latching solution to 4017 sequencer

[johneli]

hi,
how can i achieve a latching process with a 4017 decade counter,that is to say as the counter out puts one,it will keep it on.the preceeding out put follows thus till it gets to the last count.
thanks
mba
[email protected]

 

[Roff]

You need to rephrase your question. I don't understand it, and I doubt that anyone else does. Also, if you would capitalize the first word of a sentence and put a space after periods (as you were taught in English class), it would make your writing easier to read.

 

[UberGeek]

I believe he wants the preceding outputs to remain On as the counter is clocked and counting upwards.

I pondered this recently myself before deciding to use a simple AVR instead.

 

[Exo]

Use a set-reset on every output

It can be made simply by connecting 2 nor gates together. Give it a signal once at the SET input and the output will remain on until a RESET is given
4017 is a cmos, so using a cmos nor gate like the 4001 is preferred.

 

[Roff]

Good idea. You need cross-coupled NOR (instead of NAND) gates, since 4017 outputs pulse high.
You might also look at CD4014 or CD4021, which are 8 stage shift registers. Parallel load can clear it, then you simply shift in a logic "1" on the serial input to fill it up.