Linking 4017s

[bitem2k]

Hi all, anyone have any idea how to link 2 4017s to flash 18 leds?

If i connect to the %10 then linking them would produce numbers like 1- 99.
Where as i need numbers 1 - 20.

thanks very much

 

[Roff]

Hi all, anyone have any idea how to link 2 4017s to flash 18 leds?

If i connect to the %10 then linking them would produce numbers like 1- 99.
Where as i need numbers 1 - 20.

thanks very much

The TI datsheet shows how to cascade them.

 

[audioguru]

Texas Instruments' datasheet shows 17 cascaded LEDs.
Bill Bowden shows how to cascade 18 LEDs, uses Mickey Mouse diode gates and he explains how it works:

 

[Roff]

Texas Instruments' datasheet shows 17 cascaded LEDs.
Bill Bowden shows how to cascade 18 LEDs, uses Mickey Mouse diode gates and he explains how it works:

Here's a way to cascade 4017s for 18 counts that uses more respectable logic. I didn't show the LEDs.
If anybody needs the CD4017 model (I made it for SWcad, don't know if you could make it work for other simulators), let me know.

 

[bitem2k]

Ok ,thnx v much