Voltage Levels for CMOS XTAL Inputs, CY2292 | Cypress Semiconductor
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Voltage Levels for CMOS XTAL Inputs, CY2292
What are the acceptable voltage levels for the CMOS XTAL inputs?
The level required at XTALIN is +/- 1 Volt centered around VDD/2. This is the tolerance that we suggest, essentially the comparison of the reference and feedback signal is done at the rising edges at VDD/2 level.