However, on my scope with a measured risetime of 660 ps, this version did 1.27 ns. Taking the scope RT in account that's a risetime of about 1.09ns! Not too bad. Yeah, but I'd not use a $5 oscillator to tweak my scope's front end.
This version looks more "ringy" than the first one, though.
Nevertheless, it's still very good performance for DIP14 package.
Maybe it's the Chinese chip being better than original AC logic.
One pattern I have seen in knockoff ICs is that they are often die shrinks on more advanced processes; apparently it saves them money somehow.
Yeah, the logo on the 74AC14 looks a little sloppy. I bought a large batch of IC's from Digi Key back in 2010. These, I think, were part of the batch. I don't recall getting any others, but then 13 years is a long time.
If you still have the Digikey bag they came in, the manufacturer name should be there.
My question about manufacturer was absolutely rhetorical. There is no Western manufacturer with this logo and it isn't TI logo either.
It's a vaguely TI-like blob intended to be different enough from TI that it's hard to prove trademark infringement.
Common practice in China. There is a new thread with some fake jellybean IC every other months here.
This chip probably (hopefully) didn't come from DigiKey, and 13 years is a lot of time indeed