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参数资料
| 型号： | MC12430FNR2 |
| 厂商： | MOTOROLA INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 800 MHz, OTHER CLOCK GENERATOR, PQCC28 |
| 封装： | PLASTIC, LCC-28 |
| 文件页数： | 7/9页 |
| 文件大小： | 132K |
| 代理商： | MC12430FNR2 |
4
MC12430
MOTOROLA ADVANCED CLOCK DRIVERS DEVICE DATA
385
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
Note 2.
MHz
Note 1.
FMAXO
Maximum Output Frequency
VCO (Internal)
FOUT
400
50
800
MHz
Note 4.
tLOCK
Maximum PLL Lock Time
10
ms
tjitter
Period Deviation (Peak–to–Peak) Note 3.
±25
±65
ps
N = 2, 4, 8; Note 4.
N = 1; Note 4.
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%; Note 4.
1. 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.
2. 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 382 of this data sheet for
more details.
3. See Applications Information below for additional information.
4. 50
to VCC – 2.0 V pull–down.
APPLICATIONS INFORMATION
Using the On–Board Crystal Oscillator
The MC12430 features a fully integrated on–board crystal
oscillator to minimize system implementation costs. The oscil-
lator 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 recom-
mended, 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 paral-
lel 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 inaccura-
cies. In a general computer application, this level of inaccuracy
is immaterial. Table 1 below specifies the performance require-
ments of the crystals to be used with the MC12430.
Table 1. Recommended Crystal Specifications
Parameter
Value
Crystal Cut
Fundamental AT Cut
Resonance
Series Resonance*
Frequency Tolerance
±75ppm at 25°C
Frequency/Temperature Stability
±150ppm 0 to 70°C
Operating Range
0 to 70
°C
Shunt Capacitance
5–7 pF
Equivalent Series Resistance (ESR)
50 to 80
Correlation Drive Level
100
W
Aging
5 ppm/Yr (First 3 Years)
* See accompanying text for series versus parallel resonant discus-
sion.
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