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ICS844246AM PDF预览

ICS844246AM

更新时间: 2024-11-06 11:14:43
品牌 Logo 应用领域
矽成 - ICSI 晶体外围集成电路光电二极管时钟
页数 文件大小 规格书
13页 186K
描述
FEMTOCLOCKS? CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER

ICS844246AM 数据手册

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PRELIMINARY  
ICS844246  
Integrated  
Circuit  
Systems, Inc.  
FEMTOCLOCKS™ C RYSTAL-TO-LVDS  
FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER  
GENERAL DESCRIPTION  
FEATURES  
The ICS844246 is a Crystal-to-LVDS Clock Six LVDS outputs  
ICS  
HiPerClockS™  
Synthesizer/Fanout Buffer designed for Fibre  
Crystal oscillator interface  
Channel and Gigabit Ethernet applications and  
is a member of the HiperClockS™ family of  
High Performance Clock Solutions from ICS.  
Output frequency range: 53.125MHz to 333.3333MHz  
Crystal input frequency range: 25MHz to 33.333MHz  
The output frequency can be set using the frequency  
select pins and a 25MHz crystal for Ethernet fre-  
quencies, or a 26.5625MHz crystal for a Fibre Channel.  
The low phase noise characteristics of the ICS844246  
make it an ideal clock for these demanding applications.  
RMS phase jitter at 125MHz, using a 25MHz crystal  
(1.875MHz to 20MHz): 0.39ps (typical)  
Full 3.3V or 3.3V core, 2.5V output supply mode  
0°C to 70°C ambient operating temperature  
Industrial temperature information available upon request  
Available in both standard and lead-free RoHS-compliant  
packages  
SELECT FUNCTION TABLE  
Inputs  
Function  
FB_SEL N_SEL1 N_SEL0 M Divide N Divide  
M/N  
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
20  
20  
20  
20  
24  
24  
24  
24  
2
4
10  
5
5
4
8
2.5  
8
3
4
6
6
4
12  
2
BLOCK DIAGRAM  
PIN ASSIGNMENT  
VDDO  
VDDO  
1
24  
23  
22  
21  
20  
19  
18  
Q3  
Q0  
2
nQ3  
3
nQ2  
Q4  
nQ0  
4
Q2  
nQ4  
Pullup  
PLL_BYPASS  
nQ1  
5
Q5  
Q1  
6
Q1  
nQ5  
7
8
9
10  
11  
12  
nQ0  
Q0  
PLL_BYPASS  
VDDA  
N_SEL1  
GND  
GND  
N_SEL0  
XTAL_OUT  
XTAL_IN  
1
0
nQ1  
17  
16  
15  
14  
13  
Output  
Divider  
XTAL_IN  
OSC  
PLL  
Q2  
VDD  
FB_SEL  
XTAL_OUT  
nQ2  
ICS843246  
24-Lead, 300-MIL SOIC  
7.5mm x 15.33mm x 2.3mm  
body package  
Q3  
Feedback  
Divider  
nQ3  
M Package  
TopView  
Pulldown  
FB_SEL  
Q4  
Pullup  
nQ4  
N_SEL1  
24-LeadTSSOP  
4.40mm x 7.8mm x 0.92mm  
body package  
Pullup  
N_SEL0  
Q5  
G Package  
TopView  
nQ5  
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.  
844246AM  
www.icst.com/products/hiperclocks.html  
REV.A SEPTEMBER 29, 2005  
1

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