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参数资料
| 型号： | MPC9443FAR2 |
| 厂商： | MOTOROLA INC |
| 元件分类： | 时钟及定时 |
| 英文描述： | LOW SKEW CLOCK DRIVER, 16 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP48 |
| 封装： | 7 X 7 MM, PLASTIC, LQFP-48 |
| 文件页数： | 16/16页 |
| 文件大小： | 205K |
| 代理商： | MPC9443FAR2 |
MPC9443
TIMING SOLUTIONS
9
MOTOROLA
Power Consumption of the MPC9443
and Thermal Management
The MPC9443 AC specification is guaranteed for the entire
operating frequency range up to 350 MHz. The MPC9443
power consumption and the associated long-term reliability
may decrease the maximum frequency limit, depending on
operating conditions such as clock frequency, supply voltage,
output loading, ambient temperature, vertical convection and
thermal conductivity of package and board. This section
describes the impact of these parameters on the junction
temperature and gives a guideline to estimate the MPC9443 die
junction temperature and the associated device reliability. For a
complete analysis of power consumption as a function of
operating conditions and associated long term device reliability
please refer to the application note AN1545. According the
AN1545, the long-term device reliability is a function of the die
junction temperature:
Increased power consumption will increase the die junction
temperature and impact the device reliability (MTBF).
According to the system-defined tolerable MTBF, the die
junction temperature of the MPC9443 needs to be controlled
and the thermal impedance of the board/package should be
optimized. The power dissipated in the MPC9443 is
represented in equation 1.
Where ICCQ is the static current consumption of the
MPC9443, CPD is the power dissipation capacitance per output,
(Μ)ΣC
L represents the external capacitive output load, N is the
number of active outputs (N is always 16 in case of the
MPC9443). The MPC9443 supports driving transmission lines
to maintain high signal integrity and tight timing parameters.
Any transmission line will hide the lumped capacitive load at the
end of the board trace, therefore,
ΣC
L is zero for controlled
transmission line systems and can be eliminated from
equation 1. Using parallel termination output termination results
in equation 2 for power dissipation.
In equation 2, P stands for the number of outputs with a
parallel or thevenin termination, VOL, IOL, VOH and IOH are a
function of the output termination technique and DCQ is the
clock signal duty cycle. If transmission lines are used
ΣC
L is
zero in equation 2 and can be eliminated. In general, the use of
controlled transmission line techniques eliminates the impact of
the lumped capacitive loads at the end lines and greatly
reduces the power dissipation of the device. Equation 3
describes the die junction temperature TJ as a function of the
power consumption.
Where Rthja is the thermal impedance of the package
(junction to ambient) and TA is the ambient temperature.
According to Table 13, the junction temperature can be used to
estimate the long-term device reliability. Further, combining
equation 1 and equation 2 results in a maximum operating
frequency for the MPC9443 in a series terminated transmission
line system.
TJ,MAX should be selected according to the MTBF system
The Rthja represent data based on 1S2P boards, using 2S2P
boards will result in a lower thermal impedance than indicated
below.
If the calculated maximum frequency is below 250 MHz, it
becomes the upper clock speed limit for the given application
conditions. The following eight derating charts describe the safe
frequency operation range for the MPC9443. The charts were
calculated for a maximum tolerable die junction temperature of
110
°C (120°C), corresponding to an estimated MTBF of 9.1
years (4 years), a supply voltage of 3.3 V and series terminated
transmission line or capacitive loading. Depending on a given
set of these operating conditions and the available device
convection a decision on the maximum operating frequency
can be made.
Table 13. Die Junction Temperature and MTFBF
Junction Temperature (
°C)
MTBF (Years)
100
20.4
110
9.1
120
4.2
130
2.0
Table 14. Thermal Package Impedance of the 48 ld LQFP
Convection,
LFPM
Rthja (1P2S board),
K/W
Rthja (2P2S board),
K/W
Still air
69
53
100 lfpm
200 lfpm
64
50
300 lfpm
400 lfpm
500 lfpm
PTOT = [ ICCQ + VCC fCLOCK ( N CPD + Σ CL ) ] VCC
M
PTOT = VCC [ ICCQ + VCC fCLOCK ( N CPD + Σ CL ) ] + Σ [ DCQ IOH (VCC – VOH) + (1 – DCQ) IOL VOL ]
MP
TJ = TA + PTOT Rthja
fCLOCK,MAX =
CPD N V
2
CC
1
[
– (ICCQ VCC)
]
Rthja
Tj,MAX – TA
Equation 1
Equation 2
Equation 3
Equation 4
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MPC9446 | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:2.5V and 3.3V LVCMOS Clock Fanout Buffer |
| MPC9446AC | 功能描述:时钟缓冲器 2.5 3.3V 275MHz Clock Generator RoHS:否 制造商:Texas Instruments 输出端数量:5 最大输入频率:40 MHz 传播延迟（最大值）: 电源电压-最大:3.45 V 电源电压-最小:2.375 V 最大功率耗散: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LLP-24 封装:Reel |
| MPC9446ACR2 | 功能描述:时钟驱动器及分配 FSL 1-10 LVCMOS Fanout Buffer RoHS:否 制造商:Micrel 乘法/除法因子:1:4 输出类型:Differential 最大输出频率:4.2 GHz 电源电压-最大: 电源电压-最小:5 V 最大工作温度:+ 85 C 封装 / 箱体:SOIC-8 封装:Reel |
| MPC9446FA | 功能描述:时钟缓冲器 2.5 3.3V 250MHz Clock Generator RoHS:否 制造商:Texas Instruments 输出端数量:5 最大输入频率:40 MHz 传播延迟（最大值）: 电源电压-最大:3.45 V 电源电压-最小:2.375 V 最大功率耗散: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LLP-24 封装:Reel |
| MPC9446FAR2 | 功能描述:时钟驱动器及分配 FSL 1-10 LVCMOS Fanout Buffer RoHS:否 制造商:Micrel 乘法/除法因子:1:4 输出类型:Differential 最大输出频率:4.2 GHz 电源电压-最大: 电源电压-最小:5 V 最大工作温度:+ 85 C 封装 / 箱体:SOIC-8 封装:Reel |
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