Texas Instruments Schmitt Trigger inputs
It doesn't use schmitt trigger inputs on those pins. Look at the recommended input levels, they are fairly normal for some logic gates without schmitt trigger inputs.


VIH High-level input voltage 0.85 VCC minimum
VIL Low-level input voltage 0.15 VCC maximum


I also would suspect that if it did use schmitt trigger inputs it would mention this on page one of the data sheet. There would also be some mention of the input hysterisis voltage limits.