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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST72325 датащи(PDF) 150 Page - STMicroelectronics |
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ST72325 датащи(HTML) 150 Page - STMicroelectronics |
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150 / 196 page  150/196 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 is based on characterization results with specified typical ex- ternal components. In the application, the resona- tor 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...). Notes: 1. The oscillator selection can be optimized in terms of supply current using an high quality resonator with small RS value. Refer to crystal/ceramic resonator manufacturer for more details. 2. Data based on characterisation results, not tested in production. Symbol Parameter Conditions Min Max Unit fOSC Oscillator Frequency 1) 116 MHz RF Feedback resistor2) 20 40 k Ω CL1 CL2 Recommended load capacitance ver- sus equivalent serial resistance of the crystal or ceramic resonator (RS) 3) fOSC= 1 to 2 MHz fOSC= 2 to 4 MHz fOSC= 4 to 8 MHz fOSC= 8 to 16 MHz 20 20 15 15 60 50 35 35 pF Symbol Parameter Conditions Typ Max Unit i2 OSC2 driving current VDD=5V: fOSC= 2MHz, C0 = 6pF, Cl1 = Cl2 = 68pF fOSC= 4MHz, C0 = 6pF, Cl1 = Cl2 = 68pF fOSC= 8MHz, C0 = 6pF, Cl1 = Cl2 = 40pF fOSC= 16MHz, C0 = 7pF, Cl1 = Cl2 = 20pF 426 425 456 660 µA |
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