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參數(shù)資料
| 型號： | ICS650-44 |
| 英文描述： | Spread Spectrum Clock Synthesizer |
| 中文描述： | 擴(kuò)頻時鐘合成器 |
| 文件頁數(shù)： | 3/10頁 |
| 文件大?。?/td> | 119K |
| 代理商： | ICS650-44 |
Spread Spectrum Clock Synthesizer
MDS 650-44 C
3
Revision 080305
Integrated Circuit Systems, Inc.
●
525 Race Street, San Jose, CA 95126
●
tel (408) 297-1201
●
www.icst.com
P R E L I M I N A R Y I N F O R M AT I O N
ICS650-44
Pin Descriptions
External Components
Decoupling Capacitor
As with any high-performance mixed-signal IC, the
ICS650-44 must be isolated from system power supply
noise to perform optimally.
A decoupling capacitor of 0.01μF must be connected
between each VDD and the PCB ground plane.
Series Termination Resistor
Clock output traces over one inch should use series
termination. To series terminate a 50
trace (a
commonly used trace impedance), place a 33
resistor
in series with the clock line, as close to the clock output
pin as possible. The nominal impedance of the clock
output is 20
.
Crystal Load Capacitors
The device crystal connections should include pads for
small capacitors from X1 to ground and from X2 to
ground. These capacitors are used to adjust the stray
capacitance of the board to match the nominally
required crystal load capacitance. Because load
capacitance can only be increased in this trimming
process, it is important to keep stray capacitance to a
minimum by using very short PCB traces (and no vias)
between the crystal and device. Crystal capacitors
must be connected from each of the pins X1 and X2 to
ground.
The value (in pF) of these crystal caps should equal
(C
L
-6 pF)*2. In this equation, C
L
= crystal load
capacitance in pF. Example: For a crystal with a 16 pF
load capacitance, each crystal capacitor would be 20
pF [(16-6) x 2] = 20.
Pin
Number
1
Pin Name
Pin
Type
Input
Pin Description
X1/CLKIN
Crystal input. Connect this pin to a 25 MHz crystal or external input
clock.
Select pin 0. Internal pull-up resistor. See table on page 2.
Select pin 1. Internal pull-up resistor. See table on page 2.
Spread Spectrum output. Weak internal pull-down when tri-stated.
Connect to +3.3 V.
Connect to ground.
Select pin 3. Internal pull-up resistor. See table on page 2.
Spread Spectrum output. Weak internal pull-down when tri-stated.
Spread Spectrum output. Weak internal pull-down when tri-stated.
Connect to +2.5 V.
Connect to ground.
Connect to +3.3 V.
Select pin 2. Internal pull-up resistor. See table on page 2.
Powers down entire chip. Tri-states CLK outputs when low. Internal
pull-up.
Connect to +3.3 V.
Crystal Output. Connect this pin to a 25 MHz crystal. Do not connect if
clock input is used.
2
3
4
5
6
7
8
9
10
11
12
13
14
FS0
FS1
50M
VDD
GND
FS3
50M
50M
VDDO
GND
VDD
FS2
PDTS
Input
Input
Output
Power
Power
Input
Output
Output
Power
Power
Power
Input
Input
15
16
VDD
X2
Power
Output
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ICS650GI-44 | Spread Spectrum Clock Synthesizer |
| ICS650GI-44LF | Spread Spectrum Clock Synthesizer |
| ICS650GI-44LFT | Spread Spectrum Clock Synthesizer |
| ICS650GI-44T | Spread Spectrum Clock Synthesizer |
| ICS650GI-47LF | Spread Spectrum Clock Synthesizer |
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參數(shù)描述 |
|---|---|
| ICS650-47 | 制造商:ICS 制造商全稱:ICS 功能描述:Spread Spectrum Clock Synthesizer |
| ICS650G-36 | 功能描述:IC CLOCK NETWORK/PCI 16-TSSOP RoHS:否 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:- 產(chǎn)品變化通告:Product Discontinuation 04/May/2011 標(biāo)準(zhǔn)包裝:96 系列:- 類型:時鐘倍頻器，零延遲緩沖器 PLL:帶旁路 輸入:LVTTL 輸出:LVTTL 電路數(shù):1 比率 - 輸入:輸出:1:8 差分 - 輸入:輸出:無/無 頻率 - 最大:133.3MHz 除法器/乘法器:是/無 電源電壓:3 V ~ 3.6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:管件 其它名稱:23S08-5HPGG |
| ICS650G-36LF | 功能描述:IC CLOCK NETWORK/PCI 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:- 產(chǎn)品變化通告:Product Discontinuation 04/May/2011 標(biāo)準(zhǔn)包裝:96 系列:- 類型:時鐘倍頻器，零延遲緩沖器 PLL:帶旁路 輸入:LVTTL 輸出:LVTTL 電路數(shù):1 比率 - 輸入:輸出:1:8 差分 - 輸入:輸出:無/無 頻率 - 最大:133.3MHz 除法器/乘法器:是/無 電源電壓:3 V ~ 3.6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:管件 其它名稱:23S08-5HPGG |
| ICS650G-36LFT | 功能描述:IC CLOCK NETWORK/PCI 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:- 產(chǎn)品變化通告:Product Discontinuation 04/May/2011 標(biāo)準(zhǔn)包裝:96 系列:- 類型:時鐘倍頻器，零延遲緩沖器 PLL:帶旁路 輸入:LVTTL 輸出:LVTTL 電路數(shù):1 比率 - 輸入:輸出:1:8 差分 - 輸入:輸出:無/無 頻率 - 最大:133.3MHz 除法器/乘法器:是/無 電源電壓:3 V ~ 3.6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:管件 其它名稱:23S08-5HPGG |
| ICS650G-36T | 功能描述:IC CLOCK NETWORK/PCI 16-TSSOP RoHS:否 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:- 產(chǎn)品變化通告:Product Discontinuation 04/May/2011 標(biāo)準(zhǔn)包裝:96 系列:- 類型:時鐘倍頻器，零延遲緩沖器 PLL:帶旁路 輸入:LVTTL 輸出:LVTTL 電路數(shù):1 比率 - 輸入:輸出:1:8 差分 - 輸入:輸出:無/無 頻率 - 最大:133.3MHz 除法器/乘法器:是/無 電源電壓:3 V ~ 3.6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:管件 其它名稱:23S08-5HPGG |
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