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參數(shù)資料
| 型號： | MPC9819SDR2 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 時鐘產(chǎn)生/分配 |
| 英文描述： | 133 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO20 |
| 封裝： | SSOP-20 |
| 文件頁數(shù)： | 4/10頁 |
| 文件大?。?/td> | 251K |
| 代理商： | MPC9819SDR2 |
Advanced Clock Drivers Devices
Freescale Semiconductor
3
MPC9819
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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