参数资料
型号: MC56F8247MLH
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 60 MHz, MICROCONTROLLER, PQFP64
封装: 10 X 10 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, PLASTIC, MS-026BCD, LQFP-64
文件页数: 54/88页
文件大小: 4050K
代理商: MC56F8247MLH
MC56F825x/MC56F824x Digital Signal Controller, Rev. 3
Specifications
Freescale Semiconductor
58
Figure 17. External Clock Timing
7.14
Phase Locked Loop Timing
External clock input rise time4
trise
——
3
ns
External clock input fall time5
tfall
——
3
ns
Input high voltage overdrive by an external clock
Vih
0.85VDD
——
V
Input high voltage overdrive by an external clock
Vil
——
0.3VDD
V
1 Parameters listed are guaranteed by design.
2 See Figure 17 for details on using the recommended connection of an external clock driver.
3 The chip may not function if the high or low pulse width is smaller than 6.25 ns.
4 External clock input rise time is measured from 10% to 90%.
5 External clock input fall time is measured from 90% to 10%.
Table 30. Phase Locked Loop Timing
Characteristic
Symbol
Min
Typ
Max
Unit
PLL input reference frequency1
1 An externally supplied reference clock should be as free as possible from any phase jitter for the PLL to work correctly. The
PLL is optimized for 8 MHz input.
fref
48
8
MHz
PLL output frequency2
2 The core system clock operates at 1/6 of the PLL output frequency.
fop
120
240
MHz
PLL lock time3 4
3 This is the time required after the PLL is enabled to ensure reliable operation.
4 From powerdown to powerup state at 60 MHz system clock state.
tplls
—40
100
s
Accumulated jitter using an 8 MHz external crystal as the PLL source5
5 This is measured on the CLKO signal (programmed as system clock) over 264 system clocks at 60 MHz system clock
frequency and using an 8 MHz oscillator frequency.
JA
——
TBD
%
Cycle-to-cycle jitter
tjitterpll
—350
ps
Table 29. External Clock Operation Timing Requirements1 (continued)
Characteristic
Symbol
Min
Typ
Max
Unit
90%
50%
10%
90%
50%
10%
External
Clock
tPW
tfall
trise
VIL
VIH
Note: The midpoint is VIL + (VIH – VIL)/2.
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相关代理商/技术参数
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