TC/RCO on the 74HC161 doesn't seem to match the specsheets I find

[Peauteightaux]

Hello!

I'm trying to use the 75HC161 to make a 12-bit counter, so I need to chain them. Every specsheet I find says that the TC/RCO pin will be high when all of Qn are high and ENT is high; however, in game it looks like that pin is high 1 clock cycle too late (i.e. it will be high just after all of Qn are set low).

This seems to break the functionality of chaining them by connecting TC/RCO to ENT on the next chip for me, as it causes the middle chip to be one increment behind, and once the highest chip is incremented once, it'll increment every clock cycle (because the middle chip is 0000 and waiting on the lowest chip).

Since I'm pretty new to this I'd think the 75LS161 and 74HC161 might be different, but it looks like they are compatible in this regard.

[mike.bushell]

I shall take a look into it! If you can send me a save file and descriptions to [e-mail]

[wrOngplanet]

I had forgotten about this, but I also noticed that. https://steamcommunity.com/app/2198800/discussions/0/3815159202306976393/

I've chained them by connecting RCO to the next counter CLK, which initially I thought was the normal thing to do and it works in the sim (except as I later found out: not always) but apparently not in practice. Some other issues as well (not resetting properly for one).

EDIT: Thinking about it, it's not synchronous the way I did it, but I guess it would (or should) be if TC/RCO is connected to ENT (or CEP - Count Enable input).