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ST7262 数据表(PDF) 106 Page - STMicroelectronics |
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ST7262 数据表(HTML) 106 Page - STMicroelectronics |
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106 / 139 page  106/139 CLOCK AND TIMING CHARACTERISTICS (Cont’d) 12.5.3 External Clock Source Note: 1. Refer to Figure 58 for more information. Figure 58. Typical Application with an External Clock Source 12.5.4 Crystal Oscillator Output Drive Level Figure 59. Typical Application with a Crystal Resonator Symbol Parameter Conditions Min Typ Max Unit VOSCINH OSCIN input pin high level voltage see Figure 58 0.7xVDD VDD V VOSCINL OSCIN input pin low level voltage VSS 0.3xVDD tw(OSCINH) tw(OSCINL) OSCIN high or low time 1) 15 ns tr(OSCIN) tf(OSCIN) OSCIN rise or fall time1) 15 IL OSCx Input leakage current VSS≤VIN≤VDD ±1 µA OSCIN OSCOUT fOSC EXTERNAL ST72XXX CLOCK SOURCE Not connected internally VOSCINL VOSCINH tr(OSCIN) tf(OSCIN) tw(OSCINH) tw(OSCINL) IL 90% 10% Symbol Parameter Conditions Typ Unit POSCOUT Oscillator OSCOUT pin drive level At 5V / 25°C 1 mW OSCOUT OSCIN fOSC CL1 CL2 i2 RF ST72XXX RESONATOR 200 Ω<R S<400Ω |
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