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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST72334J2TA/XXX датащи(PDF) 118 Page - STMicroelectronics |
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ST72334J2TA/XXX датащи(HTML) 118 Page - STMicroelectronics |
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118 / 150 page  ST72334xx-Auto, ST72314xx-Auto, ST72124Jx-Auto 118/150 CLOCK AND TIMING CHARACTERISTICS (Cont’d) 15.5.3 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...). 15.5.3.1 Typical Crystal Resonators Figure 67. Application with a Crystal Resonator Notes: 1. Resonator characteristics given by the crystal 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 a high quality resonator with small RS value. Refer to crystal manufacturer for more details. Symbol Parameter Conditions Min Max Unit fOSC Oscillator Frequency 3) 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 38 32 18 15 56 46 26 21 pF i2 OSC2 driving current VDD=5V LP oscillator VIN=VSS MP oscillator MS oscillator HS oscillator 40 110 180 400 100 190 360 700 µA Option Byte Config. Reference Freq. Characteristic 1) CL1 [pF] CL2 [pF] tSU(osc) [ms] 2) LP S-200-30-30/50 2MHz ∆f OSC=[±30ppm25°C,±30ppm ∆Ta], Typ. RS=200Ω 33 34 10~15 MP SS3-400-30-30/30 4MHz ∆f OSC=[±30ppm25°C,±30ppm ∆Ta], Typ. RS=60Ω 33 34 7~10 MS SS3-800-30-30/30 8MHz ∆f OSC=[±30ppm25°C,±30ppm ∆Ta], Typ. RS=25Ω 33 34 2.5~3 HS SS3-1600-30-30/30 16MHz ∆f OSC=[±30ppm25°C,±30ppm ∆Ta], Typ. RS=15Ω 33 34 1~1.5 OSC2 OSC1 fOSC CL1 CL2 i2 RF ST72XXX RESONATOR |
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