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參數(shù)資料
| 型號(hào)： | MC88PL117 |
| 廠商： | Motorola, Inc. |
| 英文描述： | CMOS PLL CLOCK DRIVER |
| 中文描述： | 的CMOS PLL時(shí)鐘驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 7/11頁(yè) |
| 文件大小： | 139K |
| 代理商： | MC88PL117 |
MC88PL117
TIMING SOLUTIONS
BR1333 — Rev 6
7
MOTOROLA
TABLE 1. PROGRAMMABLE OUTPUT CONFIGURATIONS
(Q is system reference frequency)
Output Configuration Number
OPT2
OPT1
OPT0
No of 2X_Q
Outputs
No of Q
Outputs
No of Q/2
Outputs
1
L
L
L
2
12
0
2
L
L
H
2
4
8
3
L
H
L
4
10
0
4
L
H
H
0
14
0
5
H
L
L
0
7
7
6
H
H
H
2
12
0
TABLE 2. PROGRAMMABLE INPUT FREQUENCY MODES
(Multiplication factors)
Input Frequency Mode
MULT1
MULT0
Input Frequency
1
L
L
Q/4
2
L
H
Q/2
3
H
H
Q
TABLE 3. Q
PROGRAMMABLE PHASE INCREMENTS FOR Q AND Q/2 OUTPUTS
2
1
0
Q
Phase
to Q Outputs1
Q
/2 Phase
to Q Outputs2
2
1
0
Q
Phase
to Q Outputs1
Q
/2 Phase
to Q Outputs2
L
L
L
180
°
45
°
H
L
L
180
°
225
°
L
L
H
90
°
90
°
H
L
H
90
°
270
°
L
H
L
0
°
135
°
H
H
L
0
°
315
°
L
H
H
270
°
180
°
H
H
H
270
°
360
°
1. Valid for output configurations 1, 3, 4, 6, 8
2. Valid for output configurations 2, 5, 7
Applications Information
Introduction
The 88PL117 provides the necessary clock frequencies
for the PowerPC 601 and Pentium Microprocessors. With
output frequency capabilities up to 120MHz and the ability to
also generate half and quarter frequency clocks the 88PL117
simplifies the system implementation of a PowerPC 601 or
Pentium Microprocessor. This section will overview the clock
requirements of the PowerPC 601 and Pentium
Microprocessors and apply those to the specification limits of
the 88PL117 to demonstrate compatibility. Although not
exhaustive the intent is to provide a basic set of guidelines on
system implementation. For more cost sensitive applications
which require fewer clocks the designer should refer to the
MC88915TFN133 data sheet for an alternative clock driver
suitable for PowerPC 601 or Pentium Microprocessor based
designs.
Figures 7 and 8 illustrate two common output config–
urations of the 88PL117 which will facilitate POWERPC 601
(MPC601) system designs. Figure 7 would prove beneficial
for high frequency processor designs where the bus clock
would likely run at one fourth the 2X_PCLK input. In this
configuration a 2X_Q output of the 88PL117 can drive the
2X_PCLK of the PowerPC 601 processor while a Q and Q/2
output can drive the PCLK_EN and BCLK_EN inputs
respectively. For designs where the system bus will run at
half the frequency of the 2X_PCLK (same frequency as the
internal processor clock) a larger number of Q outputs would
be required. Figure 8 could be used in this situation with a
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