参数资料
型号: MPC932FA
厂商: INTEGRATED DEVICE TECHNOLOGY INC
元件分类: 时钟及定时
英文描述: 932 SERIES, PLL BASED CLOCK DRIVER, 6 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP32
封装: TQFP-32
文件页数: 6/8页
文件大小: 406K
代理商: MPC932FA
MPC932
MOTOROLA
TIMING SOLUTIONS
BR1333 — REV 5
6
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 2.8V. 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
MPC932
OUTPUT
BUFFER
RS = 36
ZO = 50
RS = 36
ZO = 50
7
+ 36 k 36 = 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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MPC932
Low Voltage PLL Clock Driver
NETCOM
IDT Low Voltage PLL Clock Driver
Freescale Timing Solutions Organization has been acquired by Integrated Device Technology, Inc
MPC932
6
相关PDF资料
PDF描述
MPC932PFA PLL BASED CLOCK DRIVER, 6 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP32
MPC9331FA PLL BASED CLOCK DRIVER, 6 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP32
MPC9331FAR2 PLL BASED CLOCK DRIVER, 6 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP32
MPC9351FAR2 9351 SERIES, PLL BASED CLOCK DRIVER, 9 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP32
MPC9352AC 9352 SERIES, PLL BASED CLOCK DRIVER, 11 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP32
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