參數(shù)資料
型號(hào): ICS8745AMI-21LFT
元件分類: 時(shí)鐘及定時(shí)
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, SOIC-20
文件頁(yè)數(shù): 13/13頁(yè)
文件大?。?/td> 154K
代理商: ICS8745AMI-21LFT
8745AMI-21
www.icst.com/products/hiperclocks.html
REV. A JANUARY 31, 2003
9
Integrated
Circuit
Systems, Inc.
ICS8745I-21
DIFFERENTIAL-TO-LVDS
ZERO DELAY CLOCK GENERATOR
FIGURE 2A. ICS8745I-21 LVDS ZERO DELAY BUFFER SCHEMATIC EXAMPLE
LAYOUT GUIDELINE
The schematic of the ICS8745I-21 layout example is shown
in
Figure 2A. The ICS8745I-21 recommended PCB board lay-
out for this example is shown in
Figure 2B. This layout ex-
ample is used as a general guideline. The layout in the actual
system will depend on the selected component types, the
density of the components, the density of the traces, and the
stack up of the P.C. board.
VDDO
SEL0
PLL_SEL
C11
0.01u
RD7
1K
VDD
SEL0
R7
10
R8
50
VDDO
LVDS_input
+
-
RD6
SP
R10
50
Zo = 50 Ohm
SEL1
C16
10u
Zo = 50 Ohm
SEL[3:0] = 0101,
Divide by 2
PLL_SEL
C4
0.1uF
SEL2
U4
8745-21
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
20
19
18
17
CLK
nCLK
MR
nFB_IN
FB_IN
SEL2
VDDO
nQFB
QFB
GND
VDDO
nQ
Q
GND
SEL3
VDDA
SEL1
SEL0
VDDI
PLL_SEL
SP = Space (i.e. not intstalled)
(155.52 MHz)
3.3V
VDDO=3.3V
RD3
SP
Bypass capacitors located
near the power pins
Zo = 50 Ohm
RD4
SP
RU6
1K
RU7
SP
3.3V PECL Driver
VDDA
RU4
1K
R9
50
SEL3
R2
100
VDDO
RU3
1K
C2
0.1uF
(U1-7)
Zo = 50 Ohm
C1
0.1uF
SEL2
VDD
(77.76 MHz)
RU5
SP
RD5
1K
SEL1
R4
100
(U1-11)
VDD
VDD=3.3V
SEL3
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