logic circuit 64 to 6 ?? - Electronic Circuits Projects Diagrams Free

korn · 21st October 2003, 06:26 PM

can someone please tell me the easyest way, and the cheapest one to make this:

I have around 64 switches on the input, and I need binary word for the output... alike this

If the switces are 00(a lot of zeros)0010000 that would mean 5 in binnary, so its 000101 on the output

Posible?

Squintz · 21st October 2003, 06:31 PM

can you try and explain that again.. I dont understand the Question

laroche73 · 21st October 2003, 08:08 PM

The biggest problem in finding an inexpensive solution is the large number of inputs. You could do it with priority encoders, like the 74148 or CD4532B. It would take nine 8:3 line encoders and three 8-input OR gates (CD4078B).

Take the CD4532 as an example. To handle 64 inputs, you'd wire eight of them in cascade mode, using the enable-in (EI) and enable-out (EO) lines. To get the three LSBs of the binary output, you need to OR all of the D0 lines (8 ) together, all the D1 lines together, etc. For the three MSBs, you need one more 8:3 priority encoder to encode the group-select (GS) lines from the other eight encoders. Total chip count, 12.

you can also find 10:4 line priority encoders, they wouldn't make things simpler for this application.

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21st October 2003, 06:26 PM	(permalink)
korn	logic circuit 64 to 6 ?? can someone please tell me the easyest way, and the cheapest one to make this: I have around 64 switches on the input, and I need binary word for the output... alike this If the switces are 00(a lot of zeros)0010000 that would mean 5 in binnary, so its 000101 on the output Posible?

21st October 2003, 06:31 PM	(permalink)
Squintz	can you try and explain that again.. I dont understand the Question

21st October 2003, 08:08 PM	(permalink)
laroche73	priority encoders The biggest problem in finding an inexpensive solution is the large number of inputs. You could do it with priority encoders, like the 74148 or CD4532B. It would take nine 8:3 line encoders and three 8-input OR gates (CD4078B). Take the CD4532 as an example. To handle 64 inputs, you'd wire eight of them in cascade mode, using the enable-in (EI) and enable-out (EO) lines. To get the three LSBs of the binary output, you need to OR all of the D0 lines (8 ) together, all the D1 lines together, etc. For the three MSBs, you need one more 8:3 priority encoder to encode the group-select (GS) lines from the other eight encoders. Total chip count, 12. you can also find 10:4 line priority encoders, they wouldn't make things simpler for this application.