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STR71XF 数据表(PDF) 42 Page - STMicroelectronics |
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STR71XF 数据表(HTML) 42 Page - STMicroelectronics |
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42 / 78 page ![]() Electrical parameters STR71xF 42/78 Notes: 1. Data based on design simulation and/or technology characteristics, not tested in production. Table 19. RTCXT1 external clock characteristics Symbol Parameter Conditions Min Typ Max Unit fRTCXT1 External clock source frequency 0 500 kHz VRTCXT1H RTCXT1 input pin high level voltage 0.7xV33 V33 V VRTCXT1L RTCXT1 input pin low level voltage VSS 0.3xV33 tw(RTCXT1) tw(RTCXT1) RTCXT1 high or low time 1) 100 ns tr(RTCXT1) tf(RTCXT1) RTCXT1 rise or fall time 1) 5 CIN(RTCXT1) RTCXT1 input capacitance1) 5pF DuCy(RTCXT1) Duty cycle 30 70 % IL RTCXT1 Input leakage current VSS≤VIN≤V33 ±1 µA |
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