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ST7MC1 データシート(PDF) 256 Page - STMicroelectronics |
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ST7MC1 データシート(HTML) 256 Page - STMicroelectronics |
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256 / 308 page  ST7MC1/ST7MC2 256/308 CLOCK AND TIMING CHARACTERISTICS (Cont’d) 12.5.3 Crystal and Ceramic Resonator Oscillators The ST7 internal clock can be supplied with four different Crystal/Ceramic resonator oscillators. All the information given in this paragraph are based on characterization results with specified typical external components. In the application, the reso- nator and the load capacitors have to be placed as close as possible to the oscillator pins in order to minimize output distortion and start-up stabiliza- tion time. Refer to the crystal/ceramic resonator manufacturer for more details (frequency, pack- age, accuracy...). Figure 136. Typical Application with a Crystal or Ceramic Resonator Notes: 1. When PLL is used, please refer to the PLL characteristics chapter and to the “supply, reset and clock management” description chapter (fOSC min. is 8 Mhz with PLL). 2. Resonator characteristics given by the ceramic resonator manufacturer. For more information on these resonators, please consult www.murata.com 3. SMD = [-R0: Plastic tape package (ý =180mm), -B0: Bulk] LEAD = [-A0: Flat pack package (Radial taping Ho= 18mm), -B0: Bulk] Symbol Parameter Conditions Min Typ Max Unit fOSC Oscillator Frequency 1) 416 MHz RF Feedback resistor 92 k Ω CL1 CL2 Recommended load capacitance ver- sus equivalent serial resistance of the crystal or ceramic resonator (RS) See table below pF Supplier fOSC (MHz) Typical Ceramic Resonators2) CL1 [pF] CL2 [pF] Reference 3) 4 CSTCR4M00G53-R0 (15) (15) 8 CSTCE8M00G52-R0 (10) (10) 16 CSTCE16M0V53-R0 (15) (15) OSC2 OSC1 fOSC CL1 CL2 i2 RF ST7FMC RESONATOR WHEN RESONATOR WITH INTEGRATED CAPACITORS |
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