CD74HC14: CD74hc14 part differences

Part Number: CD74HC14


 

 

Hi Roy,

 

Thanks for the extra context, I didn’t know there was a post about this on the E2E support forum already. What type of application is this oscillator being used for?

 

I’ll look into the differences between the part markings since that’s a bit more out of the scope of our product apps team who is supporting this on E2E. This may help explain the oscillations seen at power up.

 

However, for the questions regarding the Schmitt Trigger input device vs the non-Schmitt Trigger version for the oscillator circuit, I’d follow up directly on the E2E thread since our apps team would be best equipped to elaborate on their response. It may just be for this specific type of circuit that they are recommending the non-Schmitt Trigger devices.

 

Best,

 

Camilo Alvarez | Field applications | Texas Instruments

Email: c-alvarez@ti.com | Phone: 512.838.1411 | Linkedin

 

TI

this email sent to me from TI 

waiting to hear until after holidays about differences in part markings

never heard back

before looking at using non non-Schmitt Trigger for oscillator

  • Hi Roy,

    These devices have gone through a PCN change where it has a new process and die. The older device may have been robust enough to withstand the usecase, but using it in an oscillator circuit was already outside of the datasheet specs. The new devices are not able to be used in this way. 

    In the previous thread, Nikki mentioned using an unbuffered device as these are the recommendation for oscillator usecases.