FPGA vs CPLD: Key Differences, Speed & Cost Guide
FPGAs are high-capacity Field-Programmable Gate Arrays; CPLDs are smaller Complex Programmable Logic Devices.
Engineers swap the terms because both reconfigure logic after manufacturing, yet one drives 5G base-stations while the other hides inside your car’s key fob.
Key Differences
FPGAs offer thousands of look-up tables, RAM blocks, and DSP slices, enabling video processing at 500 MHz. CPLDs fit a few hundred macrocells, run at 100 MHz, and boot instantly, making them ideal for glue logic and power sequencing.
Which One Should You Choose?
Pick FPGA when you need algorithms, memory, and speed; choose CPLD for simple state machines, instant-on reliability, and budgets under five dollars.
Examples and Daily Life
Your DSLR uses an FPGA to crunch 4K footage, while the CPLD inside the lens quietly manages motor drivers and autofocus triggers without adding cost or battery drain.
Can a CPLD replace an FPGA?
No; CPLDs lack the gates, RAM, and speed for heavy processing.
Do FPGAs always cost more?
Yes, they can reach hundreds of dollars, while CPLDs stay under $10.
Is power draw different?
FPGAs draw watts; CPLDs sip milliwatts.