IDT / ICS HCSL CLOCK GENERATOR 9 I" />
參數(shù)資料
型號: ICS841608AKILF
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 17/17頁
文件大小: 0K
描述: IC CLOCK GENERATOR 32VFQFPN
產(chǎn)品培訓模塊: PCI-Express
標準包裝: 490
系列: HiPerClockS™, FemtoClock™
類型: 時鐘發(fā)生器,扇出配送,多路復用器
PLL: 帶旁路
輸入: LVCMOS,LVTTL,晶體
輸出: HCSL
電路數(shù): 1
比率 - 輸入:輸出: 2:8
差分 - 輸入:輸出: 無/是
頻率 - 最大: 125MHz
除法器/乘法器: 是/無
電源電壓: 3.135 V ~ 3.465 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 32-VFQFN 裸露焊盤
供應商設(shè)備封裝: 32-VFQFPN 裸露焊盤(4x4)
包裝: 托盤
其它名稱: 841608AKILF
ICS841608AKILF-ND
IDT / ICS HCSL CLOCK GENERATOR
9
ICS841608AKI REV. A JUNE 18, 2008
ICS841608I
FEMTOCLOCKS CRYSTAL-TO-HCSL CLOCK GENERATOR
LVCMOS TO XTAL INTERFACE
The XTAL_IN input can accept a single-ended LVCMOS
signal through an AC couple capacitor. A general interface
diagram is shown in
Figure 3. The XTAL_OUT pin can be left
floating. The input edge rate can be as slow as 10ns. For
LVCMOS inputs, it is recommended that the amplitude be
reduced from full swing to half swing in order to prevent signal
interference with the power rail and to reduce noise. This
configuration requires that the output impedance of the driver
(Ro) plus the series resistance (Rs) equals the transmission
line impedance. In addition, matched termination at the crystal
input will attenuate the signal in half. This can be done in one of
two ways. First, R1 and R2 in parallel should equal the
transmission line impedance. For most 50
Ω applications, R1
and R2 can be 100
Ω. This can also be accomplished by remov-
ing R1 and making R2 50
Ω.
FIGURE 3. GENERAL DIAGRAM FOR LVCMOS DRIVER TO XTAL INPUT INTERFACE
XTAL_IN
XTAL_OUT
VCC
R2
Ro
R1
Zo = 50
Rs
VCC
.1uf
VDD
Zo = Ro + Rs
CRYSTAL INPUT INTERFACE
The ICS841608I has been characterized with 18pF parallel
resonant crystals. The capacitor values shown in
Figure 4 below
FIGURE 4. CRYSTAL INPUt INTERFACE
were determined using a 25MHz, 18pF parallel resonant crystal
and were chosen to minimize the ppm error.
C1
27p
X1
18pF Parallel Crystal
C2
27p
XTAL_OUT
XTAL_IN
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ICS841608AKILFT 功能描述:IC CLOCK GENERATOR 32-VFQFPN 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™ 標準包裝: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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ICS841608I 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:FEMTOCLOCKS CRYSTAL-TO-HCSL CLOCK GENERATOR VCO: 500MHz
ICS841654AGI 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:FEMTOCLOCKS? CRYSTAL-TO-HCSL CLOCK GENERATOR
ICS841654AGILF 功能描述:IC CLOCK GENERATOR 28-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™ 標準包裝: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 供應商設(shè)備封裝:56-VFQFP-EP(8x8) 包裝:帶卷 (TR) 其它名稱:844S012AKI-01LFT