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| 型号： | MPC9817ENR2 |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 66 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO20 |
| 封装： | LEAD FREE, SSOP-20 |
| 文件页数： | 3/8页 |
| 文件大小： | 97K |
| 代理商： | MPC9817ENR2 |
Advanced Clock Drivers Devices
Freescale Semiconductor
3
MPC9817
Figure 2. MPC9817 20-Lead SSOP Package Pinout (Top View)
MPC9817 OPERATION
Crystal Oscillator
The MPC9817 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 MPC9817
XTAL_IN and XTAL_OUT pins as possible to avoid any board
level parasitic.
Power Supply Bypassing
The MPC9817 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 (CL)
5–7 pF
Load Capacitance (CO)
10 pF
Equivalent Series Resistance (ESR)
20–60
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