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ST72321 数据表(PDF) 147 Page - STMicroelectronics |
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ST72321 数据表(HTML) 147 Page - STMicroelectronics |
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147 / 185 page  ST72321 147/185 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 76. Typical Application with a Crystal or Ceramic Resonator 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. Symbol Parameter Conditions Min Max Unit fOSC Oscillator Frequency 1) LP: Low power oscillator MP: Medium power oscillator MS: Medium speed oscillator HS: High speed oscillator 1 >2 >4 >8 2 4 8 16 MHz RF Feedback resistor 20 40 k Ω CL1 CL2 Recommended load capacitance ver- sus equivalent serial resistance of the crystal or ceramic resonator (RS) RS=200Ω LP oscillator RS=200Ω MP oscillator RS=200Ω MS oscillator RS=100Ω HS oscillator 22 22 18 15 56 46 33 33 pF Symbol Parameter Conditions Typ Max Unit i2 OSC2 driving current VDD=5V LP oscillator VIN=VSS MP oscillator MS oscillator HS oscillator 80 160 310 610 150 250 460 910 µA OSC2 OSC1 fOSC CL1 CL2 i2 RF ST72XXX RESONATOR WHEN RESONATOR WITH INTEGRATED CAPACITORS |
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