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参数资料
| 型号： | MPC9819EN |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 133.33 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO20 |
| 封装： | 0.150 INCH, 0.025 INCH PITCH, LEAD FREE, SSOP-20 |
| 文件页数： | 4/10页 |
| 文件大小： | 312K |
| 代理商： | MPC9819EN |
MPC9819 REVISION 4 JUNE 24, 2009
3
2009 Integrated Device Technology, Inc.
MPC9819 Data Sheet
CLOCK GENERATOR FOR POWERQUICC AND POWERPC MICROPROCESSORS AND MICROCONTROLLERS
Figure 2. MPC9819 20-Lead SSOP Package Pinout (Top View)
MPC9819 OPERATION
Crystal Oscillator
The MPC9819 features a fully integrated Pierce oscillator to
minimize system implementation costs. Other than the addition of a
25-MHz crystal, no external components are required.The crystal
selection should be: 25 MHz, parallel resonant type with a load
specification of CL = 10 pF. Crystals with a load specification of CL =
20 pF may be used, however, the reference frequency may be
higher than the specified 25 MHz. Externally supplied capacitors on
both the XTAL_IN and XTAL_OUT pins may be used to trim the
frequency as desired.
The crystal should be located as close to the MPC9819 XTAL_IN
and XTAL_OUT pins as possible to avoid any board level parasitic.
Power Supply Bypassing
The MPC9819 should have all VDD pins bypassed with
0.01 capacitors and a minimum of one 1.0 capacitor for the overall
package. All capacitors should be located as close to the SSOP pins
as possible.
External Clock Source
An external reference source of 25 MHz may be applied to the
XTAL_IN pin. In this mode of operation, the XTAL_OUT pin should
be left floating.
XTAL_IN
XTAL_OUT
FSEL0
VDD
FSEL1
QREF2
GND
QREF1
QREF0
VDD
QA4
QA3
GND
QA2
QA1
VDD
QA0
MR/OE
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
Table 3. Crystal Specifications
Parameter
Value
Crystal Cut
Fundamental AT Cut
Resonance
Parallel Resonance
Shunt Capacitance (CO)
5–7 pF
Load Capacitance (CL)
10 pF
Equivalent Series Resistance (ESR)
20–60
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