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參數(shù)資料
| 型號： | ICS8745BMI-21LF |
| 元件分類： | 時鐘及定時 |
| 英文描述： | PLL BASED CLOCK DRIVER, 1 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO20 |
| 封裝： | 7.50 X 12.80 MM, 2.30 MM HEIGHT, MO-119, SOIC-20 |
| 文件頁數(shù)： | 15/15頁 |
| 文件大?。?/td> | 207K |
| 代理商： | ICS8745BMI-21LF |
8745BMI-21
www.icst.com/products/hiperclocks.html
REV. B MARCH 17, 2004
9
Integrated
Circuit
Systems, Inc.
ICS8745BI-21
1:1 DIFFERENTIAL-TO-LVDS
ZERO DELAY CLOCK GENERATOR
FIGURE 4C. HIPERCLOCKS CLK/NCLK INPUT DRIVEN BY
3.3V LVPECL DRIVER
FIGURE 4B. HIPERCLOCKS CLK/NCLK INPUT DRIVEN BY
3.3V LVPECL DRIVER
FIGURE 4D. HIPERCLOCKS CLK/NCLK INPUT DRIVEN BY
3.3V LVDS DRIVER
3.3V
R1
50
R3
50
Zo = 50 Ohm
LVPECL
Zo = 50 Ohm
HiPerClockS
CLK
nCLK
3.3V
Input
R2
50
Zo = 50 Ohm
Input
HiPerClockS
CLK
nCLK
3.3V
R3
125
R2
84
Zo = 50 Ohm
3.3V
R4
125
LVPECL
R1
84
3.3V
DIFFERENTIAL CLOCK INPUT INTERFACE
The CLK /nCLK accepts LVDS, LVPECL, LVHSTL, SSTL, HCSL
and other differential signals. Both V
SWING and VOH must meet the
V
PP and VCMR input requirements. Figures 4A to 4D show inter-
face examples for the HiPerClockS CLK/nCLK input driven by
the most common driver types. The input interfaces suggested
FIGURE 4A. HIPERCLOCKS CLK/NCLK INPUT DRIVEN BY
ICS HIPERCLOCKS LVHSTL DRIVER
here are examples only. Please consult with the vendor of the
driver component to confirm the driver termination requirements.
For example in
Figure 4A, the input termination applies for ICS
HiPerClockS LVHSTL drivers. If you are using an LVHSTL driver
from another vendor, use their termination recommendation.
1.8V
R2
50
Input
LVHSTL Driver
ICS
HiPerClockS
R1
50
LVHSTL
3.3V
Zo = 50 Ohm
HiPerClockS
CLK
nCLK
Zo = 50 Ohm
R1
100
3.3V
LVDS_Driv er
Zo = 50 Ohm
Receiv er
CLK
nCLK
3.3V
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS8745BI-21 provides
separate power supplies to isolate any high switching
noise from the outputs to the internal PLL. V
DD, VDDA, and VDDO
should be individually connected to the power supply
plane through vias, and bypass capacitors should be
used for each pin. To achieve optimum jitter performance,
power supply isolation is required.
Figure 3 illustrates how
a 10
resistor along with a 10F and a .01F bypass
capacitor should be connected to each V
DDA pin.
POWER SUPPLY FILTERING TECHNIQUES
FIGURE 3. POWER SUPPLY FILTERING
10
V
DDA
10
F
.01
F
3.3V
.01
F
V
DD
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| ICS8745BYI | 制造商:Integrated Device Technology Inc 功能描述: |
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