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ICS841654I

更新时间: 2024-11-02 05:39:03
品牌 Logo 应用领域
艾迪悌 - IDT 时钟发生器
页数 文件大小 规格书
17页 326K
描述
FEMTOCLOCKS™ CRYSTAL-TO-HCSL CLOCK GENERATOR

ICS841654I 数据手册

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FEMTOCLOCKS™ CRYSTAL-TO-HCSL  
CLOCK GENERATOR  
ICS841654I  
GENERAL DESCRIPTION  
FEATURES  
The ICS841654I is an optimized PCIe and sRIO clock  
• Four differential HCSL clock outputs: configurable for PCIe  
(100MHz) and sRIO (100MHz or 125MHz) clock signals  
One REF_OUT LVCMOS/LVTTL clock output  
ICS  
HiPerClockS™  
generator and member of the HiPerClocksfamily  
of high-performance clock solutions from IDT. The  
device uses a 25MHz parallel crystal to generate  
100MHz and 125MHz clock signals, replacing  
• Selectable crystal oscillator interface, 25MHz, 18pF parallel  
resonant crystal or LVCMOS/LVTTL single-ended reference  
clock input  
solutions requiring multiple oscillator and fanout buffer solutions.  
The device has excellent phase jitter (< 1ps rms) suitable to clock  
components requiring precise and low-jitter PCIe or sRIO or both  
clock signals. Designed for telecom, networking and industrial  
applications, the ICS841654I can also drive the high-speed sRIO  
and PCIe SerDes clock inputs of communication processors,  
DSPs, switches and bridges.  
• Supports the following output frequencies:  
100MHz or 125MHz  
• VCO: 500MHz  
• PLL bypass and output enable  
• RMS phase jitter at 100MHz, using a 25MHz crystal  
(1.875MHz - 20MHz): 0.44ps (typical)  
• Full 3.3V power supply mode  
• -40°C to 85°C ambient operating temperature  
• Available in both standard (RoHS 5) and lead-free (RoHS 6)  
packages  
BLOCK DIAGRAM  
PIN ASSIGNMENT  
XTAL_IN  
VDD  
REF_OUT  
GND  
1
2
3
4
IREF  
28  
27  
26  
25  
QA0  
1
0
OSC  
FSEL0  
FSEL1  
QB0  
nQA0  
XTAL_OUT  
REF_IN  
FemtoClock  
QA0  
0
PLL  
÷NA  
Pulldown  
Pulldown  
VCO = 500MHz  
QA1  
nQA0  
VDDOA  
GND  
QA1  
nQA1  
24  
23  
22  
nQB0  
VDDOB  
GND  
QB1  
nQB1  
5
6
7
8
1
nQA1  
REF_SEL  
IREF  
21  
20  
19  
18  
17  
16  
15  
9
M = ÷20  
QB0  
MR/nOE  
VDD  
XTAL_IN  
XTAL_OUT  
GND  
10  
11  
12  
13  
nREF_OE  
BYPASS  
REF_IN  
REF_SEL  
nQB0  
÷NB  
QB1  
Pulldown  
Pulldown  
Pulldown  
BYPASS  
14  
VDDA  
nQB1  
FSEL[0:1]  
ICS841654I  
28-Lead TSSOP  
6.1mm x 9.7mm x 0.925mm  
package body  
MR/nOE  
REF_OUT  
G Package  
Top View  
Pullup  
nREF_OE  
IDT/ ICSHCSL CLOCK GENERATOR  
1
ICS841654AGI REV. A APRIL 17, 2008  

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