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FT905 Datasheet(PDF) 40 Page - Future Technology Devices International Ltd. |
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FT905 Datasheet(HTML) 40 Page - Future Technology Devices International Ltd. |
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40 / 56 page ![]() Copyright © 2014 Future Technology Devices International Limited 40 FT905 _6_7_8/6/7/8 Embedded Microcontroller Datasheet Version 1.0 Document No.: FT_001131 Clearance No.: FTDI#422 5.3 AC Characteristics AC Characteristics (Ambient Temperature = -40°C to +85°C) System clock dynamic characteristics Parameter Value Unit Minimum Typical Maximum Crystal oscillator Clock frequency - 12.00 - MHz External clock input external clock jitter - - 500 ps clock duty cycle 45 50 55 % Input voltage on pin XI/CLKIN - 3.3 - V Table 5-9 System clock characteristics Note: Recommended accuracy of the clock frequency is 50ppm for the crystal. RTC clock dynamic characteristics Parameter Value Unit Minimum Typical Maximum Crystal oscillator Clock frequency - 32768 - Hz External clock input external clock jitter - - 500 ps clock duty cycle 45 50 55 % Startup time - 0.5 5 s Input voltage on pin RTC_XI/RTC_CLKIN - 1.2 - V Table 5-10 RTC clock characteristics Analog USB I/O pins dynamic characteristics Parameter Description Minimum Typical Maximum Units Conditions Driver characteristic for high speed Thsr High speed differential rise time 500 - - ps - |
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