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ST72361 bảng dữ liệu(PDF) 187 Page - STMicroelectronics |
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ST72361 bảng dữ liệu(HTML) 187 Page - STMicroelectronics |
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187 / 224 page  ST72361 187/224 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...). 1)2) Figure 100. Typical Application with a Crystal or Ceramic Resonator Notes: 1. Resonator characteristics given by the crystal/ceramic resonator manufacturer. 2. tSU(OSC) is the typical oscillator start-up time measured between VDD = 2.8V and the fetch of the first instruction (with a quick VDD ramp-up from 0 to 5V (< 50µs). 3. 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 Frequency3) 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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