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參數(shù)資料
| 型號： | MPC9351FAR2 |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時鐘及定時 |
| 英文描述： | 9351 SERIES, PLL BASED CLOCK DRIVER, 9 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP32 |
| 封裝： | 7 X 7 MM, PLASTIC, LQFP-32 |
| 文件頁數(shù)： | 9/10頁 |
| 文件大?。?/td> | 356K |
| 代理商： | MPC9351FAR2 |
MPC9351
MOTOROLA ADVANCED CLOCK DRIVERS DEVICE DATA
114
mum of 2.325V (VCC=3.3V or VCC=2.5V) must be maintained
on the VCCA pin. The resistor RF shown in Figure 6 “VCCA
Power Supply Filter” must have a resistance of 270
W
(VCC=3.3V) or 9-10W (VCC=2.5V) to meet the voltage drop cri-
teria.
Figure 6. VCCA Power Supply Filter
VCCA
VCC
MPC9351
10 nF
RF = 270 for VCC = 3.3V
RF = 9-10 for VCC = 2.5V
CF
33...100 nF
RF
VCC
CF = 1 F for VCC = 3.3V
CF = 22 F for VCC = 2.5V
The minimum values for RF and the and the filter capacitor
CF are defined by the required filter characteristics: the RC
filter should provide an attenuation greater than 40 dB for noise
whose spectral content is above 100 kHz. In the example RC
filter shown in Figure 6 “VCCA Power Supply Filter”, the filter
cut-off frequency is around 3-5 kHz and the noise attenuation
at 100 kHz is better than 42 dB.
As the noise frequency crosses the series resonant point of
an individual capacitor its overall impedance begins to look
inductive and thus increases with increasing frequency. The
parallel capacitor combination shown ensures that a low im-
pedance path to ground exists for frequencies well above the
bandwidth of the PLL. Although the MPC9351 has several de-
sign features to minimize the susceptibility to power supply
noise (isolated power and grounds and fully differential PLL)
there still may be applications in which overall performance is
being degraded due to system power supply noise. The power
supply filter schemes discussed in this section should be ade-
quate to eliminate power supply noise related problems in
most designs.
Driving Transmission Lines
The MPC9351 clock driver was designed to drive high
speed signals in a terminated transmission line environment.
To provide the optimum flexibility to the user the output drivers
were designed to exhibit the lowest impedance possible. With
an output impedance of less than 20
the drivers can drive
either parallel or series terminated transmission lines. For
more information on transmission lines the reader is referred to
Motorola application note AN1091. In most high performance
clock networks point-to-point distribution of signals is the meth-
od of choice. In a point-to-point scheme either series termi-
nated or parallel terminated transmission lines can be used.
The parallel technique terminates the signal at the end of the
line with a 50
resistance to VCC÷2.
This technique draws a fairly high level of DC current and
thus only a single terminated line can be driven by each output
of the MPC9351 clock driver. For the series terminated case
however there is no DC current draw, thus the outputs can
drive multiple series terminated lines. Figure 7 “Single versus
Dual Transmission Lines” illustrates an output driving a single
series terminated line versus two series terminated lines in
parallel. When taken to its extreme the fanout of the MPC9351
clock driver is effectively doubled due to its capability to drive
multiple lines.
Figure 7. Single versus Dual Transmission Lines
14
IN
MPC9351
OUTPUT
BUFFER
RS = 36
ZO = 50
OutA
14
IN
MPC9351
OUTPUT
BUFFER
RS = 36
ZO = 50
OutB0
RS = 36
ZO = 50
OutB1
The waveform plots in Figure 8 “Single versus Dual Line
Termination Waveforms” show the simulation results of an out-
put driving a single line versus two lines. In both cases the
drive capability of the MPC9351 output buffer is more than suf-
ficient to drive 50
transmission lines on the incident edge.
Note from the delay measurements in the simulations a delta
of only 43ps exists between the two differently loaded outputs.
This suggests that the dual line driving need not be used exclu-
sively to maintain the tight output-to-output skew of the
MPC9351. The output waveform in Figure 8 “Single versus
Dual Line Termination Waveforms” shows a step in the wave-
form, this step is caused by the impedance mismatch seen
looking into the driver. The parallel combination of the 36
se-
ries resistor plus the output impedance does not match the
parallel combination of the line impedances. The voltage wave
launched down the two lines will equal:
VL = VS ( Z0 ÷ (RS+R0 +Z0))
Z0 = 50 || 50
RS = 36 || 36
R0 = 14
VL = 3.0 ( 25 ÷ (18+17+25)
= 1.31V
At the load end the voltage will double, due to the near unity
reflection coefficient, to 2.6V. It will then increment towards the
quiescent 3.0V in steps separated by one round trip delay (in
this case 4.0ns).
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MPC9352 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:3.3V / 2.5V 1:11 LVCMOS ZERO DELAY CLOCK GENERATOR |
| MPC9352AC | 功能描述:鎖相環(huán) - PLL 3.3V 240MHz Clock Generator RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
| MPC9352ACR2 | 功能描述:時鐘發(fā)生器及支持產(chǎn)品 FSL 1-11 LVCMOS PLL Clock Generator RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
| MPC9352FA | 功能描述:鎖相環(huán) - PLL 2.5 3.3V 200MHz Clock Generator RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
| MPC9352FAR2 | 制造商:Integrated Device Technology Inc 功能描述:Zero Delay PLL Clock Generator Single 32-Pin LQFP T/R 制造商:Integrated Device Technology Inc 功能描述:ZERO DLY PLL CLOCK GEN SGL 32LQFP - Tape and Reel |
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