PT7C4363BQRecommended Layout for CrystalNote : The crystal, traces and crystal input pins should be isolated from RF generating signals. Built-in Capacitors Specifications and Recommended External CapacitorsParameterSymbolTyp.Unit Build-in capacitors X1 to GND CG 5 pF X2 to GND CD 20 pF Recommended External X1 to GND C1 20 pF capacitors X2 to GND C2 0 pF Note : The frequency of crystal can be optimized by external capacitor C1 and C2, for frequency=32.768Hz, C1 and C2 should meet the equation as below: Cpar + [(C1+CG)*(C2+CD)]/ [(C1+CG)+(C2+CD)] =CL Cpar is all parasitical capacitor between X1 and X2. CL is crystal’s load capacitance. Crystal SpecificationsParameterSymbolMin.Typ.Max.Unit Nominal Frequency fO - 32.768 - kHz Series Resistance ESR - - 100 kΩ Load Capacitance CL - 12.5 - pF
PT7C4363BQ www.diodes.com July 2019 Document Number DS42042 Rev 1-2 8