SN74LVC2GU04: Inverter for 3.3V 2ch crystal oscillator

Kazuki Itoh

Genius 10165 points

Part Number: SN74LVC2GU04
Other Parts Discussed in Thread: SN74LVC2G14, SN74LVC1GX04, SN74LVC2G34

Hi team,

Could you please help me to pick up right inverter for crystal oscillator?

The input voltage is 3.3V. The oscillation frequency is 20-40MHz.

The load capacitance is ~10pF each.

Two output channels are needed.

From the app note below, I found the combination of unbuffered and Schmitt-trigger inverter is recommended for crystal oscillator application.

https://www.ti.com/lit/an/scea099/scea099.pdf

So, is SN74LVC2GU04 + SN74LVC2G14 good choice?

Best regards,

Itoh

over 2 years ago

+1 Clemens Ladisch over 2 years ago

Guru 298860 points

These functions are combined in the SN74LVC1GX04.

When using two crystals, use two devices. If you need two outputs from the same clock, then a single LVC output should be strong enough, but if you really want two separate outputs, use a buffer like the SN74LVC2G34.

0 Kazuki Itoh over 2 years ago in reply to Clemens Ladisch

TI__Genius 10165 points

Hi Clemens-san,

Thank you so much for your suggestion!

By the way, I wonder why the app note doesn't list SN74LVC1GX04 as the recommended inverter.

I recommend you to update E2E Logic FAQ for oscillator, and SCEA099.

Regards,

Itoh

0 Emrys Maier over 2 years ago in reply to Kazuki Itoh

TI__Guru* 97017 points

Hello Itoh-san,

Kazuki Itoh said:
I recommend you to update E2E Logic FAQ for oscillator, and SCEA099.

Thank you for the recommendation.

Can you direct me to the FAQ that you are referencing? Or do you mean that we should create one to answer this type of question?

0 Kazuki Itoh over 2 years ago in reply to Emrys Maier

TI__Genius 10165 points

Hi Emrys-san,

Please find the link below for FAQ.

https://e2e.ti.com/support/logic-group/logic/f/logic-forum/913666/faq-h-use-cases-and-part-recommendations

Regards,

Itoh

0 Emrys Maier over 2 years ago in reply to Kazuki Itoh

TI__Guru* 97017 points

Thank you, Itoh-san.

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SN74LVC2GU04: Inverter for 3.3V 2ch crystal oscillator