# How to match the pin of this IC in LTspice?

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?

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

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".

• 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. Aug 26 at 16:25
• @PeterBennett yes, absolutely correct. I shall amend. Aug 26 at 16:26
• @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. Aug 27 at 7:36
• @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. Aug 27 at 7:37
• @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. Aug 27 at 9:27