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PIC16LC554 数据表(PDF) 44 Page - Microchip Technology |
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PIC16LC554 数据表(HTML) 44 Page - Microchip Technology |
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44 / 96 page  PIC16C55X(A) DS40143B-page 44 Preliminary © 1997 Microchip Technology Inc. FIGURE 7-11: EXTERNAL POWER-ON RESET CIRCUIT (FOR SLOW VDD POWER-UP) Note 1: External power-on reset circuit is required only if VDD power-up slope is too slow. The diode D helps discharge the capaci- tor quickly when VDD powers down. 2: < 40 k Ω is recommended to make sure that voltage drop across R does not vio- late the device’s electrical specification. 3: R1 = 100 Ω to 1 kΩ will limit any current flowing into MCLR from external capaci- tor C in the event of MCLR/VPP pin break- down due to Electrostatic Discharge (ESD) or Electrical Overstress (EOS). C R1 R D VDD MCLR PIC16C55X(A) VDD |
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