. Core Resources
The device provides 55,856 logic elements and 3,491 logic array blocks, with a total embedded RAM of 2,396,160 bits (approximately 2.34 Mb) and 324 user I/O pins. This resource mix can accommodate moderately complex digital logic, finite data buffering, and several parallel processing channels, but it is not sized for large DSP arrays or wide high-bandwidth image pipelines.
The Cyclone IV E architecture is built around logic elements, M9K memory blocks, and embedded multipliers. While the EP4CE55F23C8N does not offer the multiplier density of higher-end families, its ratio of on-chip RAM to logic resources is appropriate for protocol conversion, interface bridging, state-machine control, and mid-scale data acquisition. Designs requiring heavier arithmetic typically need an external DSP or a device with more hardened multipliers.
3. Package and I/O
The 484-pin FBGA package delivers 324 user I/O in a 23 mm × 23 mm footprint. For designs that need to connect multiple parallel buses, external memory (SDRAM, SRAM, Flash), and assorted peripheral interfaces, this I/O count provides adequate routing headroom. FBGA packaging requires multilayer PCB capability and reflow soldering; it is not suited to hand-soldered prototypes but is appropriate for teams with some manufacturing experience.
4. Key Specifications
| Parameter | Specification |
|---|---|
| Family | Cyclone IV E |
| Logic Elements | 55,856 |
| LAB / CLB | 3,491 |
| Total RAM | 2,396,160 bits (approx. 2.34 Mb) |
| User I/O | 324 |
| Package | 484-pin FBGA (23 × 23 mm) |
| Core Supply | 1.15 V to 1.25 V (nominal 1.2 V) |
| Process Node | 60 nm low-power process |
| Speed Grade | 8 (max operating frequency approx. 200 MHz) |
| Operating Temperature | 0°C to 85°C (commercial) |
5. Questions and Answers
Q: What does speed grade "8" mean for the EP4CE55F23C8N?
A: In Altera/Intel nomenclature, a lower speed grade number indicates a faster device. Grade 8 is one of the slower bins in Cyclone IV E, with a maximum operating frequency typically specified at 200 MHz. It is appropriate for control logic, interface protocols, and moderate-rate data paths with relaxed timing constraints, not for high-performance computing at elevated clock rates.
Q: Can this FPGA host a Nios II soft processor?
A: Yes. The EP4CE55 has sufficient logic to accommodate a Nios II core and its peripherals while leaving room for custom logic. Tasks such as serial communication, timers, and memory control can be handled in software, while high-speed or hard-real-time functions remain in hardware. This hardware/software co-design approach is common in industrial control and data acquisition.
Q: What does 2.34 Mb of on-chip RAM mean in practice?
A: It supports medium-depth FIFOs, line buffers, lookup tables, and protocol data caching. In image processing, it can buffer several rows of pixel data; in protocol conversion, it can hold multiple packets. It is not sufficient for full-frame buffers or large coefficient tables, which typically require external SDRAM or SRAM.
Q: Where does the EP4CE55 sit relative to the EP4CE30 and EP4CE75?
A: The EP4CE55 is denser than the EP4CE30 and lighter than the EP4CE75. For designs needing between roughly 30K and 55K logic elements, it offers more headroom than the EP4CE30 at a lower cost than the EP4CE75. It is the middle-weight workhorse of the family.
6. Typical Applications
Common applications for the EP4CE55F23C8N are concentrated in industrial automation, communication interfaces, and embedded control. In industrial settings, it can serve as a PLC co-processing unit, a motion control card, a multi-axis pulse generator, or a data acquisition front end requiring multiple parallel sampling channels. In communication equipment, it is well suited to protocol conversion, interface bridging (for example, PCI to local bus, or Ethernet to a custom backplane), and moderate-rate baseband processing. With a Nios II soft core, it can also underpin customizable embedded systems that benefit from hardware/software reconfigurability. The combination of 324 user I/O and 2.34 Mb of on-chip RAM provides a reasonable balance for these roles.
7. Conclusion
The EP4CE55F23C8N is not a device built for peak performance. It is a balanced mid-range Cyclone IV E part that trades extreme density and speed for cost efficiency, adequate I/O, and low power. Its 55K logic elements, 324 I/O, and 2.34 Mb of embedded RAM, combined with the flexibility of a Nios II soft processor, make it a practical and mature choice for moderately complex industrial control, protocol conversion, and embedded data acquisition designs. For projects that do not require high-end transceivers but do need programmable logic and I/O expansion, it remains a sensible engineering selection.
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