Whether you are working on a retro computing device, or experimenting with digital logic, you’ll find that in most instances CPLDs can perform the same operations as a cluster of 7400 series discrete logic chips. Discrete logic devices, long considered the workhorses of the semiconductor industry, held a unit cost advantage over programmable logic devices for several decades. However, times have changed significantly. Advances in semiconductor process technology for CPLDs have driven the costs of these devices down to a point where they now offer a highly compelling discrete logic replacement alternative.
Xilinx engineers have prepared several white papers outlining the benefits and processes involved in replacing discrete logic 7400 series logic chips with CPLDs, such as those found in our CPLD Development Boards.
TTL “Burn Rate” for Xilinx CPLDs familiarizes logic designers that have previously not used programmable logic with the benefits of Xilinx CPLDs, and shows how to go about translating existing TTL logic into similar CPLD solutions.
Another relevant document is The Advantages of Migrating from Discrete 7400 Logic Devices to CPLDs comparing the costs of a discrete logic component-based circuit with those of a Xilinx CPLD.