參數(shù)資料
型號(hào)： ICS843021AGLFT
英文描述： FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V LVPECL CLOCK GENERATOR
中文描述： FEMTOCLOCKS -商標(biāo)晶體至3.3V的LVPECL時(shí)鐘發(fā)生器
文件頁(yè)數(shù)： 7/13頁(yè)
文件大小： 189K
代理商： ICS843021AGLFT
843021AG
www.icst.com/products/hiperclocks.html
REV. C MARCH 31, 2005
7
Integrated
Circuit
Systems, Inc.
ICS843021
F
EMTO
C
LOCKS
C
RYSTAL
-
TO
-
3.3V LVPECL C
LOCK
G
ENERATOR
A
PPLICATION
S
CHEMATIC
Figure 3Ashows a schematic example of the ICS843021. An
example of LVEPCL termination is shown in this schematic.
Additional LVPECL termination approaches are shown in the
LVPECL 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. ICS843021 S
CHEMATIC
E
XAMPLE
F
IGURE
3B. ICS843021 PC B
OARD
L
AYOUT
E
XAMPLE
PC B
OARD
L
AYOUT
E
XAMPLE
Figure 3B shows an example of ICS843021 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 6. 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
6. F
OOTPRINT
T
ABLE
e
c
n
e
r
e
R
2
C
,
C
3
C
5
C
,
C
2
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
.
Zo = 50 Ohm
VCC
X1
25MHz
VCC=3.3V
C3
10uF
VCC
C1
27pF
Q
C5
R3
133
C2
33pF
VCC
Zo = 50 Ohm
U1
ICS843021
1
2
3
4
8
7
6
5
VCCA
VEE
XTAL_OUT
XTAL_IN
VCC
Q0
nQ0
NC
R4
82.5
C4
R5
133
nQ
VCCA
R6
82.5
18pF
R2
10
+
-
相關(guān)PDF資料
PDF描述
ICS843021AGT FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V LVPECL CLOCK GENERATOR
ICS843022 FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V LVPECL CLOCK GENERATOR
ICS843022AG FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V LVPECL CLOCK GENERATOR
ICS843022AGT FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V LVPECL CLOCK GENERATOR
ICS843023AGI FEMTOCLOCKS-TM CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ICS843021AGT 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V LVPECL CLOCK GENERATOR
ICS843021I-01 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS-TM CRYSTAL-TO-3.3V, 2.5V 125MHZ LVPECL CLOCK GENERATOR
ICS843022 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V LVPECL CLOCK GENERATOR
ICS843022AG 制造商:INT_DEV_TECH 功能描述:
ICS843022AGI-48LF 功能描述:IC CLK SYNTHESIZER LVPECL 8TSSOP RoHS:是 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)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(shí)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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