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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST20-GP1 датащи(PDF) 106 Page - STMicroelectronics |
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ST20-GP1 датащи(HTML) 106 Page - STMicroelectronics |
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106 / 116 page  ST20-GP1 106/116 ® 19.4 ClockIn timings Notes 1 Measured between corresponding points on consecutive falling edges. 2 Variation of individual falling edges from their nominal times. 3 Clock transitions must be monotonic within the range VIH to VIL (see Electrical Specifica- tions). Table 19.4 ClockIn timings Figure 19.5 ClockIn timings 19.4.1 ClockIn frequency Nominal ClockIn frequency is 16.36800 Mhz ±50 ppm tolerance. This tolerance relates to the GPS system requirements and not for the device to function. Symbol Parameter Min Nom Max Units Notes tDCLDCH ClockIn pulse width low for PLL operation 18 42.5 ns tDCHDCL ClockIn pulse width high for PLL operation 18 42.5 ns tDCr ClockIn rise time for PLL operation 20 ns 3 tDCf ClockIn fall time for PLL operation 20 ns 3 tGDVCH GPSIF valid before clock rising edge 20 ns tCHGDX GPSIF valid after clock rising edge 0 ns 90% 10% tDCr 2.0V 0.8V 1.5V tDCLDCH tDCHDCL tDCf 90% 10% tGDVCH tCHGDX GPSIF |
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