Updated October 15, 2026.
EP4CE6E22C8N is a Cyclone IV E FPGA for designs that implement their own digital logic. For a buyer maintaining an existing board, the useful starting point is the complete ordering code and the released design files. A similar family name does not establish that another device will fit the board or accept its programming file.
Ordering code and essential specifications
Altera's EP4CE6E22C8N product record confirms this exact ordering number and a 144-pin exposed-heatsink QFP package. The record currently lists it as in production; that is a manufacturer lifecycle status, not a statement of distributor inventory or delivery time.
- EP4CE6: Cyclone IV E, with 6,272 logic elements.
- E22: 144-pin EQFP. The handbook expands EQFP as Enhanced Thin Quad Flat Pack.
- C8: commercial temperature designation and speed grade 8.
- N: lead-free packaging designation.
- Memory and arithmetic: 270 Kbits of embedded memory, 15 embedded 18 × 18 multipliers and two general-purpose PLLs.
- E144 package I/O: 91 user I/O in the manufacturer's package matrix.
These resource and ordering details come from the Cyclone IV handbook, Volume 1, Chapter 1, Tables 1–1 and 1–3 and Figure 1–3. A resource count is a capacity limit; it does not promise that a particular processor, interface or filtering design will fit or meet timing.
Power and temperature limits
The Cyclone IV electrical datasheet, Table 1–3, specifies 1.15–1.25 V for the 1.2 V core supply and 0–85°C commercial junction operation. Junction temperature is the temperature inside the device, not the air around a cabinet. The PLL analog supply is nominally 2.5 V; PLL digital and bank supplies must also be included in the power plan.
Review regulator tolerance, PCB voltage drop, ripple and startup together. Checking only the nominal voltage printed on a schematic leaves out the conditions at the device pins. For a maintenance build, compare the actual regulator and capacitor substitutions against the original power budget before approving a changed BOM.
Pinout: use the package column, then the board netlist
Use the manufacturer's EP4CE6 pin-information document and select the E144 column. A development board's connector numbering is not the FPGA package numbering. Match each assigned signal to its bank, voltage, dedicated function and schematic net before importing constraints into a project.
The package's underside exposed pad must connect to PCB ground. The handbook identifies this as an electrical connection, not a thermal pad. Do not copy a generic QFP footprint and leave the underside connection unspecified.
- Reconcile the exact device selection, schematic symbol, footprint and pin assignments.
- Reserve configuration, JTAG and clock connections before counting available application signals.
- Check bank voltage and peripheral input thresholds for every interface.
- Review the power-off state of attached peripherals so they cannot unintentionally drive an unpowered FPGA.
- Run the fitter and review its pin and timing reports before releasing PCB artwork.
What the logic resources mean in practice
This family uses logic elements with four-input LUTs and registers, rather than the adaptive logic modules used in some other FPGA families. The distinction matters when comparing a resource estimate from a different device. A count of logic units from another architecture cannot simply be copied into an EP4CE6 utilization budget.
For a proposed interface bridge, start with a written interface contract: data width, maximum arrival rate, clock relationships, permitted backpressure and the action on overflow. Then compile a small version of the actual logic. Include synchronizers, FIFOs, resets and error reporting in the estimate; these supporting functions are part of the implementation, even when the block diagram shows only a bridge.
For buffering, calculate storage from the longest credible interruption in service. As an illustrative assumption, an input producing 100,000 eight-bit samples per second during a 10 ms service pause needs 1,000 bytes of payload storage before margin and metadata. This arithmetic is a planning example, not a measured result or a guarantee about a particular FPGA implementation. Memory layout and other users of RAM must still be checked in the compilation report.
Configuration and maintenance records
Treat the configuration image, source project and constraints as controlled parts of the assembly. A procurement record containing only the FPGA number is incomplete for a repaired or reproduced board. Keep the tool version, device selection, programming format and a known-good image identifier with the board revision.
When investigating a board that does not start, separate configuration failure from application failure. Record supply behavior, configuration status and JTAG accessibility first. Loading a temporary image can help isolate a design problem, but the approved production image and startup method must be restored and checked before release.
Equivalent parts and change approval
EP4CE6E22C7N and EP4CE6E22I7N are comparison candidates, not automatically approved replacements for EP4CE6E22C8N. A different speed or temperature code requires a review of the actual design and its operating envelope. Do not infer programming-file portability from a matching package name, and do not assume recompilation is always the only required change.
A substitution review should record the exact candidate, pin mapping, electrical limits, configuration requirements, timing results, thermal assumptions and board acceptance criteria. If the original project cannot be recovered, that missing evidence is itself a change-control issue. An approved substitute should appear explicitly on the buyer's BOM or deviation record.
Procurement checklist
Include the full EP4CE6E22C8N code, quantity, required delivery date, board revision and any agreed traceability or inspection requirements in an RFQ. Ask for current terms in writing. A blog specification table cannot establish availability, authenticity of a particular lot, warranty coverage or an authorized supply relationship.
Document dates
The handbook overview used here is revision 2.0, March 2016; the electrical datasheet is revision 2.1, December 2016. The pin-information landing page carries an August 9, 2018 date. These are documentation dates, not a claimed launch date for EP4CE6E22C8N.