MPC9230EI IDT, Integrated Device Technology Inc, MPC9230EI Datasheet - Page 11

• Manufacturer Part Number: MPC9230EI
• Description: IC CLK SYNTH LV PECL 28-PLCC
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Clock/Frequency Synthesizerr

Specifications of MPC9230EI

• Pll: Yes
• Input: Crystal
• Output: LVPECL
• Number Of Circuits: 1
• Ratio - Input:output: 1:1
• Differential - Input:output: No/Yes
• Frequency - Max: 750MHz
• Divider/multiplier: Yes/No
• Voltage - Supply: 3.135 V ~ 3.465 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-PLCC
• Frequency-max: 800MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

MPC9230 Data Sheet
and bypass schemes discussed in this section should be adequate
to eliminate power supply noise related problems in most designs.
Using the On-Board Crystal Oscillator
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 MPC9230 as possible to avoid any
board level parasitics. To facilitate co-location, surface mount
crystals are recommended but not required. Because the series
MPC9230 REVISION 8 MARCH 29, 2010
The MPC9230 features a fully integrated on-board crystal
Figure 6. PCB Board Layout Recommendation for
XTAL
CF
C2
the PLCC28 Package
C1
1
C1
= V
= GND
= Via
CC
11
resonant design is affected by capacitive loading on the XTAL
terminals, loading variation introduced by crystals from different
vendors could be a potential issue. For crystals with a higher shunt
capacitance, it may be required to place a resistance across the
terminals to suppress the third harmonic. Although typically not
required, it is a good idea to layout the PCB with the provision of
adding this external resistor. The resistor value will typically be
between 500 and 1 KΩ.
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 MPC9230 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
inaccuracy is immaterial.
requirements of the crystals to be used with the MPC9230.
Table 14. Recommended Crystal Specifications
Crystal Cut
Resonance
Frequency Tolerance
Frequency/Temperature Stability
Operating Range
Shunt Capacitance
Equivalent Series Resistance (ESR)
Correlation Drive Level
Aging
1. See accompanying text for series versus parallel resonant
The oscillator circuit is a series resonant circuit and thus for
discussion.
Parameter
800MHZ LOW VOLTAGE PECL CLOCK SYNTHESIZER
Table 14
©2010 Integrated Device Technology, Inc.
below specifies the performance
Fundamental AT Cut
Series Resonance
±75 ppm at 25°C
±150 pm 0 to 70°C
0 to 70°C
5–7 pF
50 to 80 Ω
100 µΩ
5 ppm/Yr (First 3 Years)
Value
at
(1)
this level of