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Refering to the datasheet here, I find it hard to predict the names of the pins because the names are different for these 2 pictures. Is C0 the same as CE, and should CLK_INH be left floating/unconnected, because I don't see the LTSPICE CLK_INH pin on the datasheet?

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1 Answer 1

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  • \$CO\$ stands for carry-out
  • \$C\$ stands for "clock" or \$CLK\$
  • \$\overline{CLK\text{_}INH}\$ stands for clock inhibit (when low) or, more simply CE (clock enable)

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Don't leave any input\$^1\$ pins unconnected. Always connect to either logic 1 or 0 unless the data sheets says otherwise.

\$^1\$ corrected by adding the word "input".

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  • \$\begingroup\$ Don't leave any INPUT pins unconnected. Unconnected output pins are OK. Connecting unused output pins to power or ground would be a Bad Thing. \$\endgroup\$ Aug 26 at 16:25
  • \$\begingroup\$ @PeterBennett yes, absolutely correct. I shall amend. \$\endgroup\$
    – Andy aka
    Aug 26 at 16:26
  • \$\begingroup\$ @Andyaka, hi sir, thank you for answering. Just one question, if I use 2 CD4017 and I give the same clock signal to both of them (connect to same node) , will the leds rain simultaneously to each other without going out of phase from each other? SO, these chips have phase-locking machanism. \$\endgroup\$ Aug 27 at 7:36
  • \$\begingroup\$ @PeterBennett, hi sir, thank you for answering. Just one question, if I use 2 CD4017 and I give the same clock signal to both of them (connect to same node) , will the leds rain simultaneously to each other without going out of phase from each other? SO, these chips have phase-locking machanism. \$\endgroup\$ Aug 27 at 7:37
  • \$\begingroup\$ @jessicasmith what LEDs do you refer to? If both 4017s are un-reset together than they should remain in sync. The CLK signal keeps them in sync. But, beware of the reset pin; it isn't synchronous and, on odd occasions, the two devices may not be restored synchronously. \$\endgroup\$
    – Andy aka
    Aug 27 at 9:27

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