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So here here we go. During my journey I stumbled upon a very useful tool that I used to document the circuit: You just need to provide the in- and output by filling the state table and the program generates a gate based representation.
I could not find any information about who or when this circuit was invented but the datasheet from Texas Instruments states that it was first published So it is very likely that TI was the original inventor.
In the meantime you can buy the decoder from several manufacturers.
IC datasheet & applicatoin notes – Datasheet Archive
Pins a-g on the right side provide the decoded number whereas each of the pins corresponds to the segments on the display usually also labeled a-g. Additionally there are three more pins which dxtasheet special features:.
It should be noted that the ouputs of a are configured as open-collector which are active low. This could be an issue if you want to drive a 7-segment display directly because it will lead to an inverse display. The solution is then maybe a variant of this decoder: The circuit is logically identical with the but provides active high outputs:.
As datashewt can see the inputs are identical to the and the differences are on the output signals. The design files which can be opened in logisim can be found on GitHub.
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74248 Datasheet PDF – Texas Instruments
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