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7641 Datasheet(PDF) 324 Page - Renesas Technology Corp |
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7641 Datasheet(HTML) 324 Page - Renesas Technology Corp |
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324 / 385 page  Rev.2.00 Aug 28, 2006 page 45 of 108 7641 Group REJ09B0336-0200 APPENDIX 3.4 Countermeasures against noise 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 7641 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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