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ST72561AR7-Auto Datasheet(PDF) 280 Page - STMicroelectronics |
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ST72561AR7-Auto Datasheet(HTML) 280 Page - STMicroelectronics |
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280 / 324 page  Electrical characteristics ST72561-Auto 280/324 Doc ID 12370 Rev 8 20.5.1 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 external components. In the application, the resonator 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 stabilization time. Refer to the crystal/ceramic resonator manufacturer for more details (frequency, package, accuracy...)(a)(b). Figure 123. Typical application with a crystal or ceramic resonator a. Resonator characteristics given by the crystal/ceramic resonator manufacturer. b. 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). Table 104. Oscillator characteristics Symbol Parameter Conditions Min Max Unit fOSC Oscillator Frequency(1) 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. 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 versus 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 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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