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HD64F2149YV 数据表(PDF) 767 Page - Renesas Technology Corp |
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HD64F2149YV 数据表(HTML) 767 Page - Renesas Technology Corp |
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767 / 1075 page  Section 23 Clock Pulse Generator Rev. 3.00 Jan 18, 2006 page 739 of 1044 REJ09B0280-0300 Table 23.3 Crystal Resonator Parameters Frequency (MHz) 2 4 8 10 R S max (Ω) 500 120 80 70 C 0 max (pF) 77 77 Note on Board Design: When a crystal resonator is connected, the following points should be noted. Other signal lines should be routed away from the oscillator circuit to prevent induction from interfering with correct oscillation. See figure 23.4. When designing the board, place the crystal resonator and its load capacitors as close as possible to the XTAL and EXTAL pins. CL2 Signal A Signal B CL1 The chip XTAL EXTAL Avoid Figure 23.4 Example of Incorrect Board Design |
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