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STR912FAW42 Datasheet(PDF) 66 Page - STMicroelectronics |
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STR912FAW42 Datasheet(HTML) 66 Page - STMicroelectronics |
66 / 101 page Electrical characteristics STR91xFAx3x, STR91xFAx4x 66/101 7.7.1 Main oscillator electrical characteristics VDDQ = 2.7 - 3.6V, VDD = 1.65 - 2V, TA = -40 / 85 °C unless otherwise specified. 7.7.2 X1_CPU external clock source Subject to general operating conditions for VDD and TA. Figure 16. Typical application with an external clock source Table 18. Main oscillator electrical characteristics Symbol Parameter Test Conditions Value Unit Min Typ Max tSTUP(OSC) Oscillator Start-up Time VDD stable (1) 1. Data characterized with quartz crystal, not tested in production. 23 mS Table 19. External clock characteristics Symbol Parameter Test Conditions(1) 1. Data based on typical appilcation software. Value Unit Min Typ Max fX1 External clock source frequency See Figure 16 425 MHz VX1H X1 input pin high level voltage 0.7xVDD VDD V VX1L X1 input pin low level voltage VSS 0.3xVDD V tw(X1H) tw(X1L) X1 high or low time(2) 2. Data based on design simulation and/or technology characteristics, not tested in production. 6ns tr(X1) tf(X1) X1 rise or fall time(2) 20 ns IL X1 input leakage current VSS≤VIN≤VDD ±1 µA CIN(X1) X1 input capacitance(2) 5pF DuCy(X1) Duty cycle 45 55 % X1_CPU X2_CPU fOSC EXTERNAL STR91xF CLOCK SOURCE VX1L VX1H tr(T1) tf(X1) tw(X1H) tw(X1L) IL 90% 10% TX1 hi-Z |
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