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參數(shù)資料
| 型號： | MC12430FA |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 時鐘產(chǎn)生/分配 |
| 英文描述： | 800 MHz, OTHER CLOCK GENERATOR, PQFP32 |
| 封裝： | LQFP-32 |
| 文件頁數(shù)： | 7/9頁 |
| 文件大小： | 165K |
| 代理商： | MC12430FA |
MC12430
FREESCALE SEMICONDUCTOR ADVANCED CLOCK DRIVERS DEVICE DATA
367
APPLICATIONS INFORMATION
Using the On-Board Crystal Oscillator
The MC12430 features a fully integrated on-board crystal
oscillator to minimize system implementation costs. The
oscillator is a series resonant, multivibrator type design as
opposed to the more common parallel resonant oscillator
design. The series resonant design provides better stability and
eliminates the need for large on chip capacitors. The oscillator
is totally self contained so that the only external component
required is the crystal. As the oscillator is somewhat sensitive to
loading on its inputs the user is advised to mount the crystal as
close to the MC12430 as possible to avoid any board level
parasitics. To facilitate co-location surface mount crystals are
recommended, but not required.
The oscillator circuit is a series resonant circuit and thus for
optimum performance a series resonant crystal should be used.
Unfortunately, most crystals are characterized in a parallel
resonant mode. Fortunately, there is no physical difference
between a series resonant and a parallel resonant crystal. The
difference is purely in the way the devices are characterized. As
a result, a parallel resonant crystal can be used with the
MC12430 with only a minor error in the desired frequency. A
parallel resonant mode crystal used in a series resonant circuit
will exhibit a frequency of oscillation a few hundred ppm lower
than specified, a few hundred ppm translates to kHz
inaccuracies. In a general computer application, this level of
inaccuracy is immaterial. Table 1 below specifies the
performance requirements of the crystals to be used with the
MC12430.
Table 5. AC Characteristics (TA = 0° to 70°C, VCC = 3.3V to 5.0V ±5%)
Symbol
Characteristic
Min
Max
Unit
Condition
FMAXI
Maximum Input Frequency
S_CLOCK
Xtal Oscillator
FREF_EXT
10
20
Note1
1.
Maximum frequency on FREF_EXT is a function of the internal M counter limitations. The phase detector can handle up to 100MHz on the input,
but the M counter must remain in the valid range of 200
≤ M ≤ 400. See the Programming Interface section on page 4 of this data sheet for more
details.
MHz
Note 2
2.
10MHz is the maximum frequency to load the feedback divide registers. S_CLOCK can be switched at higher frequencies when used as a test
clock in TEST_MODE 6.
FMAXO
Maximum Output Frequency
VCO (Internal)
FOUT
400
–50
800
MHz
Note 3
3.
50
to V
CC – 2.0V pulldown.
tLOCK
Maximum PLL Lock Time
10
ms
tjitter
Period Deviation (Peak-to-Peak)4
4.
See APPLICATIONS INFORMATION for additional information.
±25
±65
ps
N = 2, 4, 8: Note3
N = 1; Note3
ts
Setup Time
S_DATA to S_CLOCK
S_CLOCK to S_LOAD
M, N to P_LOAD
20
ns
th
Hold Time
S_DATA to S_CLOCK
M, N to P_LOAD
20
ns
tpwMIN
Minimum Pulse Width
S_LOAD
P_LOAD
50
ns
tr, tf
Output Rise/Fall
FOUT
300
800
ps
20%-80%, Note3
Table 6. Recommended Crystal Specifications
Parameter
Value
Crystal Cut
Fundamental AT Cut
Resonance
Series Resonance1
1.
See accompanying text for series versus parallel resonant
discussion.
Frequency Tolerance
±75ppm at 25°C
Frequency/Temperature Stability
±150pm 0 to 70°C
Operating Range
0 to 70
°C
Shunt Capacitance
5–7pF
Equivalent Series Resistance (ESR)
50 to 80
Correlation Drive Level
100
W
Aging
5ppm/Yr (First 3 Years)
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