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PI6C2520A

更新时间: 2024-11-22 23:27:39
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页数 文件大小 规格书
8页 105K
描述
Twenty Distributed-Output Clock Driver

PI6C2520A 数据手册

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PI6C2520  
Low-Noise Phase-Locked Loop  
Clock Driver with 20 Clock Outputs  
Product Features  
Product Description  
• Low-Noise Phase-Locked Loop Clock Distribution.  
The PI6C2520 is a low-skew, low-jitter, phase-locked loop (PLL)  
clock driver, distributing low-noise clock signals for Networking  
Applications. By connecting the feedback FB_OUT output to the  
feedback FB_IN input, the propagation delay from the CLK_IN  
input to any clock output will be nearly zero. This zero-delay  
feature allows the CLK_IN input clock to be distributed, providing  
5 banks of 4 clocks and an extra clock for feedback.  
• Allows Clock Input to have Spread Spectrum modulation  
for EMI reduction. The clock outputs track the Clock Input  
modulation.  
• Maximumclockfrequencyof125MHz.  
• Zero Input-to-Output delay.  
• Low jitter: Cycle-to-Cycle jitter ±100ps max.  
For test purposes, the PLL can be bypassed by strapping AV to  
ground. The PI6C2520, which allows a Spread Spectrum clock in-  
CC  
• On-chip series damping resistor at clock output drivers for  
low noise and EMI reduction.  
put, operates at 3.3V V and provides integrated series-damping  
CC  
• Operates at 3.3V VCC  
.
resistors that make it ideal for driving point-to-point loads. Output  
signal duty cycles are adjusted to 50 percent, independent of the  
duty cycle at the input clock.  
• Output-to-Output skew less than 200ps.  
• Package: Plastic 56-pin TSSOP (A).  
Each bank of outputs can be enabled or disabled via the 1G, 2G,  
3G, 4G, and 5G control inputs. When the G inputs are high, the  
outputs switch in phase and frequency with CLK_IN. When the G  
inputs are low, the outputs are disabled to the logic low state.  
Product Pin Configuration  
Block Diagram  
1
V
V
56  
55  
54  
53  
52  
51  
50  
49  
48  
47  
46  
45  
44  
43  
42  
41  
40  
39  
38  
37  
36  
35  
34  
33  
32  
31  
30  
29  
CC  
1G  
CC  
Y
4
2
Y
4 0  
Y
4 1  
GND  
GND  
1 0  
1Y [0:3]  
3
Y
1 1  
GND  
GND  
2G  
4
4
2Y [0:3]  
5
3G  
4
6
Y
4 2  
Y
4 3  
V
Y
1 2  
3Y [0:3]  
7
Y
1 3  
V
4G  
4
8
CC  
4Y [0:3]  
CC  
1G  
9
4G  
5G  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
GND  
AV  
GND  
AV  
CC  
CC  
FB_IN  
AGND  
FB_OUT  
GND  
4
CLK  
CLK  
5Y [0:3]  
56-Pin  
A
AGND  
5G  
PLL  
FB_IN  
FB_OUT  
GND  
2G  
AV  
3G  
CC  
V
V
CC  
CC  
Y
Y
3 0  
Y
3 1  
GND  
GND  
2 0  
Y
2 1  
GND  
GND  
Y
3 2  
Y
3 3  
V
Y
2 2  
Y
2 3  
V
CC  
CC  
V
V
CC  
CC  
Y
Y
5 3  
Y
5 2  
GND  
5 0  
Y
5 1  
GND  
PS8435A  
07/06/00  
1

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