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7643 Datasheet(PDF) 363 Page - Renesas Technology Corp |
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7643 Datasheet(HTML) 363 Page - Renesas Technology Corp |
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363 / 424 page  7643 Group REJ09B0133-0200 APPENDIX 3.4 Countermeasure against noise Rev.2.00 Aug 28, 2006 page 40 of 98 3.4.2 Connection of bypass capacitor across VSS line and VCC line Connect an approximately 0.1 µF bypass capacitor across the VSS line and the VCC line as follows: • Connect a bypass capacitor across the VSS pin and the VCC pin at equal length. • Connect a bypass capacitor across the VSS pin and the VCC pin with the shortest possible wiring. • Use lines with a larger diameter than other signal lines for VSS line and VCC line. • Connect the power source wiring via a bypass capacitor to the VSS pin and the VCC pin. In use of the 7643 group it is recommended to connect 0.1 µF and 4.7 µF capacitors in parallel between pins Vcc and Vss, and pins AVss and AVcc. However, their capacitors must not be allocated near the LPF pin. Fig. 3.4.3 Bypass capacitor across the VSS line and the VCC line VSS VCC VSS VCC N.G. O.K. VSS (AVSS) VCC (AVCC) 4.7 µS 0.1 µS |
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