CY2213 Clock Input

Question: My application uses an oscillator to drive the input clock (Xin, Xout) of the CY2213, what are the specifications for this signal (Vih, Vil)? Should the reference clock be connected directly to the Xin pin and leave the Xout pin floating?

 

Answer:


For added margin, we would generally like to see a VDD/2  /- 1V swing. For a 3.3V VDD this would be a 0.65V to 2.65V swing, but as long as you go through the VDD/2 threshold the CY2213 will oscillate. The reference should be connected to XIN and XOUT should be left floating.