Programmable gate

This gate converts an AND gate or an OR gate by applying a logic 1 on the function input. The logic design utilizes eight two-input NAND gates. The number of gates may be reduced by replacing the five NAND gates enclosed by the dotted line with a two-input exclusive-OR, such as the TTL 7486.

The described circuit functions as a versatile logic gate that can be configured to operate as either an AND gate or an OR gate based on the logic level applied to its function input. The primary building blocks of this design are eight two-input NAND gates, which are known for their universal logic capabilities. By interconnecting these NAND gates appropriately, the circuit can achieve the desired logical operations.

In scenarios where efficiency is paramount, the design can be optimized by substituting five of the NAND gates, which are part of a specific configuration indicated by a dotted line in the schematic, with a two-input exclusive-OR gate. The TTL 7486 is a suitable component for this purpose, as it provides the necessary functionality while reducing the overall gate count. This substitution not only simplifies the circuit but also enhances its performance by minimizing propagation delays and power consumption.

The resulting circuit maintains the flexibility to toggle between AND and OR functions, making it a valuable component in digital systems where logic operations are frequently required. The use of NAND gates ensures that the design remains robust, as these gates can be easily sourced and integrated into various applications. Overall, this configuration exemplifies efficient logic design principles by balancing complexity with functionality.This gate converts an AND gate or an OR gate by applying a logic 1 on the function input/The logic design uses 8 two-input NAND gates The number of gates may be reduced by replacing the 5 NAND gates enclosed by the dotted line with a two-input exclusive-OR, such as the TTL 7486.