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USB5744 数据表(PDF) 39 Page - Microchip Technology

部件名 USB5744
功能描述  4-Port SS/HS USB Controller Hub
PDF  49 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

USB5744 数据表(HTML) 39 Page - Microchip Technology

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 2015-2016 Microchip Technology Inc.
DS00001855D-page 39
USB5744
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



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