SN74LVC1GX04: Can't get oscillator to oscillate

Gabriel Solis

Part Number: SN74LVC1GX04

Hi Folks,

I want to use this device in my design, but have had a very difficult time getting it to oscillate.

The case no is: CS0194297, it shows the steps I've taken to try to get it to work, the Crystal Digikey Part Number is: SER4312CT-ND, it's a 120KHz crystal.

I've wrestled with cap and resistor values, changing out ic's, etc, with no success, if anyone else has used this device and gotten it to work consistently I could use your help.

Thanks,

-Steve S.

over 4 years ago

0 Chad Crosby over 4 years ago

TI__Expert 6680 points

Hi Gabriel,

Could you share your schematic here? As well as any waveforms you've captured of the device in operation?

Thanks!

Chad Crosby

0 Gabriel Solis over 4 years ago in reply to Chad Crosby

Prodigy 20 points

Hi Chad,

Yes I can.

Schematic:

These values have been adjusted several times.

Pcb:

Thanks for your help,

-Steve S.

0 Chad Crosby over 4 years ago in reply to Gabriel Solis

TI__Expert 6680 points

Hi Steve,

Are you seeing any oscillations on this circuit at all? Is the XOSC ringing? Is the SN74LVC1GX04 stuck High or Low? If you can provide any scope shots they would be really helpful.

Thanks!

Chad Crosby

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SN74LVC1GX04: Can't get oscillator to oscillate