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MPC992 Datasheet(PDF) 4 Page - Motorola, Inc

Part No. MPC992
Description  LOW VOLTAGE PLL CLOCK DRIVER
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Maker  MOTOROLA [Motorola, Inc]
Homepage  http://www.freescale.com
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MPC992 Datasheet(HTML) 4 Page - Motorola, Inc

   
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MPC992
MOTOROLA
TIMING SOLUTIONS
BR1333 — REV 5
4
DC CHARACTERISTICS (TA = 0° to 70°C, VCC = 3.3V ±5%)
Symbol
Characteristic
Min
Typ
Max
Unit
Condition
VIH
Input HIGH Voltage
PECL_CLK1
Other
2.15
2.0
2.4
VCC
V
VCC = 3.3V
VIL
Input LOW Voltage
PECL_CLK1
Other
1.5
0
1.8
0.8
V
VCC = 3.3V
VOH
Output HIGH Voltage1
1.8
2.4
V
VCC = 3.3V
VOL
Output LOW Voltage1
1.2
1.7
V
VCC = 3.3V
IIN
Input Current
–120
120
µA
ICCI
Maximum Quiescent Supply Current
130
150
mA
ICCA
Maximum PLL Supply Current
15
20
mA
1. DC levels will vary 1:1 with VCC.
AC CHARACTERISTICS (TA = 0° to 70°C, VCC = 3.3V ±5%)
Symbol
Characteristic
Min
Typ
Max
Unit
Condition
tr, tf
Output Rise/Fall Time
200
850
ps
20% to 80%
tpw1
Output Duty Cycle
49
51
%
tpw2
SYNC Output Duty Cycle
0.95
1.05
%
PCLK Period
fref
Input Reference Frequency
Xtal
FREF
10
Note 2
20
Note 2
MHz
tos
Output-to-Output Skew
Qa, Qb
Qa (–) to SYNC (+)
100
300
ps
fVCO
PLL VCO Lock Range
200
400
440
750
MHz
VCO_SEL = 1
VCO_SEL = 0
fmax
Maximum Output Frequency
Qa (
÷2)
Qa,Qb (
÷4)
Qb (
÷6)
Qb (
÷10)
375
187.5
125
75
MHz
Note 1
tjitter
Cycle–to–Cycle Jitter (Peak–to–Peak)
±25
±50
ps
Note 3
tlock
Maximum PLL Lock Time
10
ms
1. At 400MHz the output swing will be less than the nominal value.
2. ECLK and XTAL input reference limited by the feedback divide and the guaranteed VCO lock range.
3. Guaranteed by characterization.
APPLICATIONS INFORMATION
Using the On–Board Crystal Oscillator
The MPC992 features an on–board crystal oscillator to
allow for seed clock generation as well as final distribution.
The on–board oscillator is completely 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 MPC992
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 as
opposed to the more common parallel resonant circuit, this
eliminates the need for large on–board capacitors. Because
the design is a series resonant design, for optimum
frequency accuracy a series resonant crystal should be used
(see specification table below). Unfortunately most off the
shelf crystals are characterized in a parallel resonant mode.
However a parallel resonant crystal is physically no different
than a series resonant crystal, a parallel resonant crystal is
simply a crystal which has been characterized in its parallel
resonant mode. Therefore in the majority of cases a parallel
specified crystal can be used with the MPC992 with just a
minor frequency error due to the actual series resonant
frequency of the parallel resonant specified crystal. Typically


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