USB5744
DS00001855E-page 38
2015-2017 Microchip Technology Inc.
Note 7:
0 °C for commercial version, -40 °C for industrial version.
Note 8:
+70 °C for commercial version, +85 °C for industrial version.
Note 9:
This number includes the pad, the bond wire and the lead frame. PCB capacitance is not included in this
value. The
XTALI/CLK_IN
pin,
XTALO
pin and PCB capacitance values are required to accurately calcu-
late the value of the two external load capacitors. These two external load capacitors determine the accu-
racy of the 25.000 MHz frequency.
9.7.2
EXTERNAL REFERENCE CLOCK (
CLK_IN
)
When using an external reference clock, the following input clock specifications are suggested:
• 25 MHz
• 50% duty cycle ±10%, ±100 ppm
• Jitter < 100 ps RMS
