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參數(shù)資料
| 型號： | ICS840021AGT |
| 英文描述： | FEMTOCLOCKS? CRYSTAL-TO-LVCMOS/ LVTTL CLOCK GENERATOR |
| 中文描述： | FEMTOCLOCKS？水晶到的LVCMOS / LVTTL時鐘發(fā)生器 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大小： | 202K |
| 代理商： | ICS840021AGT |
840021AG
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 30, 2004
7
Integrated
Circuit
Systems, Inc.
ICS840021
F
EMTO
C
LOCKS
C
RYSTAL
-
TO
-
LVCMOS/LVTTL C
LOCK
G
ENERATOR
A
PPLICATION
S
CHEMATIC
Figure 3Ashows a schematic example of the ICS840021. An
example of LVCMOS termination is shown in this schematic.
Additional LVCMOS termination approaches are shown in the
LVCMOS Termination Application Note. In this example, an 18pF
parallel resonant 25MHz crystal is used for generating 125MHz
output frequency. The C1 = 27pF and C2 = 33pF are recom-
mended for frequency accuracy. For different board layout, the
C1 and C2 values may be slightly adjusted for optimizing fre-
quency accuracy.
F
IGURE
3A. ICS840021 S
CHEMATIC
E
XAMPLE
F
IGURE
3B. ICS840021 PC B
OARD
L
AYOUT
E
XAMPLE
PC B
OARD
L
AYOUT
E
XAMPLE
Figure 3B shows an example of ICS840021 P.C. board layout.
The crystal X1 footprint shown in this example allows installa-
tion of either surface mount HC49S or through-hole HC49 pack-
age. The footprints of other components in this example are listed
in the Table 7. There should be at least one decoupling capacitor
per power pin. The decoupling capacitors should be located as
close as possible to the power pins. The layout assumes that
the board has clean analog power ground plane.
T
ABLE
7. F
OOTPRINT
T
ABLE
e
c
n
e
r
e
R
2
C
,
C
3
C
5
C
,
C
3
R
,
R
e
a
T
:
E
T
O
N
n
n
w
o
h
s
s
e
z
e
2
5
3
3
e
n
x
e
z
S
4
0
8
0
6
0
6
0
o
p
m
t
o
y
a
0
0
0
0
t
m
a
o
c
s
s
.
LVCMOS
VDD
C2
33pF
Q
C4
0.1u
U1
ICS840021
1
2
3
4
8
7
6
5
VDDA
OE
XTAL_OUT
XTAL_IN
VDD
Q0
GND
NC
VDD
C3
10uF
R2
10
X1
R3
43
C5
0.1u
OE
C1
27pF
Zo = 50 Ohm
VDDA
VDD=3.3V
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| ICS840022 | FEMTOCLOCKS⑩CRYSTAL-TO LVCMOS/LVTTL CLOCK GENERATOR |
| ICS840022AG | FEMTOCLOCKS⑩CRYSTAL-TO LVCMOS/LVTTL CLOCK GENERATOR |
| ICS840022AGT | FEMTOCLOCKS⑩CRYSTAL-TO LVCMOS/LVTTL CLOCK GENERATOR |
| ICS840024AGI | FEMTOCLOCKS⑩ CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICS840021I | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER |
| ICS840022 | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS⑩CRYSTAL-TO LVCMOS/LVTTL CLOCK GENERATOR |
| ICS840022AG | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS⑩CRYSTAL-TO LVCMOS/LVTTL CLOCK GENERATOR |
| ICS840022AGLF | 功能描述:IC CLK GEN GIGABIT ETH 8-TSSOP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:HiPerClockS™, FemtoClock™ 標(biāo)準(zhǔn)包裝:1,000 系列:- 類型:時鐘/頻率合成器，扇出分配 PLL:- 輸入:- 輸出:- 電路數(shù):- 比率 - 輸入:輸出:- 差分 - 輸入:輸出:- 頻率 - 最大:- 除法器/乘法器:- 電源電壓:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:56-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-VFQFP-EP（8x8） 包裝:帶卷 (TR) 其它名稱:844S012AKI-01LFT |
| ICS840022AGLFT | 功能描述:IC CLOCK GENERATOR 16-TSSOP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:HiPerClockS™, FemtoClock™ 標(biāo)準(zhǔn)包裝:1,000 系列:- 類型:時鐘/頻率合成器，扇出分配 PLL:- 輸入:- 輸出:- 電路數(shù):- 比率 - 輸入:輸出:- 差分 - 輸入:輸出:- 頻率 - 最大:- 除法器/乘法器:- 電源電壓:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:56-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-VFQFP-EP（8x8） 包裝:帶卷 (TR) 其它名稱:844S012AKI-01LFT |
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