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參數(shù)資料
| 型號(hào)： | MPC972FA |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時(shí)鐘產(chǎn)生/分配 |
| 英文描述： | 125 MHz, PROC SPECIFIC CLOCK GENERATOR, PQFP52 |
| 封裝： | LQFP-52 |
| 文件頁(yè)數(shù)： | 11/13頁(yè) |
| 文件大?。?/td> | 631K |
| 代理商： | MPC972FA |
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MPC972
7
MOTOROLA
SYNC Output Description
In situations where output frequency relationships are not
integer multiples of each other there is a need for a signal for
system synchronization purposes. The SYNC output of the
MPC972 is designed to specifically address this need. The
MPC972 monitors the relationship between the Qa and the Qc
banks of outputs. It provides a low going pulse, one period in
duration, one period prior to the coincident rising edges of the
Qa and Qc outputs. The duration and the placement of the
pulse is dependent on the higher of the Qa and Qc output
frequencies. The timing diagrams in the data sheet show the
various waveforms for the SYNC output. Note that the SYNC
output is defined for all possible combinations of the Qa and Qc
outputs even though under some relationships the lower
frequency clock could be used as a synchronizing signal.
1. Programmable Output Frequency Relationships (VCO_Sel = ‘1’)
fsela1
fsela0
Qa
fselb1
fselb0
Qb
fselc1
fselc0
Qc
0
1
0
1
0
1
VCO/4
VCO/6
VCO/8
VCO/12
0
1
0
1
0
1
VCO/4
VCO/6
VCO/8
VCO/10
0
1
0
1
0
1
VCO/2
VCO/4
VCO/6
VCO/8
2. Programmable Output Frequency Relationships (VCO_Sel = ‘1’)
fselFB2
fselFB1
fselFB0
QFB
0
1
0
1
0
1
VCO/4
VCO/6
VCO/8
VCO/10
1
0
1
0
1
0
1
VCO/8
VCO/12
VCO/16
VCO/20
Figure 4. Typical Skews Relative to QFB
-400
-300
-200
-100
0
100
200
300
400
Qc3
Qc2
Qc1
Qc0
Qb3
Qb2
Qb1
Qb0
Qa3
Qa2
Qa1
Qa0
ps
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
30
40
50
60
70
80
90
100
110
I/O
Jitter
(ps)
Figure 5. Typical Phase Jitter versus Reference Frequency
I/O Jitter
Reference Clock Frequency (MHz)
VCO/4
VCO/6
VCO/8
1σ
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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MPC972
Low Voltage PLL Clock Driver
NETCOM
IDT Low Voltage PLL Clock Driver
Freescale Timing Solutions Organization has been acquired by Integrated Device Technology, Inc
MPC972
7
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