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Internal Reference: EC-406

74LS47 Decoder

Decoders are mostly used in digital circuits to decode data into a form that is easier to be used by other components in a circuit. When looking at the schematic of a decoder, you will realize that it is not a very complicated circuit, but that it is quite a big circuit. By using this decoder instead of building the circuit needed to do the complete decoding of the circuit, you will reduce the size of your circuit quite a lot and also increase the speed at which the circuit will operate. 

Technical information:

Supply voltage


Input voltage


Max low level input voltage


Min high level input voltage


Pin layout:

Truth table:

Extra resources:

Data sheet for 74LS47