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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ST7SCR 데이터시트(PDF) 81 Page - STMicroelectronics |
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ST7SCR 데이터시트(HTML) 81 Page - STMicroelectronics |
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81 / 102 page  ST7SCR 81/102 CLOCK AND TIMING CHARACTERISTICS (Cont’d) 14.4.3 Crystal Resonator Oscillators The ST7 internal clock is supplied with one Crystal resonator oscillator. All the information given in this paragraph are based on characterization re- sults with specified typical external componants. In the application, the resonator and the load capaci- tors 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 resonator manufacturer for more details (frequen- cy, package, accuracy...). Figure 39. Typical Application with a Crystal Resonator Notes: 1. Resonator characteristics given by the crystal 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 resonator manufacturer for more details. Symbol Parameter Conditions Min Typ Max Unit fOSC Oscillator Frequency 3) MP: Medium power oscillator 4 MHz RF Feedback resistor 20 40 k Ω CL1 CL2 Recommanded load capaci- tances versus equivalent se- rial resistance of the crystal resonator (RS) See Table 4 on page 20 (MP oscillator) 22 56 pF i2 OSC2 driving current VDD=5V VIN=VSS (MP oscillator) 110 190 µA Oscil. Typical Crystal Resonator CL1 [pF] CL2 [pF] tSU(osc) [ms] 2) Reference Freq. Characteristic 1) MP JAUCH SS3-400-30-30/30 4MHz ∆f OSC=[±30ppm25°C,±30ppm ∆Ta], Typ. RS=60Ω 33 34 7~10 OSC2 OSC1 fOSC CL1 CL2 i2 RF ST7XXX RESONATOR WHEN RESONATOR WITH INTEGRATED CAPACITORS |
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