58.4.6 3 to 20 MHz Crystal Oscillator Characteristics

Table 58-22. 3 to 20 MHz Crystal Oscillator Characteristics
Symbol Parameter Conditions Min. Typ. Max. Unit
fOSC Operating Frequency Normal mode with crystal 3 20 MHz
tSTART Startup Time 3 MHz, CSHUNT = 3 pF 40 ms
12 MHz, CSHUNT = 7 pF with CM = 1.6 fF 6 ms
20 MHz, CSHUNT = 7 pF with CM = 1.6 fF 5.7 ms
IDDON Current Consumption (on VDDIO) 3 MHz 230 µA
12 MHz 390 µA
20 MHz 450 µA
CL Internal Equivalent Load Capacitance Integrated Load Capacitance 7.5 9 10.5 pF
(XIN and XOUT in series)
Figure 58-10. 3 to 20 MHz Crystal Oscillator Schematics

CLEXT = 2 × (CCRYSTAL – CL – CPCB)

where, CPCB is the capacitance of the printed circuit board (PCB) track layout from the crystal to the pin.