st20-gp6 STMicroelectronics, st20-gp6 Datasheet - Page 112

• Manufacturer Part Number: st20-gp6
• Description: Gps Processor
• Manufacturer: STMicroelectronics

ST20-GP6
20.4 ClockIn timings
Notes
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.
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Symbol
t
t
t
t
t
t
DCLDCH
DCHDCL
DCr
DCf
GDVCH
CHGDX
1
2
GPSIF
Clock transitions must be monotonic within the range V
tions Chapter 18 on page 102).
In TimesOneMode, excursions from a 50/50 mark-space ratio will map directly into EMI
phases which will then not be of equal duration.
90%
10%
Parameter
ClockIn pulse width low for PLL operation
ClockIn pulse width high for PLL operation
ClockIn rise time for PLL operation
ClockIn fall time for PLL operation
GPSIF valid before clock rising edge
GPSIF valid after clock rising edge
2.0V
1.5V
0.8V
t
DCf
Figure 20.4 ClockIn timings
Table 20.4 ClockIn timings
t
DCLDCH
t
GDVCH
t
CHGDX
90%
10%
t
DCHDCL
Min
20
20
20
10
t
DCr
IH
Nom
to V
IL
(see Electrical Specifica-
Max
40
40
20
20
Units
ns
ns
ns
ns
ns
ns
Notes
1, 2
1, 2
1
1