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參數(shù)資料
| 型號： | MPC954 |
| 廠商： | Motorola, Inc. |
| 英文描述： | Low Voltage PLL Clock Driver(低壓PLL時鐘驅(qū)動器) |
| 中文描述： | 低電壓PLL時鐘驅(qū)動器（低壓鎖相環(huán)時鐘驅(qū)動器） |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 96K |
| 代理商： | MPC954 |
MPC954
ECLinPS and ECLinPS Lite
DL140 — Rev 3
5
MOTOROLA
by the impedance mismatch seen looking into the driver. The
parallel combination of the 43
series 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 ( Zo / (Rs + Ro +Zo))
Zo = 50
|| 50
Rs = 43
|| 43
Ro = 7
VL = 3.0 (25 / (21.5 + 7 + 25) = 3.0 (25 / 53.5)
= 1.40V
At the load end the voltage will double, due to the near
unity reflection coefficient, to 2.80V. It will then increment
towards the quiescent 3.0V in steps separated by one round
trip delay (in this case 4.0ns).
Figure 5. Single versus Dual Waveforms
TIME (nS)
V
3.0
2.5
2.0
1.5
1.0
0.5
0
2
4
6
8
10
12
14
OutB
tD = 3.9386
OutA
tD = 3.8956
In
Since this step is well above the threshold region it will not
cause any false clock triggering, however designers may be
uncomfortable with unwanted reflections on the line. To
better match the impedances when driving multiple lines the
situation in Figure 6 should be used. In this case the series
terminating resistors are reduced such that when the parallel
combination is added to the output buffer impedance the line
impedance is perfectly matched.
Figure 6. Optimized Dual Line Termination
7
MPC954
OUTPUT
BUFFER
RS = 22
ZO = 50
RS = 22
ZO = 50
14
+ 22
22
= 50
50
25
= 25
SPICE level output buffer models are available for
engineers who want to simulate their specific interconnect
schemes. In addition IV characteristics are in the process of
being generated to support the other board level simulators in
general use.
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| MPC958 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:LOW VOLTAGE PLL CLOCK DRIVER |
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| MPC9600AER2 | 功能描述:時鐘緩沖器 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:5 最大輸入頻率:40 MHz 傳播延遲（最大值）: 電源電壓-最大:3.45 V 電源電壓-最小:2.375 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LLP-24 封裝:Reel |
| MPC9600FA | 功能描述:IC CLOCK DRVR PLL LV 1:21 48LQFP RoHS:否 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:- 標(biāo)準(zhǔn)包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時鐘 輸出:時鐘 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
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