st20-gp1 STMicroelectronics, st20-gp1 Datasheet - Page 106

• Manufacturer Part Number: st20-gp1
• Description: Gps Processor
• Manufacturer: STMicroelectronics

ST20-GP1
19.4 ClockIn timings
Notes
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.
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Symbol
t
t
t
t
t
t
DCLDCH
DCHDCL
DCr
DCf
GDVCH
CHGDX
1
2
3
GPSIF
Measured between corresponding points on consecutive falling edges.
Variation of individual falling edges from their nominal times.
Clock transitions must be monotonic within the range V
tions).
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 19.5 ClockIn timings
Table 19.4 ClockIn timings
t
DCLDCH
t
GDVCH
t
CHGDX
90%
10%
t
DCHDCL
Min
18
18
20
0
t
DCr
IH
Nom
to V
IL
(see Electrical Specifica-
Max
42.5
42.5
20
20
Units
ns
ns
ns
ns
ns
ns
Notes
3
3