On the CY29430 datasheet, the LF input specification is :
- VIL (Input low voltage DC coupled input) : 0.2 V max
- VIH (Input high voltage DC coupled input) : 0.8 min to 1.2 V max
And on the DC specification :
VIN Input voltage level All input, relative to GND : –0.5 min to 3.8 V max
Does it mean that the TCXO shouldn't deliver more than 1.2V or is it possible to connect à 3.3V TCXO ?
The TCXO spec is defined on page 13 of the datasheet. It is recommended that 1.2 V should me the max value and that the TCXO should not deliver more than that.
It is possible to connect a 3.3 V TCXO but we generally do not recommend that.
Thanks and regards,