nonverter to BCD

[ericgibbs]

I hope the OP doesn't actually have to build the thing.

hi Bill,
In his opening post he says 'make', using logic, I have taken him literally.

Even if he has only to draw the logic diagram it no easy task.

 

[justas12]

yes i need to design on a paper, show how i made it, and to show how it works using EWB or multisim.

 

[justas12]

how to make c module from truth table? using C-map?

 

[justas12]

so i made c block. it works! how, can i make EI (enamble input) for my circuit?

**broken link removed**

 

[ericgibbs]

so i made c block. it works! how, can i make EI (enamble input) for my circuit?

hi,
Well done.

Why do you require an EI enable input, what would it do.?

 

[justas12]

when EI is logic 1 i think it allow to set binary code, when 0, you can't set code. something similiar like D trigger with C gate. am i right?

 

[ericgibbs]

when EI is logic 1 i think it allow to set binary code, when 0, you can't set code. something similiar like D trigger with C gate. am i right?

If you set the binary code to '0000', then that is a valid code for "0".

If you wanted to 'disable' the convertor, look at the use of tristate gates on the 'outputs'.

For example if you connected the outputs from the convertor thru a HEF40097 non inverting buffer, you could use the /EO pin to enable/disable the output.

OK.?

 

[justas12]

For example if you connected the outputs from the convertor thru a HEF40097 non inverting buffer, you could use the /EO pin to enable/disable the output.

output? but i need to enable/disable inputs

 

[ericgibbs]

output? but i need to enable/disable inputs

Then put the 40097 on the inputs, add pull down resistors on the input to the C blocks, use the 40097 EO pin.

OK.?