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ST20-GP6 Folha de dados(PDF) 112 Page - STMicroelectronics

Nome de Peças ST20-GP6
Descrição Electrónicos  GPS PROCESSOR
PDF  123 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
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ST20-GP6 Folha de dados(HTML) 112 Page - STMicroelectronics

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20.4 ClockIn timings
Notes
1
Clock transitions must be monotonic within the range VIH to VIL (see Electrical Specifica-
tions Chapter 18 on page 102).
2
In TimesOneMode, excursions from a 50/50 mark-space ratio will map directly into EMI
phases which will then not be of equal duration.
Table 20.4
ClockIn timings
Figure 20.4
ClockIn timings
20.4.1 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
20
40
ns
1, 2
tDCHDCL
ClockIn pulse width high for PLL operation
20
40
ns
1, 2
tDCr
ClockIn rise time for PLL operation
20
ns
1
tDCf
ClockIn fall time for PLL operation
20
ns
1
tGDVCH
GPSIF valid before clock rising edge
20
ns
tCHGDX
GPSIF valid after clock rising edge
10
ns
90%
10%
tDCr
2.0V
0.8V
1.5V
tDCLDCH
tDCHDCL
tDCf
90%
10%
tGDVCH tCHGDX
GPSIF



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