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ICS844001AGI PDF预览

ICS844001AGI

更新时间: 2024-09-29 11:14:39
品牌 Logo 应用领域
矽成 - ICSI 时钟发生器
页数 文件大小 规格书
10页 162K
描述
FEMTOCLOCKS? CRYSTAL-TO- LVDS CLOCK GENERATOR

ICS844001AGI 数据手册

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PRELIMINARY  
ICS844001I  
Integrated  
Circuit  
Systems, Inc.  
FEMTOCLOCKS™ C RYSTAL-TO- LVDS  
CLOCK GENERATOR  
GENERAL DESCRIPTION  
FEATURES  
(1) Differential LVDS output  
The ICS844001I is a Fibre Channel Clock  
ICS  
Generator and a member of the HiPerClocksTM  
family of high performance devices from ICS.  
The ICS844001I uses an 18pF parallel resonant  
crystal over the range of 20.4MHz - 28.3MHz.  
HiPerClockS™  
Crystal oscillator interface, 18pF parallel resonant crystal  
(20.4MHz - 28.3MHz)  
Output frequency range: 81.66MHz - 226.66MHz  
VCO range: 490MHz - 680MHz  
For Fibre Channel applications, a 26.5625MHz crystal is used.  
The frequency select pin allows the device to generate  
either 106.25MHz or 212.5MHz from a 26.5625MHz  
crystal. To generate 187.5MHz for 12Gb Ethernet, a  
23.4375MHz crystal is used. The ICS844001I uses ICS’ 3rd  
generation low phase noise VCO technology and can  
achieve <1ps typical rms phase jitter, easily meeting Fibre  
Channel and Ethernet jitter requirements. The ICS844001I is  
packaged in a small 8-pin TSSOP, making it ideal for use in  
systems with limited board space.  
RMS phase jitter @ 106.25MHz, using a 26.5625MHz crystal  
(637kHz - 10MHz): 0.74ps (typical)  
3.3V or 2.5V operating supply  
-40°C to 85°C ambient operating temperature  
COMMON CONFIGURATION TABLE - FIBRE CHANNEL, 12Gb ETHERNET  
Inputs  
Output Frequency  
(MHz)  
Multiplication  
Value M/N  
Crystal Frequency (MHz) FREQ_SEL  
M
N
26.5625  
26.5625  
23.4375  
0
1
1
24  
24  
24  
6
3
3
4
8
8
106.25  
212.5  
187.5  
BLOCK DIAGRAM  
PIN ASSIGNMENT  
Pullup  
FREQ_SEL  
VDDA  
VDD  
1
2
3
4
8
7
6
5
GND  
XTAL_OUT  
XTAL_IN  
Q
1
0
nQ  
÷3  
÷6  
XTAL_IN  
Q
VCO  
FREQ_SEL  
Phase  
Detector  
OSC  
490MHz - 680MHz  
nQ  
XTAL_OUT  
ICS844001I  
8-Lead TSSOP  
4.40mm x 3.0mm x 0.925mm  
package body  
M = ÷24 (fixed)  
G Package  
TopView  
The Preliminary Information presented herein represents a product in prototyping or pre-production.The noted characteristics are based on initial  
product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.  
844001AGI  
www.icst.com/products/hiperclocks.html  
REV. A JUNE 16, 2005  
1

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