External Clock Crystal and Circuitry

Zynq UltraScale+ Device Technical Reference Manual (UG1085)

Document ID
UG1085
Release Date
2022-09-15
Revision
2.3 English

The typical crystal used for the RTC is a 20 ppm, 32.768 kHz crystal (This Figure). Using the RTC calibration mechanism, the effective inaccuracy is reduced to less than two. Using a 65.536 kHz crystal further reduces the effective calibration inaccuracy to less than 1 ppm.

Figure 7-3:      Crystal Circuit Example

X-Ref Target - Figure 7-3

X17682-crystal-circuit.jpg