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參數(shù)資料
| 型號： | MPC953FA |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時(shí)鐘及定時(shí) |
| 英文描述： | 953 SERIES, PLL BASED CLOCK DRIVER, 8 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP32 |
| 封裝： | 7 X 7 MM, LQFP-32 |
| 文件頁數(shù)： | 5/7頁 |
| 文件大?。?/td> | 427K |
| 代理商： | MPC953FA |
MPC953
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 = 36
|| 36
Ro = 14
VL = 3.0 (25 / (18 + 14 + 25) = 3.0 (25 / 57)
= 1.31V
At the load end the voltage will double, due to the near
unity reflection coefficient, to 2.62V. 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)
VOL
TAGE
(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
14
MPC953
OUTPUT
BUFFER
RS = 22
ZO = 50
RS = 22
ZO = 50
14
+ 22 k 22 = 50 k 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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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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MPC953
Low Voltage PLL Clock Driver
NETCOM
IDT Low Voltage PLL Clock Driver
Freescale Timing Solutions Organization has been acquired by Integrated Device Technology, Inc
MPC953
5
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