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You will want 16 (4 x 16) decoders to match the 256 outputs. In other words, you will need 16 times 4 inputs, or 64, but you only have 8 inputs available.
A combinational circuit made of logic gates is a decoder. It is the encoder's opposite. A set of digital input signals is converted into an equivalent decimal code of the output by a decoder circuit. A decoder produces 2n outputs for every 'n' inputs. In this article, we'll talk about designing a circuit for a 4 to 16 decoder utilizing a 3 to 8 decoder.
A combinational circuit known as an encoder converts a group of signals into a code. An encoder circuit produces "n" outputs for "2n" inputs.
By combining two or more lesser combinational circuits, a decoder circuit of the higher combination is created. Two 3 to 8 decoder circuits or three 2 to 4 decoder circuits can be used to create a 4 to 16 decoder circuit.
The enable pin serves as both decoders' input when two 3 to 8 Decoder circuits are coupled. A 3 to 8 decoder circuit's enable pin is low when another 3 to 8 decoder circuit's enable pin is high.
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