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PCK12429A Datasheet(PDF) 8 Page - NXP Semiconductors

Part # PCK12429A
Description  25-400 MHz differential PECL clock generator
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCK12429A Datasheet(HTML) 8 Page - NXP Semiconductors

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Product data
PCK12429
25–400 MHz differential PECL clock generator
2002 Jun 03
8
AC CHARACTERISTICS (Tamb = 0 to 70 °C, VCC = 3.3 V ± 5%)
SYMBOL
PARAMETER
TEST CONDITIONS
LIMITS
Tamb = 0 to +70 °C
UNIT
MIN
MAX
F
Maximum Input Frequency
S_CLOCK
Note 1
10
MHz
FMAXI
Maximum Input Frequency
Xtal Oscillator
Note 1
10
20
MHz
F
O
Maximum Output Frequency
VCO (Internal)
Note 2
200
400
MHz
FMAXO
Maximum Output Frequency
FOUT
Note 2
25
400
MHz
tLOCK
Maximum PLL Lock Time
10
ms
tjitter
RMS jitter (peak-to-peak)
Note 2
See Applications Section
±25
ps
S_DATA to
S_CLOCK
20
ts
Setup Time
S_CLOCK TO
S_LOAD
20
ns
M, N to P_LOAD
20
tn
Hold Time
S_DATA to
S_CLOCK
20
ns
n
M, N to P_LOAD
20
tpw
Minimum Pulse Width
S_LOAD
Note 2
50
ns
tpwMIN
Minimum Pulse Width
P_LOAD
Note 2
50
ns
tr, tf
Output Rise/Fall
FOUT
20%–80%, Note 2
100
400
ps
Duty Cycle
45
55
%
NOTES:
1. 10 MHz is the maximum frequency to load the feedback device registers. S_CLOCK can be switched at higher frequencies when used as a
test clock in TEST_MODE 6. Crystal frequency of 16MHz verified at productiontest. 10 to 20MHz operationguaranteed by design.
2. 50
Ω to VCC–2.0 V pulldown.
APPLICATIONS INFORMATION
Using the on-board crystal oscillator
The PCK12429 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 PCK12429 as possible to avoid
any board level parasitics. To facilitate co-location surface mount
crystals are recommended, but not required. Because the series
resonant design is affected by capacitive loading on the XTAL
terminals, loading variation introduced by crystals from different
vendors could be a potential issue.
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 PCK12429 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 2 specifies the
performance requirements of the crystals to be used with the
PCK12429.
Table 2. Test modes
PARAMETER
VALUE
Crystal Cut
Fundamental AT Cut
Resonance
Series Resonance*
Frequency Tolerance
±75 ppm at 25 °C
Frequency/Temperature Stability
±150 pm 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
µW
Aging
5 ppm/Yr (first 3 years)
NOTE:
*
See accompanying text for series versus parallel resonant
discussion.


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