CPLD - Complex Programming Logic Devices
Integrated circuits containing many programmable AND/OR arrays and macrocells
A complex programmable logic device, also known as a CPLD, is an IC with programmable macrocells and AND/OR arrays. Macrocells contain complex logic operations for implementing disjunctive normal form expressions. CPLDs are just an example of the embedded processors and controllers and other integrated circuits you can find using Octopart.
What Is a CPLD?
A complex programmable logic device is a type of programmable logic IC that lies between simple PLDs and FPGAs in terms of complexity and capability. The architecture centers on macrocells, each containing a programmable AND-OR array and an optional register, all connected through a centralized interconnect matrix. That matrix is key: it gives CPLDs predictable, deterministic signal timing that designers can rely on across power cycles. Configuration is stored in nonvolatile memory, typically Flash or EEPROM, so the device powers on instantly with no external configuration ROM required.
CPLD Architecture and How It Affects Your Design
CPLD architecture organizes logic into function blocks, each containing a group of macrocells tied together through the programmable switch matrix. Because every macrocell connects to the interconnect matrix with roughly equal path lengths, propagation delays remain consistent and predictable, which is important for timing-critical control applications. That deterministic behavior makes CPLD ICs a strong fit for state machines, address decoding, bus interfacing, and power-up sequencing. CPLD programming is done using hardware description languages. Major CPLD families from Lattice Semiconductor, AMD, and Intel / Altera each have dedicated toolchains.
CPLD vs FPGA: Choosing the Right Device
CPLDs and FPGAs implement programmable digital logic, but they serve different design needs. A CPLD uses nonvolatile memory, so it powers up instantly with no boot sequence. Most FPGAs use volatile SRAM for configuration, requiring an external memory device to reload logic on every power cycle. FPGAs scale to far higher logic densities and include dedicated DSP blocks.
Identify the Right CPLD ICs for Your Project on Octopart
Octopart indexes millions of components from distributors and manufacturer-direct sources globally. Search by part number, parametric spec, or cross-reference to locate the exact CPLD chip your design requires. Start your search above to see distributor listings with datasheets, pricing, and availability across your sourcing options.
Frequently Asked Questions
Are CPLDs still used?
Yes. CPLDs remain an active component category in industrial control, automotive electronics, telecommunications, and embedded systems. Their nonvolatile configuration, low power draw, and predictable timing make them difficult to replace with FPGAs in applications where instant startup and simple logic consolidation are the priorities. They are also widely used to sequence FPGA boot processes.