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參數(shù)資料
| 型號： | ICS841S012DKILFT |
| 廠商： | IDT, Integrated Device Technology Inc |
| 文件頁數(shù)： | 3/23頁 |
| 文件大小： | 0K |
| 描述： | IC FREQ SYNTHESIZER 56VFQFN |
| 標準包裝： | 1,000 |
| 系列： | HiPerClockS™, PCI Express® (PCIe) |
| 類型： | 時鐘/頻率合成器，多路復用器 |
| PLL： | 是 |
| 主要目的： | PCI Express（PCIe） |
| 輸入： | LVCMOS，LVTTL，晶體 |
| 輸出： | HCSL，LVCMOS，LVTTL |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 2:12 |
| 差分 - 輸入:輸出： | 是/無 |
| 頻率 - 最大： | 250MHz |
| 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： | 56-VFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 56-VFQFP-EP（8x8） |
| 包裝： | 帶卷 (TR) |
ICS841S012BKI REVISION A NOVEMBER 10, 2009
11
2009 Integrated Device Technology, Inc.
ICS841S012I Data Sheet
CRYSTAL-TO-0.7V DIFFERENTIAL HCSL/LVCMOS FREQUENCY SYNTHESIZER
FIGURE 3. GENERAL DIAGRAM FOR LVCMOS DRIVER TO XTAL INPUT INTERFACE
LVCMOS TO XTAL INTERFACE
The XTAL_IN input can accept a single-ended LVCMOS signal
through an AC coupling 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 signals, 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 removing R1 and making R2 50
Ω. By overdriving
the crystal oscillator, the device will be functional, but note the
device performance is guaranteed by using a quartz crystal.
R2
Zo = 50
VDD
Ro
Zo = Ro + Rs
R1
VDD
XTAL_IN
XTAL_OUT
.1uf
Rs
CRYSTAL INPUT INTERFACE
The ICS841S012I has been characterized with 18pF parallel
resonant crystals. The capacitor values shown in
Figure 2 below
were determined using a 25MHz, 18pF parallel resonant crystal
FIGURE 2. CRYSTAL INPUT INTERFACE
and were chosen to minimize the ppm error. NOTE: External tun-
ing capacitors must be used for proper operations.
XTAL_IN
XTAL_OUT
X1
18pF Parallel Crystal
C1
15p
C2
22p
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICS841S012I | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:Crystal-to-0.7V Differential HCSL/LVCMOS Frequency Synthesizer |
| ICS841S01BG | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:PCI EXPRESS⑩ CLOCK GENERATOR |
| ICS841S01BGLF | 功能描述:IC CLK GENERATOR PLL 16-TSSOP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 專用 系列:HiPerClockS™, PCI Express® (PCIe) 標準包裝:1 系列:- 類型:時鐘/頻率發(fā)生器，多路復用器 PLL:是 主要目的:存儲器，RDRAM 輸入:晶體 輸出:LVCMOS 電路數(shù):1 比率 - 輸入:輸出:1:2 差分 - 輸入:輸出:無/是 頻率 - 最大:400MHz 電源電壓:3 V ~ 3.6 V 工作溫度:0°C ~ 85°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:Digi-Reel® 其它名稱:296-6719-6 |
| ICS841S01BGLFT | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:PCI EXPRESS⑩ CLOCK GENERATOR |
| ICS841S01BGT | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:PCI EXPRESS⑩ CLOCK GENERATOR |
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