Discuss Logic Outputs Problem in 7493 IC in the UK Electrical Forum area at ElectriciansForums.net
Hahaha, thank you ! And I am very glad if you really mean it and if you really like it. I'll take it anyway, haha.Marvellous, Brilliant video of your work.
Yes I did. You remind me of this industrious inventor:Hahaha, thank you ! And I am very glad if you really mean it and if you really like it. I'll take it anyway, haha.
I dont understand what you mean by that... You mean that I figured out how to connect these 4inputs to get my 16 modes ?the decoder box on page 2 does not show any detail but you have worked out what is involved.
One can use two 4 bit to 16 line decoders to make a 5 bit to 32 line decoder by using the enable (EN) logic inputs on the decoders to select which decoder outputs to use depending on the state of the 5th bit. I cannot find an image for 5 bit to 32 line but the idea is expressed well enough by this attached image which shows the use of two 3 bit to 8 line decoders making a 4 bit to 16 line decoder. You can see how the 4th bit is connected a NOT gate and then one decoder connected to its output and the other decoder connected to its input - thus only one decoder is enabled at any time depending on the logic state of the 5th most significant bit. When the 5th bit is zero the decoded output is one of 0 to 7 and when the 5th bit is one the decoded output is one of 8 to 15. I leave to you to draw out how to use two 4 to 16 decoders to produce 32 outputs, and then how to use four 4 to 16 decoders to produce 64 outputs.I dont understand what you mean by that... You mean that I figured out how to connect these 4inputs to get my 16 modes ?
I actually searched and didnt find a BCD for 4 bits(binary) to output 16 modes (decimal). I didnt searched well enough I guess, because here you are with it. Very good that you show it to me !
Are they even bigger that this? with 32 outputs maybe? or 64? That will be cool to see ! Haha.
Yes, so my real question with 74138 was if (any) DECODER/DEMULTIPLEXER IC can be used as BCD. And viceversa, any BCD as a DECODER/DEMULTIPLEXER. For you these things are trivial but they are very new to me. I really dont see the similarities/diferences between these 2 types. Very interesting.... thanks. I will have to pay more attention to my 74138 and see what you've seen/explained.Since there are only 3 input bits (0 to 7) it can only select one of 8 output lines and thus does not do conversion of binary coded decimal (BCD) into 10 line one-hot. You need a 4 bit binary coded decimal word to do 0 to 9.
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