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参数资料
| 型号： | MPC954DT |
| 厂商： | MOTOROLA INC |
| 元件分类： | 时钟及定时 |
| 英文描述： | MPC900 SERIES, PLL BASED CLOCK DRIVER, 10 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO24 |
| 封装： | TSSOP-24 |
| 文件页数： | 5/5页 |
| 文件大小： | 117K |
| 代理商： | MPC954DT |
5
MPC954
MOTOROLA ADVANCED CLOCK DRIVERS DEVICE DATA
461
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)
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
7
MPC954
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 engi-
neers 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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