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MPC93R51 Datasheet(PDF) 8 Page - Motorola, Inc

Part No. MPC93R51
Description  LOW VOLTAGE PLL CLOCK DRIVER
Download  12 Pages
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Maker  MOTOROLA [Motorola, Inc]
Homepage  http://www.freescale.com
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MPC93R51 Datasheet(HTML) 8 Page - Motorola, Inc

 
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MPC93R51
MOTOROLA
TIMING SOLUTIONS
8
Figure 7. Single versus Dual Waveforms
TIME (nS)
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 8.
“Optimized Dual Line Termination”
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 8. Optimized Dual Line Termination
14
MPC93R51
OUTPUT
BUFFER
RS = 22Ω
ZO = 50Ω
RS = 22Ω
ZO = 50Ω
14
Ω + 22Ω k 22Ω = 50Ω k 50Ω
25
Ω = 25Ω
Figure 9. TCLK MPC93R51 AC test reference for Vcc = 3.3V
Figure 10. PCLK MPC93R51 AC test reference
Pulse
Generator
Z = 50
W
RT = 50Ω
ZO = 50Ω
RT = 50Ω
ZO = 50Ω
MPC93R51 DUT
VTT
VTT
Differential
Pulse Generator
Z = 50
W
RT = 50Ω
ZO = 50Ω
RT = 50Ω
ZO = 50Ω
MPC93R51 DUT
VTT
VTT
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com


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