參數(shù)資料
型號: MC56F8157
廠商: Electronic Theatre Controls, Inc.
英文描述: 16-BIT HYBRID CONTROLLERS
中文描述: 16位混合控制器
文件頁數(shù): 141/172頁
文件大小: 2444K
代理商: MC56F8157
External Clock Operation Timing
56F8357 Technical Data, Rev. 8.0
Freescale Semiconductor
Preliminary
141
10.5 External Clock Operation Timing
Figure 10-3 External Clock Timing
10.6 Phase Locked Loop Timing
Table 10-13 External Clock Operation Timing Requirements
1
1. Parameters listed are guaranteed by design.
2. See
Figure 10-3
for details on using the recommended connection of an external clock driver.
3. The high or low pulse width must be no smaller than 8.0ns or the chip will not function.
4. External clock input rise time is measured from 10% to 90%.
5. External clock input fall time is measured from 90% to 10%.
Characteristic
Symbol
Min
Typ
Max
Unit
Frequency of operation (external clock driver)
2
f
osc
0
120
MHz
Clock Pulse Width
3
t
PW
3.0
ns
External clock input rise time
4
t
rise
10
ns
External clock input fall time
5
t
fall
10
ns
Table 10-14 PLL Timing
Characteristic
Symbol
Min
Typ
Max
Unit
External reference crystal frequency for the PLL
1
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 8MHz input crystal.
2. ZCLK may not exceed 60MHz. For additional information on ZCLK and (f
OUT
/2
)
, please refer to the OCCS chapter in
the
56F8300 Peripheral User Manual
.
3. This is the minimum time required after the PLL set up is changed to ensure reliable operation.
f
osc
4
8
8
MHz
PLL output frequency
2
(f
OUT
)
f
op
160
260
MHz
PLL stabilization time
3
-40
°
to +125
°
C
t
plls
1
10
ms
External
Clock
V
IH
V
IL
Note: The midpoint is V
IL
+ (V
IH
– V
IL
)/2.
90%
50%
10%
90%
50%
10%
t
PW
t
PW
t
fall
t
rise
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