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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST10F272M датащи(PDF) 148 Page - STMicroelectronics |
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ST10F272M датащи(HTML) 148 Page - STMicroelectronics |
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148 / 175 page  Electrical characteristics ST10F272M 148/176 24.8.11 Main oscillator specifications VDD = 5V ± 10%, VSS = 0V, TA = -40 to +125°C Figure 47. Crystal oscillator and resonator connection diagram The given values of CA do not include the stray capacitance of the package and of the printed circuit board: the negative resistance values are calculated assuming additional 5pF to the values in the table. The crystal shunt capacitance (C0) and the package capacitance between XTAL1 and XTAL2 pins is globally assumed equal to 10pF. The external resistance between XTAL1 and XTAL2 is not necessary, since already present on the silicon. Table 64. Main oscillator characteristics Symbol Parameter Conditions Value Unit Min Typ Max gm Oscillator Transconductance 1.4 2.6 4.2 mA/V VOSC Oscillation Amplitude(1) 1. Not 100% tested, guaranteed by design characterization Peak to Peak – 1.5 – V VAV Oscillation Voltage level(1) Sine wave middle – 0.8 – V tSTUP Oscillator Start-up Time(1) Stable VDD - Crystal – 6 10 ms Stable VDD - Resonator – 12ms Table 65. Main oscillator negative resistance (module) CA = 15pF CA = 25pF CA = 35pF Min Typ Max Min Typ Max Min Typ Max 4 MHz 545 Ω 1035 Ω – 550 Ω 1050 Ω – 430 Ω 850 Ω – 8 MHz 240 Ω 450 Ω – 170 Ω 350 Ω – 120 Ω 250 Ω – CA CA Crystal Resonator ST10F272M ST10F272M |
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