MPC9351D FREESCALE [Freescale Semiconductor, Inc], MPC9351D Datasheet - Page 9

• Manufacturer Part Number: MPC9351D
• Description: Low Voltage PLL Clock Driver
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

cause any false clock triggering, however designers may be
uncomfortable with unwanted reflections on the line. To better
TIMING SOLUTIONS
Since this step is well above the threshold region it will not
3.0
2.5
2.0
1.5
1.0
0.5
0
Figure 8. Single versus Dual Waveforms
t D = 3.8956
2
In
OutA
4
Pulse Generator
Differential
Figure 10. TCLK MPC9351 AC test reference for V cc = 3.3V and V cc = 2.5V
Z = 50
Generator
Z = 50
Pulse
6
W
TIME (nS)
t D = 3.9386
W
OutB
8
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 11. PCLK MPC9351 AC test reference
10
Z O = 50
V TT
Z O = 50
R T = 50
12
R T = 50
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14
V TT
MPC9351 DUT
MPC9351 DUT
9
match the impedances when driving multiple lines the
situation in Figure 9. “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 9. Optimized Dual Line Termination
MPC9351
OUTPUT
BUFFER
14
Z O = 50
14 + 22
Z O = 50
R T = 50
R S = 22
R S = 22
25 = 25
R T = 50
k
22 = 50
V TT
V TT
Z O = 50
Z O = 50
k
50
MPC9351
MOTOROLA